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skia / buildbot / 7ab1f7f12a95409ff8c9e37e94ad4091c929b97b / . / perf / modules / plot-simple-sk / plot-simple-sk.ts
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/**
* @module modules/plot-simple-sk
* @description <h2><code>plot-simple-sk</code></h2>
*
* A custom element for plotting x,y graphs.
*
* The canvas is broken into two areas, the summary and the details. The
* summary is always SUMMARY_HEIGHT pixels high. Also note that we use
* window.devicePixelRatio to decide the actual number of pixels to use, and
* then use CSS transform to squash the canvas back down to the desired size.
*
* +----------------------------------------------------+
* | |
* | MARGIN |
* | |
* | +--------------------------------------------+ |
* | | Summary | |
* | | | |
* | +--------------------------------------------+ |
* | |
* | MARGIN |
* | |
* | +--------------------------------------------+ |
* | | Details | |
* | | | |
* | | | |
* | | | |
* | | | |
* | | | |
* | | | |
* | | | |
* | +--------------------------------------------+ |
* | |
* | MARGIN |
* | |
* +----------------------------------------------------+
*
* To keep rendering quick the traces will be written into Path2D objects to be
* used for quick rendering.
*
* We also use a k-d Tree for quick lookup for clicking and mouse movement over
* the traces.
*
* There are actually two canvas's in play, the trace canvas is below the
* overlay canvas. The trace canvas contains all the traces in the summary and
* details along with their axes. The overlay canvas contains everything that
* changes quickly, such as the crosshairs, the x-bar, etc.
*
* This element knows about elements-sk/themes and uses those CSS variables if
* present.
*
* Listens for "theme-chooser-toggle" event on the document and redraws with
* updated computed style colors.
*
* @evt trace_selected - Event produced when the user clicks on a line. The
* e.detail contains the id of the line and the index of the point in the
* line closest to the mouse, and the [x, y] value of the point in 'pt'.
*
* <pre>
* {
* x: x,
* y: y,
* name: name,
* }
* </pre>
*
* @evt trace_focused - Event produced when the user moves the mouse close to a
* line. The e.detail contains the id of the line and the index of the point
* in the line closest to the mouse.
*
* <pre>
* {
* x: x,
* y: y,
* name: name,
* }
* </pre>
*
* @evt zoom - Event produced when the user has zoomed into a region by
* dragging. The detail is of the form:
*
* {
* xBegin: new Date(),
* xEnd: new Date(),
* }
*
* @attr width - The width of the element in px.
*
* @attr height - The height of the element in px.
*
* @attr summary {Boolean} - If present then display the summary bar.
*/
import { define } from 'elements-sk/define';
import { html } from 'lit-html';
import * as d3Scale from 'd3-scale';
import * as d3Array from 'd3-array';
import * as ResizeObserverPolyfill from 'resize-observer-polyfill';
// This import is needed because https://github.com/Microsoft/TypeScript/issues/28502
import ResizeObserver from 'resize-observer-polyfill';
import { ElementSk } from '../../../infra-sk/modules/ElementSk';
import { KDTree, KDPoint } from './kd';
import { ticks } from './ticks';
// Prefix for trace ids that are not real traces, such as special_zero. Special
// traces never receive focus and can't be clicked on.
const SPECIAL = 'special';
export const MISSING_DATA_SENTINEL = 1e32;
const NUM_Y_TICKS = 4;
const HOVER_COLOR = '#8887'; // Note the alpha value.
const ZOOM_RECT_COLOR = '#0007'; // Note the alpha value.
const SUMMARY_LINE_WIDTH = 1; // px
const DETAIL_LINE_WIDTH = 1; // px
const AXIS_LINE_WIDTH = 1; // px
const MIN_MOUSE_MOVE_FOR_ZOOM = 5; // px
// As backup use a Polyfill for ResizeObserver if it isn't supported. This can
// go away when Safari supports ResizeObserver:
// https://caniuse.com/#feat=resizeobserver
const LocalResizeObserver = ResizeObserver || ResizeObserverPolyfill;
/**
* @constant {Array} - Colors used for traces.
*/
const COLORS = [
'#000000',
'#1B9E77',
'#D95F02',
'#7570B3',
'#E7298A',
'#66A61E',
'#E6AB02',
'#A6761D',
'#666666',
];
// Contains linear scales to convert from source coordinates into
// device/destination coordinates.
export interface Range {
x: d3Scale.ScaleLinear<number, number>;
y: d3Scale.ScaleLinear<number, number>;
}
// A trace is drawn as a set of lines overdrawn with dots at each measurement.
interface TracePaths {
linePath: Path2D | null;
dotsPath: Path2D | null;
}
/** @class Builds the Path2D objects that describe the trace and the dots for a given
* set of scales.
*/
class PathBuilder {
// TODO(jcgregorio) Change to TracePaths.
private linePath: Path2D;
private dotsPath: Path2D;
// TODO(jcgregorio) Change to Range.
private xRange: d3Scale.ScaleLinear<number, number>;
private yRange: d3Scale.ScaleLinear<number, number>;
private radius: number;
constructor(
xRange: d3Scale.ScaleLinear<number, number>,
yRange: d3Scale.ScaleLinear<number, number>,
radius: number,
) {
this.xRange = xRange;
this.yRange = yRange;
this.radius = radius;
this.linePath = new Path2D();
this.dotsPath = new Path2D();
}
/**
* Add a point to plot to the path.
*
* @param {Number} x - X coordinate in source coordinates.
* @param {Number} y - Y coordinate in source coordinates.
*/
add(x: number, y: number) {
// Convert source coord into canvas coords.
const cx = this.xRange(x);
const cy = this.yRange(y);
if (x === 0) {
this.linePath.moveTo(cx, cy);
} else {
this.linePath.lineTo(cx, cy);
}
this.dotsPath.moveTo(cx + this.radius, cy);
this.dotsPath.arc(cx, cy, this.radius, 0, 2 * Math.PI);
}
/**
* Returns the Arrays of Path2D objects that represent all the traces.
*
* @returns {Object}
*/
paths(): TracePaths {
return {
linePath: this.linePath,
dotsPath: this.dotsPath,
};
}
}
interface Point {
x: number;
y: number;
}
const invalidPoint: Point = {
x: Number.MIN_SAFE_INTEGER,
y: Number.MIN_SAFE_INTEGER,
};
const pointIsValid = (p: Point): boolean => p.x !== invalidPoint.x;
interface Rect extends Point {
width: number;
height: number;
}
/**
* Convert rect in domain units into canvas coordinates using the given range.
*
* Presumes the rect was previously gotten from rectFromRangeInvert, so we don't
* need to flip top and bottom.
*/
export const rectFromRange = (range: Range, rect: Rect): Rect => {
const cleft = range.x(rect.x);
const ctop = range.y(rect.y);
const cright = range.x(rect.x + rect.width);
const cbottom = range.y(rect.y + rect.height);
return {
x: cleft,
y: ctop,
width: cright - cleft,
height: cbottom - ctop,
};
};
/**
* Convert rect in canvas units into domain units given the given range.
