| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPathMeasure.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypes.h" |
| #include "include/private/base/SkFloatingPoint.h" |
| #include "src/base/SkRandom.h" |
| #include "tools/ToolUtils.h" |
| #include "tools/timer/TimeUtils.h" |
| |
| class AddArcGM : public skiagm::GM { |
| public: |
| AddArcGM() : fRotate(0) {} |
| |
| protected: |
| SkString getName() const override { return SkString("addarc"); } |
| |
| SkISize getISize() override { return SkISize::Make(1040, 1040); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| canvas->translate(20, 20); |
| |
| SkRect r = SkRect::MakeWH(1000, 1000); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStroke(true); |
| paint.setStrokeWidth(15); |
| |
| const SkScalar inset = paint.getStrokeWidth() + 4; |
| const SkScalar sweepAngle = 345; |
| SkRandom rand; |
| |
| SkScalar sign = 1; |
| while (r.width() > paint.getStrokeWidth() * 3) { |
| paint.setColor(ToolUtils::color_to_565(rand.nextU() | (0xFF << 24))); |
| SkScalar startAngle = rand.nextUScalar1() * 360; |
| |
| SkScalar speed = SkScalarSqrt(16 / r.width()) * 0.5f; |
| startAngle += fRotate * 360 * speed * sign; |
| |
| SkPathBuilder path; |
| path.addArc(r, startAngle, sweepAngle); |
| canvas->drawPath(path.detach().setIsVolatile(true), paint); |
| |
| r.inset(inset, inset); |
| sign = -sign; |
| } |
| } |
| |
| bool onAnimate(double nanos) override { |
| fRotate = TimeUtils::Scaled(1e-9 * nanos, 1, 360); |
| return true; |
| } |
| |
| private: |
| SkScalar fRotate; |
| using INHERITED = skiagm::GM; |
| }; |
| DEF_GM( return new AddArcGM; ) |
| |
| /////////////////////////////////////////////////// |
| |
| #define R 400 |
| |
| DEF_SIMPLE_GM(addarc_meas, canvas, 2*R + 40, 2*R + 40) { |
| canvas->translate(R + 20, R + 20); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStroke(true); |
| |
| SkPaint measPaint; |
| measPaint.setAntiAlias(true); |
| measPaint.setColor(SK_ColorRED); |
| |
| const SkRect oval = SkRect::MakeLTRB(-R, -R, R, R); |
| canvas->drawOval(oval, paint); |
| |
| for (SkScalar deg = 0; deg < 360; deg += 10) { |
| const SkScalar rad = SkDegreesToRadians(deg); |
| SkScalar rx = SkScalarCos(rad) * R; |
| SkScalar ry = SkScalarSin(rad) * R; |
| |
| canvas->drawLine(0, 0, rx, ry, paint); |
| |
| SkPathMeasure meas(SkPathBuilder().addArc(oval, 0, deg).detach(), false); |
| SkScalar arcLen = rad * R; |
| SkPoint pos; |
| if (meas.getPosTan(arcLen, &pos, nullptr)) { |
| canvas->drawLine({0, 0}, pos, measPaint); |
| } |
| } |
| } |
| |
| /////////////////////////////////////////////////// |
| |
| // Emphasize drawing a stroked oval (containing conics) and then scaling the results up, |
| // to ensure that we compute the stroke taking the CTM into account |
| // |
| class StrokeCircleGM : public skiagm::GM { |
| public: |
| StrokeCircleGM() : fRotate(0) {} |
| |
| protected: |
| SkString getName() const override { return SkString("strokecircle"); } |
| |
| SkISize getISize() override { return SkISize::Make(520, 520); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| canvas->scale(20, 20); |
| canvas->translate(13, 13); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStroke(true); |
| paint.setStrokeWidth(SK_Scalar1 / 2); |
| |
| const SkScalar delta = paint.getStrokeWidth() * 3 / 2; |
| SkRect r = SkRect::MakeXYWH(-12, -12, 24, 24); |
| SkRandom rand; |
| |
| SkScalar sign = 1; |
| while (r.width() > paint.getStrokeWidth() * 2) { |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->rotate(fRotate * sign); |
| |
| paint.setColor(ToolUtils::color_to_565(rand.nextU() | (0xFF << 24))); |
| canvas->drawOval(r, paint); |
| r.inset(delta, delta); |
| sign = -sign; |
| } |
| } |
| |
| bool onAnimate(double nanos) override { |
| fRotate = TimeUtils::Scaled(1e-9 * nanos, 60, 360); |
| return true; |
| } |
| |
| private: |
| SkScalar fRotate; |
| |
| using INHERITED = skiagm::GM; |
| }; |
| DEF_GM( return new StrokeCircleGM; ) |
| |
| ////////////////////// |
| |
| // Fill circles and rotate them to test our Analytic Anti-Aliasing. |
| // This test is based on StrokeCircleGM. |
| class FillCircleGM : public skiagm::GM { |
| public: |
| FillCircleGM() : fRotate(0) {} |
| |
| protected: |
| SkString getName() const override { return SkString("fillcircle"); } |
| |
