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 
70 DEF_GM( return new PointsGM; )
71 
72 }
73