*
* Presumes this comes from a dragged out mouse region, which could be backwards
* and/or upside down, so corrections are done to the corners.
*/
export const rectFromRangeInvert = (range: Range, rect: Rect): Rect => {
let left = rect.x;
let top = rect.y;
let right = rect.x + rect.width;
let bottom = rect.y + rect.height;
if (right < left) {
[left, right] = [right, left];
}
// We do this backwards since range.y then does a second direction reversal,
// i.e. Canvas y-axis is in the opposite direction of the y-axis we use in
// the data units.
if (top < bottom) {
[bottom, top] = [top, bottom];
}
return {
x: range.x.invert(left),
y: range.y.invert(top),
width: range.x.invert(right) - range.x.invert(left),
height: range.y.invert(bottom) - range.y.invert(top),
};
};
const defaultRect: Rect = {
x: 0,
y: 0,
width: 0,
height: 0,
};
interface SearchPoint extends Point {
// Source coordinates.
sx: number;
sy: number;
name: string;
}
/**
* @class Builds a kdTree for searcing for nearest points to the mouse.
*/
class SearchBuilder {
// TODO(jcgregorio) Change to Range.
private xRange: d3Scale.ScaleLinear<number, number>;
private yRange: d3Scale.ScaleLinear<number, number>;
private points: SearchPoint[];
constructor(
xRange: d3Scale.ScaleLinear<number, number>,
yRange: d3Scale.ScaleLinear<number, number>,
) {
this.xRange = xRange;
this.yRange = yRange;
this.points = [];
}
/**
* Add a point to the kdTree.
*
* Note that add() stores the x and y coords as 'sx' and 'sy' in the KDTree nodes,
* and the canvas coords, which are computed from sx and sy are stored as 'x'
* and 'y' in the KDTree nodes.
*
* @param {Number} x - X coordinate in source coordinates.
* @param {Number} y - Y coordinate in source coordinates.
* @param {String} name - The trace name.
*/
add(x: number, y: number, name: string) {
if (name.startsWith(SPECIAL)) {
return;
}
// Convert source coord into canvas coords.
const cx = this.xRange(x);
const cy = this.yRange(y);
this.points.push({
x: cx,
y: cy,
sx: x,
sy: y,
name,
});
}
/**
* Returns a kdTree that contains all the points being plotted.
*
* @returns {KDTree}
*/
kdTree() {
const distance = (a: KDPoint, b: KDPoint) => {
const dx = a.x - b.x;
const dy = a.y - b.y;
return dx * dx + dy * dy;
};
return new KDTree(this.points, distance, ['x', 'y']);
}
}
// Returns true if pt is in rect.
function inRect(pt: Point, rect: Rect): boolean {
return (
pt.x >= rect.x
&& pt.x < rect.x + rect.width
&& pt.y >= rect.y
&& pt.y < rect.y + rect.height
);
}
// Restricts pt to rect.
function clampToRect(pt: Point, rect: Rect) {
if (pt.x < rect.x) {
pt.x = rect.x;
} else if (pt.x > rect.x + rect.width) {
pt.x = rect.x + rect.width;
}
if (pt.y < rect.y) {
pt.y = rect.y;
} else if (pt.y > rect.y + rect.height) {
pt.y = rect.y + rect.height;
}
}
// Clip the given Canvas2D context to the given rect.
function clipToRect(ctx: CanvasRenderingContext2D, rect: Rect) {
ctx.beginPath();
ctx.rect(rect.x, rect.y, rect.width, rect.height);
ctx.clip();
}
// All the data for a single trace.
interface LineData {
name: string;
values: number[];
color: string;
detail: TracePaths;
summary: TracePaths;
}
interface MousePosition {
clientX: number;
clientY: number;
}
interface MouseMoveRaw extends MousePosition {
// Is the shift key being pressed as the mouse moves.
shiftKey: boolean;
}
interface HoverPoint extends Point {
// The trace id.
name: string;
}
interface Label extends Point {
// The text value of the label.
text: string;
}
interface CrosshairPoint extends Point {
shift: boolean;
}
// Common information for both the Summary and Detail display areas.
interface Area {
rect: Rect;
axis: {
path: Path2D;
labels: Label[];
};
range: Range;
}
type SummaryArea = Area
interface DetailArea extends Area {
yaxis: {
path: Path2D;
labels: Label[];
};
}
// Describes the zoom in terms of x-axis source values.
type ZoomRange = [number, number] | null;
// Used for both the trace_selected and trace_focused events.
export interface PlotSimpleSkTraceEventDetails {
x: number;
y: number;
// The trace id.
name: string;
}
export interface PlotSimpleSkZoomEventDetails {
xBegin: Date;
xEnd: Date;
}
/**
* The type of zoom being done, or 'no-zoom' if no zoom is currently being done.
*/
export type ZoomDragType = 'no-zoom' | 'details' | 'summary'
export class PlotSimpleSk extends ElementSk {
/** The location of the XBar. See the xbar property. */
private _xbar: number = -1;
/** If true then draw dots on the traces. */
private _dots: boolean = true;
/** The locations of the background bands. See bands property. */
private _bands: number[] = [];
/** A map of trace names to 'true' of traces that are highlighted. */
private highlighted: { [key: string]: boolean } = {};
/**
* The data we are plotting.
* An array of objects of this form:
*
* {
* name: key,
* values: [1.0, 1.1, 0.9, ...],
* detail: {
* linePath: Path2D,
* dotsPath: Path2D,
* },
* summary: {
* linePath: Path2D,
* dotsPath: Path2D,
* },
* }
*/
private lineData: LineData[] = [];
/** An array of Date()'s the same length as the values in lineData. */
private labels: Date[] = [];
/**
* The current zoom, either null or an array of two values in source x
* coordinates, e.g. [1, 12].
*/
private _zoom: ZoomRange = null;
/** The source coordinate where a zoom started. */
private zoomBegin: number = 0;
/** The zoom rectangle on the details region. Stored in destination units. */
private zoomRect: Rect = defaultRect;
/**
* detailsZoomRangesStack and inactiveZoomRangesStack work together to manage
* a stack of zoom levels. As new zoom ranges are dragged out they are pushed
* onto detailsZoomRangesStack, and as the mouse wheel is turned we push/pop
* zoom ranges between detailsZoomRangesStack and inactiveZoomRangesStack.
* Scroll up means to zoom in, so we pop a rect off the inactive stack and
* push it on the active stack. Scrolling down means to zoom out, so we do the
* reverse, pop of the active stack and push it onto the inactive stack.
*
* When plotting we only look at the top of the active stack, i.e. the end of
* detailsZoomRangesStack.
*
* detailsZoomRangesStack is a stack of zoom ranges, each zoom range in the
* stack represents a smaller area than the zoom range below it on the stack.
* Zoom ranges are stored in domain units.
