| /* |
| * 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.h" |
| #include "SkAnimTimer.h" |
| #include "SkCanvas.h" |
| #include "SkPathMeasure.h" |
| #include "SkRandom.h" |
| |
| class AddArcGM : public skiagm::GM { |
| public: |
| AddArcGM() : fRotate(0) {} |
| |
| protected: |
| SkString onShortName() SK_OVERRIDE { return SkString("addarc"); } |
| |
| SkISize onISize() SK_OVERRIDE { return SkISize::Make(1040, 1040); } |
| |
| void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| canvas->translate(20, 20); |
| |
| SkRect r = SkRect::MakeWH(1000, 1000); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| 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(rand.nextU() | (0xFF << 24)); |
| SkScalar startAngle = rand.nextUScalar1() * 360; |
| |
| SkScalar speed = SkScalarSqrt(16 / r.width()) * 0.5f; |
| startAngle += fRotate * 360 * speed * sign; |
| |
| SkPath path; |
| path.addArc(r, startAngle, sweepAngle); |
| canvas->drawPath(path, paint); |
| |
| r.inset(inset, inset); |
| sign = -sign; |
| } |
| } |
| |
| bool onAnimate(const SkAnimTimer& timer) SK_OVERRIDE { |
| fRotate = timer.scaled(1, 360); |
| return true; |
| } |
| |
| private: |
| SkScalar fRotate; |
| typedef skiagm::GM INHERITED; |
| }; |
| DEF_GM( return new AddArcGM; ) |
| |
| /////////////////////////////////////////////////// |
| |
| #define R 400 |
| |
| class AddArcMeasGM : public skiagm::GM { |
| public: |
| AddArcMeasGM() {} |
| |
| protected: |
| SkString onShortName() SK_OVERRIDE { return SkString("addarc_meas"); } |
| |
| SkISize onISize() SK_OVERRIDE { return SkISize::Make(2*R + 40, 2*R + 40); } |
| |
| void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| canvas->translate(R + 20, R + 20); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| |
| 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); |
| |
| SkPath path; |
| path.addArc(oval, 0, deg); |
| SkPathMeasure meas(path, false); |
| SkScalar arcLen = rad * R; |
| SkPoint pos; |
| if (meas.getPosTan(arcLen, &pos, NULL)) { |
| canvas->drawLine(0, 0, pos.x(), pos.y(), measPaint); |
| } |
| } |
| } |
| |
| private: |
| typedef skiagm::GM INHERITED; |
| }; |
| DEF_GM( return new AddArcMeasGM; ) |