| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkTypes.h" |
| #include "samplecode/Sample.h" |
| #include "src/core/SkClipOpPriv.h" |
| #include "src/core/SkPointPriv.h" |
| #include "tools/ToolUtils.h" |
| |
| class SkEvent; |
| |
| #define FAT_PIXEL_COLOR SK_ColorBLACK |
| #define PIXEL_CENTER_SIZE 3 |
| #define WIRE_FRAME_COLOR 0xFFFF0000 /*0xFF00FFFF*/ |
| #define WIRE_FRAME_SIZE 1.5f |
| |
| static SkScalar apply_grid(SkScalar x) { |
| const SkScalar grid = 2; |
| return SkScalarRoundToScalar(x * grid) / grid; |
| } |
| |
| static void apply_grid(SkPoint pts[], int count) { |
| for (int i = 0; i < count; ++i) { |
| pts[i].set(apply_grid(pts[i].fX), apply_grid(pts[i].fY)); |
| } |
| } |
| |
| static void erase(SkSurface* surface) { |
| surface->getCanvas()->clear(SK_ColorTRANSPARENT); |
| } |
| |
| class FatBits { |
| public: |
| FatBits() { |
| fAA = false; |
| fStyle = kHair_Style; |
| fGrid = false; |
| fShowSkeleton = true; |
| fUseClip = false; |
| fRectAsOval = false; |
| fUseTriangle = false; |
| fStrokeCap = SkPaint::kButt_Cap; |
| |
| fClipRect.set(2, 2, 11, 8 ); |
| } |
| |
| int getZoom() const { return fZoom; } |
| |
| bool getAA() const { return fAA; } |
| void setAA(bool aa) { fAA = aa; } |
| |
| bool getGrid() const { return fGrid; } |
| void setGrid(bool g) { fGrid = g; } |
| |
| bool getShowSkeleton() const { return fShowSkeleton; } |
| void setShowSkeleton(bool ss) { fShowSkeleton = ss; } |
| |
| bool getTriangle() const { return fUseTriangle; } |
| void setTriangle(bool ut) { fUseTriangle = ut; } |
| |
| void toggleRectAsOval() { fRectAsOval = !fRectAsOval; } |
| |
| void togglePixelColors() { |
| if (fShader == fShader0) { |
| fShader = fShader1; |
| } else { |
| fShader = fShader0; |
| } |
| } |
| |
| float fStrokeWidth = 1; |
| |
| bool getUseClip() const { return fUseClip; } |
| void setUseClip(bool uc) { fUseClip = uc; } |
| |
| enum Style { |
| kHair_Style, |
| kStroke_Style, |
| }; |
| Style getStyle() const { return fStyle; } |
| void setStyle(Style s) { fStyle = s; } |
| |
| void setWHZ(int width, int height, int zoom) { |
| fW = width; |
| fH = height; |
| fZoom = zoom; |
| fBounds.set(0, 0, SkIntToScalar(width * zoom), SkIntToScalar(height * zoom)); |
| fMatrix.setScale(SkIntToScalar(zoom), SkIntToScalar(zoom)); |
| fInverse.setScale(SK_Scalar1 / zoom, SK_Scalar1 / zoom); |
| fShader0 = ToolUtils::create_checkerboard_shader(0xFFDDDDDD, 0xFFFFFFFF, zoom); |
| fShader1 = SkShaders::Color(SK_ColorWHITE); |
| fShader = fShader0; |
| |
| SkImageInfo info = SkImageInfo::MakeN32Premul(width, height); |
| fMinSurface = SkSurface::MakeRaster(info); |
| info = info.makeWH(width * zoom, height * zoom); |
| fMaxSurface = SkSurface::MakeRaster(info); |
| } |
| |
| void drawBG(SkCanvas*); |
| void drawFG(SkCanvas*); |
| void drawLine(SkCanvas*, SkPoint pts[2]); |
| void drawRect(SkCanvas* canvas, SkPoint pts[2]); |
| void drawTriangle(SkCanvas* canvas, SkPoint pts[3]); |
| |
| SkPaint::Cap fStrokeCap; |
| |
| private: |
| bool fAA, fGrid, fShowSkeleton, fUseClip, fRectAsOval, fUseTriangle; |
| Style fStyle; |