*/
private detailsZoomRangesStack: Rect[] = [];
/**
* As we use the mouse wheel to move through zooms we store the ones we've
* popped off of detailsZoomRangesStack here.
*
* Zoom ranges are stored in domain units.
*/
private inactiveDetailsZoomRangesStack: Rect[] = [];
/**
* True if we are currently drag zooming, i.e. the mouse is pressed and moving
* over the summary.
*/
private inZoomDrag: ZoomDragType = 'no-zoom';
/** The Canvas 2D context of the traces canvas. */
private ctx: CanvasRenderingContext2D | null = null;
/** The Canvas 2D context of the overlay canvas. */
private overlayCtx: CanvasRenderingContext2D | null = null;
/** The window.devicePixelRatio. */
private scale: number = 1.0;
/**
* A copy of the clientX, clientY, and shiftKey values of mousemove events,
* or null if a mousemove event hasn't occurred since the last time it was
* processed.
*/
private mouseMoveRaw: MouseMoveRaw | null = null;
/**
* A kdTree for all the points being displayed, in source coordinates. Is
* null if no traces are being displayed.
*/
private pointSearch: KDTree<SearchPoint> | null = null;
/**
* The closest trace point to the mouse. May be {} if no traces are
* displayed or the mouse hasn't moved over the canvas yet. Has the form:
* {
* x: x,
* y: y,
* name: String, // name of trace
* }
*/
private hoverPt: HoverPoint = {
x: -1,
y: -1,
name: '',
};
/**
* The location of the crosshair in canvas coordinates. Of the form:
* {
* x: x,
* y: y,
* shift: Boolean,
* }
*
* The value of shift is true of the shift key is being pressed while the
* mouse moves.
* }
*/
private crosshair: CrosshairPoint = {
x: -1,
y: -1,
shift: false,
};
/** All the info we need about the summary area. */
private summaryArea: SummaryArea = {
rect: {
x: 0,
y: 0,
width: 0,
height: 0,
},
axis: {
path: new Path2D(), // Path2D.
labels: [], // The labels and locations to draw them. {x, y, text}.
},
range: {
x: d3Scale.scaleLinear(),
y: d3Scale.scaleLinear(),
},
};
/** All the info we need about the details area. */
private detailArea: DetailArea = {
rect: {
x: 0,
y: 0,
width: 0,
height: 0,
},
axis: {
path: new Path2D(), // Path2D.
labels: [], // The labels and locations to draw them. {x, y, text}.
},
yaxis: {
path: new Path2D(),
labels: [], // The labels and locations to draw them. {x, y, text}.
},
range: {
x: d3Scale.scaleLinear(),
y: d3Scale.scaleLinear(),
},
};
/**
* A task to rebuild the k-d search tree used for finding the closest point
* to the mouse. The actual value is a window.setTimer timerId or zero if no
* task is scheduled.
*
* See https://jakearchibald.com/2015/tasks-microtasks-queues-and-schedules/
* for details on tasks vs microtasks.
*/
private recalcSearchTask: number = 0;
/**
* A task to do the actual re-draw work of a zoom. The actual value is a
* window.setTimer timerId or zero if no task is scheduled.
*
* See https://jakearchibald.com/2015/tasks-microtasks-queues-and-schedules/
* for details on tasks vs microtasks.
*/
private zoomTask: number = 0;
/**
* A formatter that prints numbers nicely, such as adding commas. Used when
* display the hover text.
*/
private numberFormatter: Intl.NumberFormat = new Intl.NumberFormat();
private SUMMARY_HEIGHT!: number; // px
private SUMMARY_BAR_WIDTH!: number; // px
private DETAIL_BAR_WIDTH!: number; // px
private SUMMARY_HIGHLIGHT_LINE_WIDTH!: number; // px
private DETAIL_RADIUS!: number; // px
private SUMMARY_RADIUS!: number; // The radius of points in the summary area. (px)
private MARGIN!: number; // The margin around the details and summary areas. (px)
private LEFT_MARGIN!: number; // px
private Y_AXIS_TICK_LENGTH!: number; // px
private LABEL_FONT_SIZE!: number; // px
private LABEL_MARGIN!: number; // px
private LABEL_FONT!: string; // CSS font string.
private ZOOM_BAR_LINE_WIDTH!: number; // px
private HOVER_LINE_WIDTH!: number; // px
private LABEL_COLOR!: string; // CSS color.
private LABEL_BACKGROUND!: string; // CSS color.
private CROSSHAIR_COLOR!: string; // CSS color.
private BAND_COLOR!: string; // CSS color.
constructor() {
super(PlotSimpleSk.template);
this._upgradeProperty('width');
this._upgradeProperty('height');
this._upgradeProperty('bands');
this._upgradeProperty('xbar');
this._upgradeProperty('hightlight');
this._upgradeProperty('zoom');
this.updateScaledMeasurements();
}
// Note that in both of the canvas elements we are setting a CSS transform that
// takes into account window.devicePixelRatio, that is, we are drawing to a
// scale that matches the displays native resolution and then scaling that back
// to fit on the page. Also see updateScaledMeasurements for how the device
// pixel ratio affects all of our pixel calculations.
private static template = (ele: PlotSimpleSk) => html`
<canvas
class="traces"
width=${ele.width * window.devicePixelRatio}
height=${ele.height * window.devicePixelRatio}
style="transform-origin: 0 0; transform: scale(${1
/ window.devicePixelRatio});"
></canvas>
<canvas
class="overlay"
width=${ele.width * window.devicePixelRatio}
height=${ele.height * window.devicePixelRatio}
style="transform-origin: 0 0; transform: scale(${1
/ window.devicePixelRatio});"
></canvas>
`;
connectedCallback(): void {
super.connectedCallback();
this.render();
// We need to dynamically resize the canvas elements since they don't do
// that themselves.
const resizeObserver = new LocalResizeObserver((entries: ResizeObserverEntry[]) => {
entries.forEach((entry) => {
this.width = entry.contentRect.width;
});
});
resizeObserver.observe(this);
this.addEventListener('mousemove', (e) => {
// Do as little as possible here. The raf() function will periodically
// check if the mouse has moved and trigger the appropriate redraws.
this.mouseMoveRaw = {
clientX: e.clientX,
clientY: e.clientY,
shiftKey: e.shiftKey,
};
});
this.addEventListener('mousedown', (e) => {
const pt = this.eventToCanvasPt(e);
// If you click in the summary area then begin zooming via drag.
if (inRect(pt, this.summaryArea.rect!)) {
const zx = this.summaryArea.range.x.invert(pt.x);
this.inZoomDrag = 'summary';
this.zoomBegin = zx;
this.zoom = [zx, zx + 0.01]; // Add a smidge to the second zx to avoid a degenerate detail plot.
