| /* |
| * Copyright 2016 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/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPathEffect.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkDashPathEffect.h" |
| #include "tools/timer/TimeUtils.h" |
| |
| int dash1[] = { 1, 1 }; |
| int dash2[] = { 1, 3 }; |
| int dash3[] = { 1, 1, 3, 3 }; |
| int dash4[] = { 1, 3, 2, 4 }; |
| |
| struct DashExample { |
| int* pattern; |
| int length; |
| } dashExamples[] = { |
| { dash1, std::size(dash1) }, |
| { dash2, std::size(dash2) }, |
| { dash3, std::size(dash3) }, |
| { dash4, std::size(dash4) } |
| }; |
| |
| |
| class DashCircleGM : public skiagm::GM { |
| public: |
| DashCircleGM() : fRotation(0) { } |
| |
| protected: |
| SkString getName() const override { return SkString("dashcircle"); } |
| |
| SkISize getISize() override { return SkISize::Make(900, 1200); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkPaint refPaint; |
| refPaint.setAntiAlias(true); |
| refPaint.setColor(0xFFbf3f7f); |
| refPaint.setStroke(true); |
| refPaint.setStrokeWidth(1); |
| const SkScalar radius = 125; |
| SkRect oval = SkRect::MakeLTRB(-radius - 20, -radius - 20, radius + 20, radius + 20); |
| SkPath circle = SkPath::Circle(0, 0, radius); |
| SkScalar circumference = radius * SK_ScalarPI * 2; |
| int wedges[] = { 6, 12, 36 }; |
| canvas->translate(radius+20, radius+20); |
| for (int wedge : wedges) { |
| SkScalar arcLength = 360.f / wedge; |
| canvas->save(); |
| for (const DashExample& dashExample : dashExamples) { |
| SkPathBuilder refPath; |
| int dashUnits = 0; |
| for (int index = 0; index < dashExample.length; ++index) { |
| dashUnits += dashExample.pattern[index]; |
| } |
| SkScalar unitLength = arcLength / dashUnits; |
| SkScalar angle = 0; |
| for (int index = 0; index < wedge; ++index) { |
| for (int i2 = 0; i2 < dashExample.length; i2 += 2) { |
| SkScalar span = dashExample.pattern[i2] * unitLength; |
| refPath.moveTo(0, 0); |
| refPath.arcTo(oval, angle, span, false); |
| refPath.close(); |
| angle += span + (dashExample.pattern[i2 + 1]) * unitLength; |
| } |
| } |
| canvas->save(); |
| canvas->rotate(fRotation); |
| canvas->drawPath(refPath.detach(), refPaint); |
| canvas->restore(); |
| SkPaint p; |
| p.setAntiAlias(true); |
| p.setStroke(true); |
| p.setStrokeWidth(10); |
| SkScalar intervals[4]; |
| int intervalCount = dashExample.length; |
| SkScalar dashLength = circumference / wedge / dashUnits; |
| for (int index = 0; index < dashExample.length; ++index) { |
| intervals[index] = dashExample.pattern[index] * dashLength; |
| } |
| p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0)); |
| canvas->save(); |
| canvas->rotate(fRotation); |
| canvas->drawPath(circle, p); |
| canvas->restore(); |
| canvas->translate(0, radius * 2 + 50); |
| } |
| canvas->restore(); |
| canvas->translate(radius * 2 + 50, 0); |
| } |
| } |
| |
| bool onAnimate(double nanos) override { |
| constexpr SkScalar kDesiredDurationSecs = 100.0f; |
| |
| fRotation = TimeUtils::Scaled(1e-9 * nanos, 360.0f/kDesiredDurationSecs, 360.0f); |
| return true; |
| } |
| |
| private: |
| SkScalar fRotation; |
| |
| using INHERITED = GM; |
| }; |
| |
| DEF_GM(return new DashCircleGM; ) |
| |
| class DashCircle2GM : public skiagm::GM { |
| public: |
| DashCircle2GM() {} |
| |
| protected: |
| SkString getName() const override { return SkString("dashcircle2"); } |
| |
| SkISize getISize() override { return SkISize::Make(635, 900); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| // These intervals are defined relative to tau. |
| static constexpr SkScalar kIntervals[][2]{ |
| {0.333f, 0.333f}, |
| {0.015f, 0.015f}, |
| {0.01f , 0.09f }, |
| {0.097f, 0.003f}, |
| {0.02f , 0.04f }, |
| {0.1f , 0.2f }, |
| {0.25f , 0.25f }, |
| {0.6f , 0.7f }, // adds to > 1 |
| {1.2f , 0.8f }, // on is > 1 |
| {0.1f , 1.1f }, // off is > 1*/ |
| }; |
| |
| static constexpr int kN = std::size(kIntervals); |
| static constexpr SkScalar kRadius = 20.f; |
| static constexpr SkScalar kStrokeWidth = 15.f; |