| int fW, fH, fZoom; |
| SkMatrix fMatrix, fInverse; |
| SkRect fBounds, fClipRect; |
| sk_sp<SkShader> fShader0; |
| sk_sp<SkShader> fShader1; |
| sk_sp<SkShader> fShader; |
| sk_sp<SkSurface> fMinSurface; |
| sk_sp<SkSurface> fMaxSurface; |
| |
| void setupPaint(SkPaint* paint) { |
| bool aa = this->getAA(); |
| paint->setStrokeCap(fStrokeCap); |
| switch (fStyle) { |
| case kHair_Style: |
| paint->setStrokeWidth(0); |
| break; |
| case kStroke_Style: |
| paint->setStrokeWidth(fStrokeWidth); |
| break; |
| } |
| paint->setAntiAlias(aa); |
| } |
| |
| void setupSkeletonPaint(SkPaint* paint) { |
| paint->setStyle(SkPaint::kStroke_Style); |
| paint->setStrokeWidth(WIRE_FRAME_SIZE); |
| paint->setColor(fShowSkeleton ? WIRE_FRAME_COLOR : 0); |
| paint->setAntiAlias(true); |
| } |
| |
| void drawTriangleSkeleton(SkCanvas* max, const SkPoint pts[]); |
| void drawLineSkeleton(SkCanvas* max, const SkPoint pts[]); |
| void drawRectSkeleton(SkCanvas* max, const SkRect& r) { |
| SkPaint paint; |
| this->setupSkeletonPaint(&paint); |
| SkPath path; |
| |
| fRectAsOval ? path.addOval(r) : path.addRect(r); |
| max->drawPath(path, paint); |
| } |
| |
| void copyMinToMax() { |
| erase(fMaxSurface.get()); |
| SkCanvas* canvas = fMaxSurface->getCanvas(); |
| canvas->save(); |
| canvas->concat(fMatrix); |
| fMinSurface->draw(canvas, 0, 0, nullptr); |
| canvas->restore(); |
| |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kClear); |
| for (int iy = 1; iy < fH; ++iy) { |
| SkScalar y = SkIntToScalar(iy * fZoom); |
| canvas->drawLine(0, y - SK_ScalarHalf, 999, y - SK_ScalarHalf, paint); |
| } |
| for (int ix = 1; ix < fW; ++ix) { |
| SkScalar x = SkIntToScalar(ix * fZoom); |
| canvas->drawLine(x - SK_ScalarHalf, 0, x - SK_ScalarHalf, 999, paint); |
| } |
| } |
| }; |
| |
| void FatBits::drawBG(SkCanvas* canvas) { |
| SkPaint paint; |
| |
| paint.setShader(fShader); |
| canvas->drawRect(fBounds, paint); |
| paint.setShader(nullptr); |
| } |
| |
| void FatBits::drawFG(SkCanvas* canvas) { |
| SkPaint inner, outer; |
| |
| inner.setAntiAlias(true); |
| inner.setColor(SK_ColorBLACK); |
| inner.setStrokeWidth(PIXEL_CENTER_SIZE); |
| |
| outer.setAntiAlias(true); |
| outer.setColor(SK_ColorWHITE); |
| outer.setStrokeWidth(PIXEL_CENTER_SIZE + 2); |
| |
| SkScalar half = SkIntToScalar(fZoom) / 2; |
| for (int iy = 0; iy < fH; ++iy) { |
| SkScalar y = SkIntToScalar(iy * fZoom) + half; |
| for (int ix = 0; ix < fW; ++ix) { |
| SkScalar x = SkIntToScalar(ix * fZoom) + half; |
| |
| canvas->drawPoint(x, y, outer); |
| canvas->drawPoint(x, y, inner); |
| } |
| } |
| |
| if (fUseClip) { |
| SkPaint p; |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setColor(SK_ColorLTGRAY); |
| SkRect r = { |
| fClipRect.fLeft * fZoom, |
| fClipRect.fTop * fZoom, |
| fClipRect.fRight * fZoom, |
| fClipRect.fBottom * fZoom |
| }; |
| canvas->drawRect(r, p); |
| } |
| } |
| |
| void FatBits::drawLineSkeleton(SkCanvas* max, const SkPoint pts[]) { |
| SkPaint paint; |
| this->setupSkeletonPaint(&paint); |
| |
| SkPath path; |
| path.moveTo(pts[0]); |
| path.lineTo(pts[1]); |