// Zooming via the summary area clears all details area zooms.
this.detailsZoomRangesStack = [];
this.inactiveDetailsZoomRangesStack = [];
}
if (inRect(pt, this.detailArea.rect!)) {
this.inZoomDrag = 'details';
this.zoomRect = {
x: pt.x,
y: pt.y,
width: 0,
height: 0,
};
}
});
this.addEventListener('mouseup', () => {
if (this.inZoomDrag !== 'no-zoom') {
this.dispatchZoomEvent();
}
if (this.inZoomDrag === 'details') {
this.doDetailsZoom();
}
this.inZoomDrag = 'no-zoom';
});
this.addEventListener('mouseleave', () => {
if (this.inZoomDrag !== 'no-zoom') {
this.dispatchZoomEvent();
}
if (this.inZoomDrag === 'details') {
this.doDetailsZoom();
}
this.inZoomDrag = 'no-zoom';
});
this.addEventListener('wheel', (e: WheelEvent) => {
e.stopPropagation();
e.preventDefault();
// If the wheel is spun while we are zoomed then move through the stack of
// zoom ranges.
if (this.detailsZoomRangesStack) {
// Scrolling up on the scroll wheel gives e.deltaY a negative value. Up
// means to scroll in, which means we want to take a rect from
// inactiveDetailsZoomRangesStack and make it active by pushing it on
// detailsZoomRangesStack. Down reverses the push/pop direction.
if (e.deltaY < 0) {
if (this.inactiveDetailsZoomRangesStack.length === 0) {
return;
}
this.detailsZoomRangesStack.push(this.inactiveDetailsZoomRangesStack.pop()!);
} else {
if (this.detailsZoomRangesStack.length === 0) {
return;
}
this.inactiveDetailsZoomRangesStack.push(this.detailsZoomRangesStack.pop()!);
}
this._zoomImpl();
}
});
this.addEventListener('click', (e) => {
const pt = this.eventToCanvasPt(e);
if (!inRect(pt, this.detailArea.rect)) {
return;
}
if (!this.pointSearch) {
return;
}
const closest = this.pointSearch.nearest(pt);
const detail = {
x: closest.sx,
y: closest.sy,
name: closest.name,
};
this.dispatchEvent(
new CustomEvent<PlotSimpleSkTraceEventDetails>('trace_selected', {
detail,
bubbles: true,
}),
);
});
// If the user toggles the theme to/from darkmode then redraw.
document.addEventListener('theme-chooser-toggle', () => {
this.render();
});
window.requestAnimationFrame(this.raf.bind(this));
}
attributeChangedCallback(_: string, oldValue: string, newValue: string): void {
if (oldValue !== newValue) {
this.render();
}
}
// Call this when the width or height attrs have changed.
render(): void {
this._render();
const canvas = this.querySelector<HTMLCanvasElement>('canvas.traces')!;
const overlayCanvas = this.querySelector<HTMLCanvasElement>(
'canvas.overlay',
)!;
if (canvas) {
this.ctx = canvas.getContext('2d');
this.overlayCtx = overlayCanvas.getContext('2d');
this.scale = window.devicePixelRatio;
this.updateScaledMeasurements();
this.updateScaleRanges();
this.recalcDetailPaths();
this.recalcSummaryPaths();
this.drawTracesCanvas();
}
}
/**
* Adds lines to be displayed.
*
* Any line id that begins with 'special' will be treated specially,
* i.e. it will be presented as a dashed black line that doesn't
* generate events. This may be useful for adding a line at y=0,
* or a reference trace.
*
* @param {Object} lines - A map from trace id to arrays of y values.
* @param {Array} labels - An array of Date objects the same length as the values.
*
*/
addLines(lines: { [key: string]: number[] | null }, labels: Date[]): void {
const keys = Object.keys(lines);
if (keys.length === 0) {
return;
}
const startedEmpty = this._zoom === null && this.lineData.length === 0;
if (labels) {
this.labels = labels;
}
// Convert into the format we will eventually expect.
keys.forEach((key) => {
// You can't encode NaN in JSON, so convert sentinel values to NaN here so
// that dsArray functions will operate correctly.
lines[key]!.forEach((x, i) => {
if (x === MISSING_DATA_SENTINEL) {
lines[key]![i] = NaN;
}
});
const values = lines[key]!;
this.lineData.push({
name: key,
values,
color: 'black',
detail: {
linePath: null,
dotsPath: null,
},
summary: {
linePath: null,
dotsPath: null,
},
});
});
// Set the zoom if we just added data for the first time.
if (startedEmpty && this.lineData.length > 0) {
this._zoom = [0, this.lineData[0].values.length - 1];
}
this.updateScaleDomains();
this.recalcSummaryPaths();
this.recalcDetailPaths();
this.drawTracesCanvas();
}
/**
* Delete all the lines whose ids are in 'ids' from being plotted.
*
* @param {Array<string>} ids - The trace ids to remove.
*/
deleteLines(ids: string[]): void {
this.lineData = this.lineData.filter(
(line) => ids.indexOf(line.name) === -1,
);
const onlySpecialLinesRemaining = this.lineData.every((line) => line.name.startsWith(SPECIAL));
if (onlySpecialLinesRemaining) {
this.removeAll();
} else {
this.updateScaleDomains();
this.recalcSummaryPaths();
this.recalcDetailPaths();
this.drawTracesCanvas();
}
}
/**
* Remove all lines from plot.
*/
removeAll(): void {
this.lineData = [];
this.labels = [];
this.hoverPt = {
x: -1,
y: -1,
name: '',
};
this.pointSearch = null;
this.crosshair = {
x: -1,
y: -1,
shift: false,
};
this.mouseMoveRaw = null;
this.highlighted = {};
this._xbar = -1;
this._zoom = null;
this.inZoomDrag = 'no-zoom';
this.detailsZoomRangesStack = [];
this.inactiveDetailsZoomRangesStack = [];
this.drawTracesCanvas();
}
/**
* Return the names of all the lines being plotted, not including SPECIAL
* names.
* */
getLineNames(): string[] {
const ret: string[] = [];
this.lineData.forEach((line) => {
if (line.name.startsWith(SPECIAL)) {
return;
}
ret.push(line.name);
});
return ret;
}
/**
* Update all the things that look like constants, but are really dependent on
* window.devicePixelRatio or the current CSS styling.