| static constexpr SkScalar kPad = 5.f; |
| static constexpr SkRect kCircle = {-kRadius, -kRadius, kRadius, kRadius}; |
| |
| static constexpr SkScalar kThinRadius = kRadius * 1.5; |
| static constexpr SkRect kThinCircle = {-kThinRadius, -kThinRadius, |
| kThinRadius, kThinRadius}; |
| static constexpr SkScalar kThinStrokeWidth = 0.4f; |
| |
| sk_sp<SkPathEffect> deffects[std::size(kIntervals)]; |
| sk_sp<SkPathEffect> thinDEffects[std::size(kIntervals)]; |
| for (int i = 0; i < kN; ++i) { |
| static constexpr SkScalar kTau = 2 * SK_ScalarPI; |
| static constexpr SkScalar kCircumference = kRadius * kTau; |
| SkScalar scaledIntervals[2] = {kCircumference * kIntervals[i][0], |
| kCircumference * kIntervals[i][1]}; |
| deffects[i] = SkDashPathEffect::Make( |
| scaledIntervals, 2, kCircumference * fPhaseDegrees * kTau / 360.f); |
| static constexpr SkScalar kThinCircumference = kThinRadius * kTau; |
| scaledIntervals[0] = kThinCircumference * kIntervals[i][0]; |
| scaledIntervals[1] = kThinCircumference * kIntervals[i][1]; |
| thinDEffects[i] = SkDashPathEffect::Make( |
| scaledIntervals, 2, kThinCircumference * fPhaseDegrees * kTau / 360.f); |
| } |
| |
| SkMatrix rotate; |
| rotate.setRotate(25.f); |
| const SkMatrix kMatrices[]{ |
| SkMatrix::I(), |
| SkMatrix::Scale(1.2f, 1.2f), |
| SkMatrix::MakeAll(1, 0, 0, 0, -1, 0, 0, 0, 1), // y flipper |
| SkMatrix::MakeAll(-1, 0, 0, 0, 1, 0, 0, 0, 1), // x flipper |
| SkMatrix::Scale(0.7f, 0.7f), |
| rotate, |
| SkMatrix::Concat( |
| SkMatrix::Concat(SkMatrix::MakeAll(-1, 0, 0, 0, 1, 0, 0, 0, 1), rotate), |
| rotate) |
| }; |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStrokeWidth(kStrokeWidth); |
| paint.setStroke(true); |
| |
| // Compute the union of bounds of all of our test cases. |
| SkRect bounds = SkRect::MakeEmpty(); |
| const SkRect kBounds = kThinCircle.makeOutset(kThinStrokeWidth / 2.f, |
| kThinStrokeWidth / 2.f); |
| for (const auto& m : kMatrices) { |
| SkRect devBounds; |
| m.mapRect(&devBounds, kBounds); |
| bounds.join(devBounds); |
| } |
| |
| canvas->save(); |
| canvas->translate(-bounds.fLeft + kPad, -bounds.fTop + kPad); |
| for (size_t i = 0; i < std::size(deffects); ++i) { |
| canvas->save(); |
| for (const auto& m : kMatrices) { |
| canvas->save(); |
| canvas->concat(m); |
| |
| paint.setPathEffect(deffects[i]); |
| paint.setStrokeWidth(kStrokeWidth); |
| canvas->drawOval(kCircle, paint); |
| |
| paint.setPathEffect(thinDEffects[i]); |
| paint.setStrokeWidth(kThinStrokeWidth); |
| canvas->drawOval(kThinCircle, paint); |
| |
| canvas->restore(); |
| canvas->translate(bounds.width() + kPad, 0); |
| } |
| canvas->restore(); |
| canvas->translate(0, bounds.height() + kPad); |
| } |
| canvas->restore(); |
| } |
| |
| protected: |
| bool onAnimate(double nanos) override { |
| fPhaseDegrees = 1e-9 * nanos; |
| return true; |
| } |
| |
| // Init with a non-zero phase for when run as a non-animating GM. |
| SkScalar fPhaseDegrees = 12.f; |
| }; |
| |
| DEF_GM(return new DashCircle2GM;) |
| |
| DEF_SIMPLE_GM(maddash, canvas, 1600, 1600) { |
| canvas->drawRect({0, 0, 1600, 1600}, SkPaint()); |
| SkPaint p; |
| p.setColor(SK_ColorRED); |
| p.setAntiAlias(true); |
| p.setStroke(true); |
| p.setStrokeWidth(380); |
| |
| SkScalar intvls[] = { 2.5, 10 /* 1200 */ }; |
| p.setPathEffect(SkDashPathEffect::Make(intvls, 2, 0)); |
| |
| canvas->drawCircle(400, 400, 200, p); |
| |
| SkPathBuilder path; |
| path.moveTo(800, 400); |
| path.quadTo(1000, 400, 1000, 600); |
| path.quadTo(1000, 800, 800, 800); |
| path.quadTo(600, 800, 600, 600); |
| path.quadTo(600, 400, 800, 400); |
| path.close(); |
| canvas->translate(350, 150); |
| p.setStrokeWidth(320); |
| canvas->drawPath(path.detach(), p); |
| |
| path.moveTo(800, 400); |
| path.cubicTo(900, 400, 1000, 500, 1000, 600); |
| path.cubicTo(1000, 700, 900, 800, 800, 800); |
| path.cubicTo(700, 800, 600, 700, 600, 600); |
| path.cubicTo(600, 500, 700, 400, 800, 400); |
| path.close(); |
| canvas->translate(-550, 500); |
| p.setStrokeWidth(300); |
| canvas->drawPath(path.detach(), p); |
| } |