| |
| if (fStyle == kStroke_Style) { |
| SkPaint p; |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setStrokeWidth(fStrokeWidth * fZoom); |
| p.setStrokeCap(fStrokeCap); |
| SkPath dst; |
| p.getFillPath(path, &dst); |
| path = dst; |
| |
| path.moveTo(pts[0]); |
| path.lineTo(pts[1]); |
| } |
| max->drawPath(path, paint); |
| } |
| |
| void FatBits::drawLine(SkCanvas* canvas, SkPoint pts[]) { |
| SkPaint paint; |
| |
| fInverse.mapPoints(pts, 2); |
| |
| if (fGrid) { |
| apply_grid(pts, 2); |
| } |
| |
| erase(fMinSurface.get()); |
| this->setupPaint(&paint); |
| paint.setColor(FAT_PIXEL_COLOR); |
| if (fUseClip) { |
| fMinSurface->getCanvas()->save(); |
| SkRect r = fClipRect; |
| r.inset(SK_Scalar1/3, SK_Scalar1/3); |
| fMinSurface->getCanvas()->clipRect(r, kIntersect_SkClipOp, true); |
| } |
| fMinSurface->getCanvas()->drawLine(pts[0], pts[1], paint); |
| if (fUseClip) { |
| fMinSurface->getCanvas()->restore(); |
| } |
| this->copyMinToMax(); |
| |
| SkCanvas* max = fMaxSurface->getCanvas(); |
| |
| fMatrix.mapPoints(pts, 2); |
| this->drawLineSkeleton(max, pts); |
| |
| fMaxSurface->draw(canvas, 0, 0, nullptr); |
| } |
| |
| void FatBits::drawRect(SkCanvas* canvas, SkPoint pts[2]) { |
| SkPaint paint; |
| |
| fInverse.mapPoints(pts, 2); |
| |
| if (fGrid) { |
| apply_grid(pts, 2); |
| } |
| |
| SkRect r; |
| r.set(pts, 2); |
| |
| erase(fMinSurface.get()); |
| this->setupPaint(&paint); |
| paint.setColor(FAT_PIXEL_COLOR); |
| { |
| SkCanvas* c = fMinSurface->getCanvas(); |
| fRectAsOval ? c->drawOval(r, paint) : c->drawRect(r, paint); |
| } |
| this->copyMinToMax(); |
| |
| SkCanvas* max = fMaxSurface->getCanvas(); |
| |
| fMatrix.mapPoints(pts, 2); |
| r.set(pts, 2); |
| this->drawRectSkeleton(max, r); |
| |
| fMaxSurface->draw(canvas, 0, 0, nullptr); |
| } |
| |
| void FatBits::drawTriangleSkeleton(SkCanvas* max, const SkPoint pts[]) { |
| SkPaint paint; |
| this->setupSkeletonPaint(&paint); |
| |
| SkPath path; |
| path.moveTo(pts[0]); |
| path.lineTo(pts[1]); |
| path.lineTo(pts[2]); |
| path.close(); |
| |
| max->drawPath(path, paint); |
| } |
| |
| void FatBits::drawTriangle(SkCanvas* canvas, SkPoint pts[3]) { |
| SkPaint paint; |
| |
| fInverse.mapPoints(pts, 3); |
| |
| if (fGrid) { |
| apply_grid(pts, 3); |
| } |
| |
| SkPath path; |
| path.moveTo(pts[0]); |
| path.lineTo(pts[1]); |
| path.lineTo(pts[2]); |
| path.close(); |
| |
| erase(fMinSurface.get()); |
| this->setupPaint(&paint); |
| paint.setColor(FAT_PIXEL_COLOR); |
| fMinSurface->getCanvas()->drawPath(path, paint); |
| this->copyMinToMax(); |
| |
| SkCanvas* max = fMaxSurface->getCanvas(); |
| |
| fMatrix.mapPoints(pts, 3); |
| this->drawTriangleSkeleton(max, pts); |
| |
| fMaxSurface->draw(canvas, 0, 0, nullptr); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| class IndexClick : public Sample::Click { |
| int fIndex; |
| public: |
| IndexClick(int index) : fIndex(index) {} |
| |
| static int GetIndex(Sample::Click* click) { |
| return ((IndexClick*)click)->fIndex; |
| } |
| }; |
| |
| class DrawLineView : public Sample { |
| FatBits fFB; |