*/
private updateScaledMeasurements() {
// The height of the summary area.
if (this.summary) {
this.SUMMARY_HEIGHT = 50 * this.scale; // px
} else {
this.SUMMARY_HEIGHT = 0;
}
this.SUMMARY_BAR_WIDTH = 2 * this.scale; // px
this.DETAIL_BAR_WIDTH = 3 * this.scale; // px
this.SUMMARY_HIGHLIGHT_LINE_WIDTH = 3 * this.scale;
// The radius of points in the details area.
this.DETAIL_RADIUS = 3 * this.scale; // px
// The radius of points in the summary area.
this.SUMMARY_RADIUS = 2 * this.scale; // px
// The margin around the details and summary areas.
this.MARGIN = 32 * this.scale; // px
this.LEFT_MARGIN = 2 * this.MARGIN; // px
this.Y_AXIS_TICK_LENGTH = this.MARGIN / 4; // px
this.LABEL_FONT_SIZE = 14 * this.scale; // px
this.LABEL_MARGIN = 6 * this.scale; // px
this.LABEL_FONT = `${this.LABEL_FONT_SIZE}px Roboto,Helvetica,Arial,Bitstream Vera Sans,sans-serif`;
this.ZOOM_BAR_LINE_WIDTH = 3 * this.scale; // px
this.HOVER_LINE_WIDTH = 1 * this.scale; // px
this.CROSSHAIR_COLOR = '#f00';
this.BAND_COLOR = '#888';
// Pull out the computed colors.
const style = getComputedStyle(this);
// Start by using the computed colors.
this.LABEL_COLOR = style.color;
this.LABEL_BACKGROUND = style.backgroundColor;
// Now override with CSS variables if they are present.
const onBackground = style.getPropertyValue('--on-backgroud');
if (onBackground !== '') {
this.LABEL_COLOR = onBackground;
}
const background = style.getPropertyValue('--backgroud');
if (background !== '') {
this.LABEL_BACKGROUND = background;
}
const errorColor = style.getPropertyValue('--error');
if (errorColor !== '') {
this.CROSSHAIR_COLOR = errorColor;
}
const secondaryColor = style.getPropertyValue('--secondary');
if (secondaryColor !== '') {
this.BAND_COLOR = secondaryColor;
}
}
private dispatchZoomEvent() {
if (!this._zoom) {
return;
}
let beginIndex = Math.floor(this._zoom[0] - 0.1);
if (beginIndex < 0) {
beginIndex = 0;
}
let endIndex = Math.ceil(this._zoom[1] + 0.1);
if (endIndex > this.labels.length - 1) {
endIndex = this.labels.length - 1;
}
const detail = {
xBegin: this.labels[beginIndex],
xEnd: this.labels[endIndex],
};
this.dispatchEvent(
new CustomEvent<PlotSimpleSkZoomEventDetails>('zoom', {
detail,
bubbles: true,
}),
);
}
/**
* Convert mouse event coordinates to a canvas point.
*
* @param {Object} e - A mouse event or an object that has the coords stored
* in clientX and clientY.
*/
private eventToCanvasPt(e: MouseMoveRaw) {
const clientRect = this.ctx!.canvas.getBoundingClientRect();
return {
x: (e.clientX - clientRect.left) * this.scale,
y: (e.clientY - clientRect.top) * this.scale,
};
}
// Handles requestAnimationFrame callbacks.
private raf() {
// Always queue up our next raf first.
window.requestAnimationFrame(() => this.raf());
// Bail out early if the mouse hasn't moved.
if (this.mouseMoveRaw === null) {
return;
}
if (this.inZoomDrag === 'no-zoom') {
const pt = this.eventToCanvasPt(this.mouseMoveRaw);
// Update _hoverPt if needed.
if (this.pointSearch) {
const closest = this.pointSearch.nearest(pt);
const detail = {
x: closest.sx,
y: closest.sy,
name: closest.name,
};
if (detail.x !== this.hoverPt.x || detail.y !== this.hoverPt.y) {
this.hoverPt = detail;
this.dispatchEvent(
new CustomEvent<PlotSimpleSkTraceEventDetails>('trace_focused', {
detail,
bubbles: true,
}),
);
}
}
// Update crosshair.
if (this.mouseMoveRaw.shiftKey && this.pointSearch) {
this.crosshair = {
x: pt.x,
y: pt.y,
shift: false,
};
clampToRect(this.crosshair, this.detailArea.rect);
} else {
this.crosshair = {
x: this.detailArea.range.x(this.hoverPt.x),
y: this.detailArea.range.y(this.hoverPt.y),
shift: true,
};
}
this.drawOverlayCanvas();
} else {
// We are zooming.
const pt = this.eventToCanvasPt(this.mouseMoveRaw);
if (this.inZoomDrag === 'summary') {
clampToRect(pt, this.summaryArea.rect);
// x in source coordinates.
const sx = this.summaryArea.range.x.invert(pt.x);
// Set zoom, always making sure we go from lowest to highest.
let zoom: ZoomRange = [this.zoomBegin, sx];
if (this.zoomBegin > sx) {
zoom = [sx, this.zoomBegin];
}
this.zoom = zoom;
} else if (this.inZoomDrag === 'details') {
clampToRect(pt, this.detailArea.rect);
this.zoomRect.width = pt.x - this.zoomRect.x;
this.zoomRect.height = pt.y - this.zoomRect.y;
this.drawOverlayCanvas();
}
this.mouseMoveRaw = null;
}
}
/**
* This is a super simple hash (h = h * 31 + x_i) currently used
* for things like assigning colors to graphs based on trace ids. It
* shouldn't be used for anything more serious than that.
*
* @param {String} s - A string to hash.
* @return {Number} A 32 bit hash for the given string.
*/
private hashString(s: string) {
let hash = 0;
for (let i = s.length - 1; i >= 0; i--) {
// eslint-disable-next-line no-bitwise
hash = (hash << 5) - hash + s.charCodeAt(i);
// eslint-disable-next-line no-bitwise
hash |= 0;
}
return Math.abs(hash);
}
// Rebuilds our cache of Path2D objects we use for quick rendering.
private recalcSummaryPaths() {
this.lineData.forEach((line) => {
// Need to pass in the x and y ranges, and the dot radius.
if (line.name.startsWith(SPECIAL)) {
line.color = this.LABEL_COLOR;
} else {
line.color = COLORS[(this.hashString(line.name) % 8) + 1];
}
const summaryBuilder = new PathBuilder(
this.summaryArea.range.x,
this.summaryArea.range.y,
this.SUMMARY_RADIUS,
);
line.values.forEach((y, x) => {
if (Number.isNaN(y)) {
return;
}
summaryBuilder.add(x, y);
});
line.summary = summaryBuilder.paths();
});
// Build summary x-axis.
this.recalcXAxis(this.summaryArea, this.labels, 0);
}
// Rebuilds our cache of Path2D objects we use for quick rendering.
private recalcDetailPaths() {
const domain = this.detailArea.range.x.domain();
domain[0] = Math.floor(domain[0] - 0.1);
domain[1] = Math.ceil(domain[1] + 0.1);
this.lineData.forEach((line) => {
// Need to pass in the x and y ranges, and the dot radius.
if (line.name.startsWith(SPECIAL)) {
line.color = this.LABEL_COLOR;
} else {
line.color = COLORS[(this.hashString(line.name) % 8) + 1];
}
const detailBuilder = new PathBuilder(
this.detailArea.range.x,
this.detailArea.range.y,
this.DETAIL_RADIUS,
);
let previousPoint: Point = invalidPoint;
let addedPointFromBeforeTheDomain = false;
let addedPointFromAfterTheDomain = false;
line.values.forEach((y, x) => {
if (Number.isNaN(y)) {
return;
}
// Always add in one point after the domain so we draw all visible line
// segments.
