1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm/gm.h" 9 #include "include/core/SkCanvas.h" 10 #include "include/core/SkColor.h" 11 #include "include/core/SkPaint.h" 12 #include "include/core/SkPoint.h" 13 #include "include/core/SkScalar.h" 14 #include "include/core/SkSize.h" 15 #include "include/core/SkString.h" 16 #include "include/utils/SkRandom.h" 17 18 #include <stddef.h> 19 20 namespace skiagm { 21 22 class PointsGM : public GM { 23 public: PointsGM()24 PointsGM() {} 25 26 protected: 27 onShortName()28 SkString onShortName() override { 29 return SkString("points"); 30 } 31 onISize()32 SkISize onISize() override { 33 return SkISize::Make(640, 490); 34 } 35 fill_pts(SkPoint pts[],size_t n,SkRandom * rand)36 static void fill_pts(SkPoint pts[], size_t n, SkRandom* rand) { 37 for (size_t i = 0; i < n; i++) { 38 // Compute these independently and store in variables, rather 39 // than in the parameter-passing expression, to get consistent 40 // evaluation order across compilers. 41 SkScalar y = rand->nextUScalar1() * 480; 42 SkScalar x = rand->nextUScalar1() * 640; 43 pts[i].set(x, y); 44 } 45 } 46 onDraw(SkCanvas * canvas)47 void onDraw(SkCanvas* canvas) override { 48 canvas->translate(SK_Scalar1, SK_Scalar1); 49 50 SkRandom rand; 51 SkPaint p0, p1, p2, p3; 52 const size_t n = 99; 53 54 p0.setColor(SK_ColorRED); 55 p1.setColor(SK_ColorGREEN); 56 p2.setColor(SK_ColorBLUE); 57 p3.setColor(SK_ColorWHITE); 58 59 p0.setStrokeWidth(SkIntToScalar(4)); 60 p2.setStrokeCap(SkPaint::kRound_Cap); 61 p2.setStrokeWidth(SkIntToScalar(6)); 62 63 SkPoint* pts = new SkPoint[n]; 64 fill_pts(pts, n, &rand); 65 66 canvas->drawPoints(SkCanvas::kPolygon_PointMode, n, pts, p0); 67 canvas->drawPoints(SkCanvas::kLines_PointMode, n, pts, p1); 68 canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p2); 69 canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p3); 70 71 delete[] pts; 72 } 73 74 private: 75 typedef GM INHERITED; 76 }; 77 78 ////////////////////////////////////////////////////////////////////////////// 79 80 DEF_GM( return new PointsGM; ) 81 82 } 83