| SkISize getISize() override { return SkISize::Make(520, 520); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| canvas->scale(20, 20); |
| canvas->translate(13, 13); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStroke(true); |
| paint.setStrokeWidth(SK_Scalar1 / 2); |
| |
| const SkScalar strokeWidth = paint.getStrokeWidth(); |
| const SkScalar delta = strokeWidth * 3 / 2; |
| SkRect r = SkRect::MakeXYWH(-12, -12, 24, 24); |
| SkRandom rand; |
| |
| // Reset style to fill. We only need stroke stype for producing delta and strokeWidth |
| paint.setStroke(false); |
| |
| SkScalar sign = 1; |
| while (r.width() > strokeWidth * 2) { |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->rotate(fRotate * sign); |
| paint.setColor(ToolUtils::color_to_565(rand.nextU() | (0xFF << 24))); |
| canvas->drawOval(r, paint); |
| r.inset(delta, delta); |
| sign = -sign; |
| } |
| } |
| |
| bool onAnimate(double nanos) override { |
| fRotate = TimeUtils::Scaled(1e-9 * nanos, 60, 360); |
| return true; |
| } |
| |
| private: |
| SkScalar fRotate; |
| |
| using INHERITED = skiagm::GM; |
| }; |
| DEF_GM( return new FillCircleGM; ) |
| |
| ////////////////////// |
| |
| static void html_canvas_arc(SkPathBuilder* path, SkScalar x, SkScalar y, SkScalar r, SkScalar start, |
| SkScalar end, bool ccw, bool callArcTo) { |
| SkRect bounds = { x - r, y - r, x + r, y + r }; |
| SkScalar sweep = ccw ? end - start : start - end; |
| if (callArcTo) |
| path->arcTo(bounds, start, sweep, false); |
| else |
| path->addArc(bounds, start, sweep); |
| } |
| |
| // Lifted from canvas-arc-circumference-fill-diffs.html |
| DEF_SIMPLE_GM(manyarcs, canvas, 620, 330) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStroke(true); |
| |
| canvas->translate(10, 10); |
| |
| // 20 angles. |
| SkScalar sweepAngles[] = { |
| -123.7f, -2.3f, -2, -1, -0.3f, -0.000001f, 0, 0.000001f, 0.3f, 0.7f, |
| 1, 1.3f, 1.5f, 1.7f, 1.99999f, 2, 2.00001f, 2.3f, 4.3f, 3934723942837.3f |
| }; |
| for (size_t i = 0; i < std::size(sweepAngles); ++i) { |
| sweepAngles[i] *= 180; |
| } |
| |
| SkScalar startAngles[] = { -1, -0.5f, 0, 0.5f }; |
| for (size_t i = 0; i < std::size(startAngles); ++i) { |
| startAngles[i] *= 180; |
| } |
| |
| bool anticlockwise = false; |
| SkScalar sign = 1; |
| for (size_t i = 0; i < std::size(startAngles) * 2; ++i) { |
| if (i == std::size(startAngles)) { |
| anticlockwise = true; |
| sign = -1; |
| } |
| SkScalar startAngle = startAngles[i % std::size(startAngles)] * sign; |
| canvas->save(); |
| for (size_t j = 0; j < std::size(sweepAngles); ++j) { |
| SkPathBuilder path; |
| path.moveTo(0, 2); |
| html_canvas_arc(&path, 18, 15, 10, startAngle, startAngle + (sweepAngles[j] * sign), |
| anticlockwise, true); |
| path.lineTo(0, 28); |
| canvas->drawPath(path.detach().setIsVolatile(true), paint); |
| canvas->translate(30, 0); |
| } |
| canvas->restore(); |
| canvas->translate(0, 40); |
| } |
| } |
| |
| // Lifted from https://bugs.chromium.org/p/chromium/issues/detail?id=640031 |
| DEF_SIMPLE_GM(tinyanglearcs, canvas, 620, 330) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStroke(true); |
| |
| canvas->translate(50, 50); |
| |
| SkScalar outerRadius = 100000.0f; |
| SkScalar innerRadius = outerRadius - 20.0f; |
| SkScalar centerX = 50; |
| SkScalar centerY = outerRadius; |
| SkScalar startAngles[] = { 1.5f * SK_ScalarPI , 1.501f * SK_ScalarPI }; |
| SkScalar sweepAngle = 10.0f / outerRadius; |
| |
| for (size_t i = 0; i < std::size(startAngles); ++i) { |
| SkPathBuilder path; |
| SkScalar endAngle = startAngles[i] + sweepAngle; |
| path.moveTo(centerX + innerRadius * std::cos(startAngles[i]), |
| centerY + innerRadius * std::sin(startAngles[i])); |
| path.lineTo(centerX + outerRadius * std::cos(startAngles[i]), |
| centerY + outerRadius * std::sin(startAngles[i])); |
| // A combination of tiny sweepAngle + large radius, we should draw a line. |
| html_canvas_arc(&path, centerX, outerRadius, outerRadius, |
| startAngles[i] * 180 / SK_ScalarPI, endAngle * 180 / SK_ScalarPI, |
| true, true); |
| path.lineTo(centerX + innerRadius * std::cos(endAngle), |
| centerY + innerRadius * std::sin(endAngle)); |
| html_canvas_arc(&path, centerX, outerRadius, innerRadius, |
| endAngle * 180 / SK_ScalarPI, startAngles[i] * 180 / SK_ScalarPI, |
| true, false); |
| canvas->drawPath(path.detach(), paint); |
| canvas->translate(20, 0); |
| } |
| } |