if (x > domain[1] && !addedPointFromAfterTheDomain) {
detailBuilder.add(x, y);
addedPointFromAfterTheDomain = true;
return;
}
if (x < domain[0] || x > domain[1]) {
previousPoint = { x: x, y: y };
return;
}
// Always add in one point before the domain so we draw all visible line
// segments.
if (!addedPointFromBeforeTheDomain) {
if (pointIsValid(previousPoint)) {
detailBuilder.add(previousPoint.x, previousPoint.y);
}
addedPointFromBeforeTheDomain = true;
}
detailBuilder.add(x, y);
});
line.detail = detailBuilder.paths();
});
// Build detail x-axis.
const detailDomain = this.detailArea.range.x.domain();
const labelOffset = Math.ceil(detailDomain[0]);
const detailLabels = this.labels.slice(
Math.ceil(detailDomain[0]),
Math.floor(detailDomain[1] + 1),
);
this.recalcXAxis(this.detailArea, detailLabels, labelOffset);
// Build detail y-axis.
this.recalcYAxis(this.detailArea);
this.recalcSearch();
}
// Recalculates the y-axis info.
private recalcYAxis(area: DetailArea) {
const yAxisPath = new Path2D();
const thinX = Math.floor(this.detailArea.rect.x) + 0.5; // Make sure we get a thin line. https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors#A_lineWidth_example
yAxisPath.moveTo(thinX, this.detailArea.rect.y);
yAxisPath.lineTo(thinX, this.detailArea.rect.y + this.detailArea.rect.height);
area.yaxis.labels = [];
area.range.y.ticks(NUM_Y_TICKS).forEach((t) => {
const label = {
x: 0,
y: Math.floor(area.range.y(t)) + 0.5,
text: `${this.numberFormatter.format(t)}`,
};
area.yaxis.labels.push(label);
yAxisPath.moveTo(thinX, label.y);
yAxisPath.lineTo(thinX - this.Y_AXIS_TICK_LENGTH, label.y);
});
area.yaxis.path = yAxisPath;
}
// Recalculates the x-axis info.
private recalcXAxis(area: Area, labels: Date[], labelOffset: number) {
const xAxisPath = new Path2D();
const thinY = Math.floor(area.rect.y) + 0.5; // Make sure we get a thin line.
xAxisPath.moveTo(area.rect.x + 0.5, thinY);
xAxisPath.lineTo(area.rect.x + 0.5 + area.rect.width, thinY);
area.axis.labels = [];
ticks(labels).forEach((tick) => {
const label = {
x: Math.floor(area.range.x(tick.x + labelOffset)) + 0.5,
y: area.rect.y - this.MARGIN / 2,
text: tick.text,
};
area.axis.labels.push(label);
xAxisPath.moveTo(label.x, area.rect.y);
xAxisPath.lineTo(label.x, area.rect.y - this.MARGIN / 2);
});
area.axis.path = xAxisPath;
}
// Rebuilds the kdTree we use to look up closest points.
private recalcSearch() {
if (this.recalcSearchTask) {
return;
}
this.recalcSearchTask = window.setTimeout(() => this.recalcSearchImpl());
}
private recalcSearchImpl() {
if (this.zoomTask) {
// If there is a pending zoom task then let that complete first since zooming
// invalidates the search tree and it needs to be built again.
this.recalcSearchTask = window.setTimeout(() => this.recalcSearchImpl());
return;
}
const domain = this.detailArea.range.x.domain();
domain[0] = Math.floor(domain[0] - 0.1);
domain[1] = Math.ceil(domain[1] + 0.1);
const searchBuilder = new SearchBuilder(
this.detailArea.range.x,
this.detailArea.range.y,
);
this.lineData.forEach((line) => {
line.values.forEach((y, x) => {
if (Number.isNaN(y)) {
return;
}
if (x < domain[0] || x > domain[1]) {
return;
}
searchBuilder.add(x, y, line.name);
});
});
this.pointSearch = searchBuilder.kdTree();
this.recalcSearchTask = 0;
}
// Updates all of our d3Scale domains.
private updateScaleDomains() {
let domainEnd = 1;
if (this.lineData && this.lineData.length) {
domainEnd = this.lineData[0].values.length - 1;
}
if (this._zoom) {
this.detailArea.range.x = this.detailArea.range.x.domain(this._zoom);
} else {
this.detailArea.range.x = this.detailArea.range.x.domain([0, domainEnd]);
}
this.summaryArea.range.x = this.summaryArea.range.x.domain([0, domainEnd]);
const domain = [
d3Array.min(this.lineData, (line) => d3Array.min(line.values))!,
d3Array.max(this.lineData, (line) => d3Array.max(line.values))!,
];
this.detailArea.range.y = this.detailArea.range.y.domain(domain).nice();
this.summaryArea.range.y = this.summaryArea.range.y.domain(domain);
// If detailsZoomRangeStacks is not empty then it overrides the detail
// range.
if (this.detailsZoomRangesStack.length > 0) {
const zoom = this.detailsZoomRangesStack[this.detailsZoomRangesStack.length - 1];
this.detailArea.range.x = this.detailArea.range.x.domain([zoom.x, zoom.x + zoom.width]);
this.detailArea.range.y = this.detailArea.range.y.domain([zoom.y, zoom.y + zoom.height]);
}
}
// Updates all of our d3Scale ranges. Also updates detail and summary rects.
private updateScaleRanges() {
const width = this.ctx!.canvas.width;
const height = this.ctx!.canvas.height;
this.summaryArea.range.x = this.summaryArea.range.x.range([
this.LEFT_MARGIN,
width - this.MARGIN,
]);
this.summaryArea.range.y = this.summaryArea.range.y.range([
this.SUMMARY_HEIGHT + this.MARGIN,
this.MARGIN,
]);
this.detailArea.range.x = this.detailArea.range.x.range([
this.LEFT_MARGIN,
width - this.MARGIN,
]);
this.detailArea.range.y = this.detailArea.range.y.range([
height - this.MARGIN,
this.SUMMARY_HEIGHT + 2 * this.MARGIN,
]);
this.summaryArea.rect = {
x: this.LEFT_MARGIN,
y: this.MARGIN,
width: width - this.MARGIN - this.LEFT_MARGIN,
height: this.SUMMARY_HEIGHT,
};
this.detailArea.rect = {
x: this.LEFT_MARGIN,
y: this.SUMMARY_HEIGHT + 2 * this.MARGIN,
width: width - this.MARGIN - this.LEFT_MARGIN,
height: height - this.SUMMARY_HEIGHT - 3 * this.MARGIN,
};
}
private doDetailsZoom() {
// Don't actually do the zoom if the box isn't big enough.