| SkPoint fPts[3]; |
| bool fIsRect; |
| int fZoom = 64; |
| public: |
| DrawLineView() { |
| fFB.setWHZ(24*2, 16*2, fZoom); |
| fPts[0].set(1, 1); |
| fPts[1].set(5, 4); |
| fPts[2].set(2, 6); |
| SkMatrix::MakeScale(SkIntToScalar(fZoom)).mapPoints(fPts, 3); |
| fIsRect = false; |
| } |
| |
| void setStyle(FatBits::Style s) { |
| fFB.setStyle(s); |
| } |
| |
| protected: |
| SkString name() override { return SkString("FatBits"); } |
| |
| bool onChar(SkUnichar uni) override { |
| switch (uni) { |
| case 'c': |
| fFB.setUseClip(!fFB.getUseClip()); |
| return true; |
| case 'r': |
| fIsRect = !fIsRect; |
| return true; |
| case 'o': |
| fFB.toggleRectAsOval(); |
| return true; |
| case 'x': |
| fFB.setGrid(!fFB.getGrid()); |
| return true; |
| case 's': |
| if (FatBits::kStroke_Style == fFB.getStyle()) { |
| this->setStyle(FatBits::kHair_Style); |
| } else { |
| this->setStyle(FatBits::kStroke_Style); |
| } |
| return true; |
| case 'k': { |
| const SkPaint::Cap caps[] = { |
| SkPaint::kButt_Cap, SkPaint::kRound_Cap, SkPaint::kSquare_Cap, |
| }; |
| fFB.fStrokeCap = caps[(fFB.fStrokeCap + 1) % 3]; |
| return true; |
| } break; |
| case 'a': |
| fFB.setAA(!fFB.getAA()); |
| return true; |
| case 'w': |
| fFB.setShowSkeleton(!fFB.getShowSkeleton()); |
| return true; |
| case 'g': |
| fFB.togglePixelColors(); |
| return true; |
| case 't': |
| fFB.setTriangle(!fFB.getTriangle()); |
| return true; |
| case '-': |
| fFB.fStrokeWidth -= 0.125f; |
| return true; |
| case '=': |
| fFB.fStrokeWidth += 0.125f; |
| return true; |
| } |
| return false; |
| } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| fFB.drawBG(canvas); |
| if (fFB.getTriangle()) { |
| fFB.drawTriangle(canvas, fPts); |
| } |
| else if (fIsRect) { |
| fFB.drawRect(canvas, fPts); |
| } else { |
| fFB.drawLine(canvas, fPts); |
| } |
| fFB.drawFG(canvas); |
| |
| { |
| SkString str; |
| str.printf("%s %s %s", |
| fFB.getAA() ? "AA" : "BW", |
| FatBits::kHair_Style == fFB.getStyle() ? "Hair" : "Stroke", |
| fFB.getUseClip() ? "clip" : "noclip"); |
| SkPaint paint; |
| paint.setColor(SK_ColorBLUE); |
| SkFont font(nullptr, 16); |
| canvas->drawString(str, 10, 16, font, paint); |
| } |
| } |
| |
| Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi) override { |
| SkPoint pt = { x, y }; |
| int index = -1; |
| int count = fFB.getTriangle() ? 3 : 2; |
| SkScalar tol = 12; |
| |
| for (int i = 0; i < count; ++i) { |
| if (SkPointPriv::EqualsWithinTolerance(fPts[i], pt, tol)) { |
| index = i; |
| break; |
| } |
| } |
| return new IndexClick(index); |
| } |
| |
| bool onClick(Click* click) override { |
| int index = IndexClick::GetIndex(click); |
| if (index >= 0 && index <= 2) { |
| fPts[index] = click->fCurr; |
| } else { |
| SkScalar dx = click->fCurr.fX - click->fPrev.fX; |
| SkScalar dy = click->fCurr.fY - click->fPrev.fY; |
| fPts[0].offset(dx, dy); |
| fPts[1].offset(dx, dy); |
| fPts[2].offset(dx, dy); |
| } |
| return true; |
| } |
| |
| private: |
| |
| typedef Sample INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_SAMPLE( return new DrawLineView(); ) |