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 #include "gm.h"
8 #include "SkRandom.h"
9
10 namespace skiagm {
11
12 class PointsGM : public GM {
13 public:
PointsGM()14 PointsGM() {}
15
16 protected:
17
onShortName()18 SkString onShortName() override {
19 return SkString("points");
20 }
21
onISize()22 SkISize onISize() override {
23 return SkISize::Make(640, 490);
24 }
25
fill_pts(SkPoint pts[],size_t n,SkRandom * rand)26 static void fill_pts(SkPoint pts[], size_t n, SkRandom* 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
onDraw(SkCanvas * canvas)37 void onDraw(SkCanvas* canvas) override {
38 canvas->translate(SK_Scalar1, SK_Scalar1);
39
40 SkRandom 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
MyFactory(void *)70 static GM* MyFactory(void*) { return new PointsGM; }
71 static GMRegistry reg(MyFactory);
72
73 }
74