if (
Math.abs(this.zoomRect.width) < MIN_MOUSE_MOVE_FOR_ZOOM
|| Math.abs(this.zoomRect.height) < MIN_MOUSE_MOVE_FOR_ZOOM
) {
return;
}
this.detailsZoomRangesStack.push(
rectFromRangeInvert(this.detailArea.range, this.zoomRect),
);
// We added a new zoom range, which means all the inactive zoom ranges are
// no longer valid.
this.inactiveDetailsZoomRangesStack = [];
this.inZoomDrag = 'no-zoom';
this._zoomImpl();
}
// Draw the contents of the overlay canvas.
private drawOverlayCanvas() {
// Always start by clearing the overlay.
const width = this.overlayCtx!.canvas.width;
const height = this.overlayCtx!.canvas.height;
const ctx = this.overlayCtx!;
ctx.clearRect(0, 0, width, height);
if (this.summary) {
// First clip to the summary region.
ctx.save();
{
// Block to scope save/restore.
clipToRect(ctx, this.summaryArea.rect);
// Draw the xbar.
this.drawXBar(ctx, this.summaryArea, this.SUMMARY_BAR_WIDTH);
// Draw the bands.
this.drawBands(ctx, this.summaryArea, this.SUMMARY_BAR_WIDTH);
// If detailsZoomRangeStacks is not empty then draw a box to indicate
// the zoomed region.
if (this.detailsZoomRangesStack.length > 0) {
const zoom = this.detailsZoomRangesStack[this.detailsZoomRangesStack.length - 1];
this.drawZoomRect(ctx, rectFromRange(this.summaryArea.range, zoom));
}
// Draw the zoom on the summary.
if (this._zoom !== null) {
ctx.lineWidth = this.ZOOM_BAR_LINE_WIDTH;
ctx.strokeStyle = this.LABEL_COLOR;
// Draw left bar.
const leftx = this.summaryArea.range.x(this._zoom[0]);
ctx.beginPath();
ctx.moveTo(leftx, this.summaryArea.rect.y);
ctx.lineTo(leftx, this.summaryArea.rect.y + this.summaryArea.rect.height);
// Draw right bar.
const rightx = this.summaryArea.range.x(this._zoom[1]);
ctx.moveTo(rightx, this.summaryArea.rect.y);
ctx.lineTo(rightx, this.summaryArea.rect.y + this.summaryArea.rect.height);
ctx.stroke();
// Draw gray boxes.
ctx.fillStyle = ZOOM_RECT_COLOR;
ctx.rect(
this.summaryArea.rect.x,
this.summaryArea.rect.y,
leftx - this.summaryArea.rect.x,
this.summaryArea.rect.height,
);
ctx.rect(
rightx,
this.summaryArea.rect.y,
this.summaryArea.rect.x + this.summaryArea.rect.width - rightx,
this.summaryArea.rect.height,
);
ctx.fill();
}
}
ctx.restore();
}
// Now clip to the detail region.
ctx.save();
{
// Block to scope save/restore.
clipToRect(ctx, this.detailArea.rect);
// Draw the xbar.
this.drawXBar(ctx, this.detailArea, this.DETAIL_BAR_WIDTH);
// Draw the bands.
this.drawBands(ctx, this.detailArea, this.DETAIL_BAR_WIDTH);
// Draw highlighted lines.
this.lineData.forEach((highlightedLine) => {
if (!(highlightedLine.name in this.highlighted)) {
return;
}
ctx.strokeStyle = highlightedLine.color;
ctx.fillStyle = this.LABEL_BACKGROUND;
ctx.lineWidth = this.SUMMARY_HIGHLIGHT_LINE_WIDTH;
ctx.stroke(highlightedLine.detail.linePath!);
if (this.dots) {
ctx.fill(highlightedLine.detail.dotsPath!);
ctx.stroke(highlightedLine.detail.dotsPath!);
}
});
// Find the line currently hovered over.
let line = null;
for (let i = 0; i < this.lineData.length; i++) {
if (this.lineData[i].name === this.hoverPt.name) {
line = this.lineData[i];
break;
}
}
if (line !== null) {
// Draw the hovered line and dots in a different color.
ctx.strokeStyle = HOVER_COLOR;
ctx.fillStyle = HOVER_COLOR;
ctx.lineWidth = this.HOVER_LINE_WIDTH;
// Just draw the dots, not the line.
if (this.dots) {
ctx.fill(line.detail.dotsPath!);
ctx.stroke(line.detail.dotsPath!);
}
}
if (this.inZoomDrag === 'details') {
this.drawZoomRect(ctx, this.zoomRect);
} else if (this.inZoomDrag === 'no-zoom') {
// Draw the crosshairs.
ctx.strokeStyle = this.CROSSHAIR_COLOR;
ctx.lineWidth = AXIS_LINE_WIDTH;
ctx.beginPath();
const thinX = Math.floor(this.crosshair.x) + 0.5; // Make sure we get a thin line.
const thinY = Math.floor(this.crosshair.y) + 0.5; // Make sure we get a thin line.
ctx.moveTo(this.detailArea.rect.x, thinY);
ctx.lineTo(this.detailArea.rect.x + this.detailArea.rect.width, thinY);
ctx.moveTo(thinX, this.detailArea.rect.y);
ctx.lineTo(thinX, this.detailArea.rect.y + this.detailArea.rect.height);
ctx.stroke();
// Y label at crosshair if shift is pressed.
if (this.crosshair.shift) {
// Draw the label offset from the crosshair.
ctx.font = this.LABEL_FONT;
ctx.textBaseline = 'bottom';
const label = this.numberFormatter.format(this.hoverPt.y);
let x = this.crosshair.x + this.MARGIN;
let y = this.crosshair.y - this.MARGIN;
// First draw a white backdrop.
ctx.fillStyle = this.LABEL_BACKGROUND;
const meas = ctx.measureText(label);
const labelHeight = this.LABEL_FONT_SIZE + 2 * this.LABEL_MARGIN;
const labelWidth = meas.width + this.LABEL_MARGIN * 2;
// Bump the text to different quadrants so it is always visible.
if (y < this.detailArea.rect.y + this.detailArea.rect.height / 2) {
y = this.crosshair.y + this.MARGIN;
}
if (x > this.detailArea.rect.x + this.detailArea.rect.width / 2) {
x = x - labelWidth - 2 * this.MARGIN;
}
ctx.beginPath();
ctx.rect(
x - this.LABEL_MARGIN,
y + this.LABEL_MARGIN,
labelWidth,
-labelHeight,
);
ctx.fill();
ctx.strokeStyle = this.LABEL_COLOR;
ctx.beginPath();
ctx.rect(
x - this.LABEL_MARGIN,
y + this.LABEL_MARGIN,
labelWidth,
-labelHeight,
);
ctx.stroke();
// Now draw text on top.
ctx.fillStyle = this.LABEL_COLOR;
ctx.fillText(label, x, y);
}
}
}
ctx.restore();
}
// Draw a dashed rectangle for the details zoom.
