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