private drawZoomRect(ctx: CanvasRenderingContext2D, rect: Rect) {
ctx.strokeStyle = this.LABEL_COLOR;
ctx.lineWidth = 1;
ctx.setLineDash([2, 2]);
ctx.strokeRect(rect.x, rect.y, rect.width, rect.height);
ctx.setLineDash([]);
}
// Draw the xbar in the given area with the given width.
private drawXBar(ctx: CanvasRenderingContext2D, area: Area, width: number) {
if (this.xbar === -1) {
return;
}
ctx.lineWidth = width;
ctx.strokeStyle = this.CROSSHAIR_COLOR;
const bx = area.range.x(this._xbar);
ctx.beginPath();
ctx.moveTo(bx, area.rect.y);
ctx.lineTo(bx, area.rect.y + area.rect.height);
ctx.stroke();
}
// Draw the bands in the given area with the given width.
private drawBands(ctx: CanvasRenderingContext2D, area: Area, width: number) {
ctx.lineWidth = width;
ctx.strokeStyle = this.BAND_COLOR;
ctx.setLineDash([width, width]);
ctx.beginPath();
this._bands.forEach((band) => {
const bx = area.range.x(band);
ctx.moveTo(bx, area.rect.y);
ctx.lineTo(bx, area.rect.y + area.rect.height);
});
ctx.stroke();
ctx.setLineDash([]);
}
// Draw everything on the trace canvas.
//
// Well, not quite everything, if we are drag zooming then we only redraw the
// details and not the summary.
private drawTracesCanvas() {
const width = this.ctx!.canvas.width;
const height = this.ctx!.canvas.height;
const ctx = this.ctx!;
if (this.inZoomDrag !== 'no-zoom') {
ctx.clearRect(
this.detailArea.rect.x - this.MARGIN,
this.detailArea.rect.y - this.MARGIN,
this.detailArea.rect.width + 2 * this.MARGIN,
this.detailArea.rect.height + 2 * this.MARGIN,
);
} else {
ctx.clearRect(0, 0, width, height);
}
ctx.fillStyle = this.LABEL_BACKGROUND;
// Draw the detail.
ctx.save();
{
// Block to scope save/restore.
clipToRect(ctx, this.detailArea.rect);
this.drawXAxis(ctx, this.detailArea);
ctx.fillStyle = this.LABEL_BACKGROUND;
this.lineData.forEach((line) => {
ctx.strokeStyle = line.color;
ctx.lineWidth = DETAIL_LINE_WIDTH;
ctx.stroke(line.detail.linePath!);
if (this.dots) {
ctx.fill(line.detail.dotsPath!);
ctx.stroke(line.detail.dotsPath!);
}
});
}
ctx.restore();
this.drawXAxis(ctx, this.detailArea);
if (this.inZoomDrag === 'no-zoom' && this.summary) {
// Draw the summary.
ctx.save();
{
// Block to scope save/restore.
clipToRect(ctx, this.summaryArea.rect);
this.lineData.forEach((line) => {
ctx.fillStyle = this.LABEL_BACKGROUND;
ctx.strokeStyle = line.color;
ctx.lineWidth = SUMMARY_LINE_WIDTH;
ctx.stroke(line.summary.linePath!);
if (this.dots) {
ctx.fill(line.summary.dotsPath!);
ctx.stroke(line.summary.dotsPath!);
}
});
}
ctx.restore();
this.drawXAxis(ctx, this.summaryArea);
}
// Draw y-Axes.
this.drawYAxis(ctx, this.detailArea);
this.drawOverlayCanvas();
}
// Draw a y-axis using the given context in the given area.
private drawYAxis(ctx: CanvasRenderingContext2D, area: DetailArea) {
ctx.strokeStyle = this.LABEL_COLOR;
ctx.fillStyle = this.LABEL_COLOR;
ctx.font = this.LABEL_FONT;
ctx.textBaseline = 'middle';
ctx.lineWidth = AXIS_LINE_WIDTH;
ctx.textAlign = 'right';
ctx.stroke(area.yaxis.path);
const labelWidth = (3 * this.LEFT_MARGIN) / 4;
area.yaxis.labels.forEach((label) => {
ctx.fillText(label.text, label.x + labelWidth, label.y, labelWidth);
});
}
// Draw a x-axis using the given context in the given area.
private drawXAxis(ctx: CanvasRenderingContext2D, area: Area) {
ctx.strokeStyle = this.LABEL_COLOR;
ctx.fillStyle = this.LABEL_COLOR;
ctx.font = this.LABEL_FONT;
ctx.textBaseline = 'middle';
ctx.lineWidth = AXIS_LINE_WIDTH;
ctx.stroke(area.axis.path);
area.axis.labels.forEach((label) => {
ctx.fillText(label.text, label.x - 2, label.y);
});
}
/**
* An array of trace ids to highlight. Set to [] to remove all highlighting.
*/
get highlight(): string[] {
return Object.keys(this.highlighted);
}
set highlight(ids: string[]) {
this.highlighted = {};
ids.forEach((name) => {
this.highlighted[name] = true;
});
this.drawOverlayCanvas();
}
/**
* Location to put a vertical marking bar on the graph. Can be set to -1 to
* not display any bar.
*/
get xbar(): number {
return this._xbar;
}
set xbar(value: number) {
this._xbar = value;
this.drawOverlayCanvas();
}
/**
* A list of x source offsets to place vertical markers. into labels. Can be
* set to [] to remove all bands.
*/
get bands(): number[] {
return this._bands;
}
set bands(bands: number[]) {
if (!bands) {
this._bands = [];
} else {
this._bands = bands;
}
this.drawOverlayCanvas();
}
/** The zoom range, an array of two values in source x units. Can be set to
* null to have no zoom.
*/
get zoom(): ZoomRange {
return this._zoom;
}
set zoom(range: ZoomRange) {
this._zoom = range;
if (this.zoomTask) {
return;
}
this.zoomTask = window.setTimeout(() => this._zoomImpl());
}
private _zoomImpl() {
this.updateScaleDomains();
this.recalcDetailPaths();
this.drawTracesCanvas();
this.zoomTask = 0;
}
static get observedAttributes(): string[] {
return ['width', 'height', 'summary'];
}
/** Mirrors the width attribute. */
get width(): number {
return +(this.getAttribute('width') || '0');
}
set width(val: number) {
this.setAttribute('width', val.toString());
}
/** Mirrors the height attribute. */
get height(): number {
return +(this.getAttribute('height') || '0');
}
set height(val: number) {
this.setAttribute('height', val.toString());
}
/** @prop summary {string} Mirrors the summary attribute. */
get summary(): boolean {
return this.hasAttribute('summary');
}
set summary(val: boolean) {
if (val) {
this.setAttribute('summary', val.toString());
} else {
this.removeAttribute('summary');
}
}
/** @prop nodots {boolean} Mirrors the nodots attribute. */
get dots(): boolean { return this._dots; }
set dots(val: boolean) {
this._dots = val;
this.drawTracesCanvas();
}
}
define('plot-simple-sk', PlotSimpleSk);