a634f3b29f2b410cbc7058c00cfab85f8227230a
[platform/upstream/libSkiaSharp.git] / gm / points.cpp
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
19     SkString onShortName() SK_OVERRIDE {
20         return SkString("points");
21     }
22
23     SkISize onISize() SK_OVERRIDE {
24         return SkISize::Make(640, 490);
25     }
26
27     static void fill_pts(SkPoint pts[], size_t n, SkRandom* rand) {
28         for (size_t i = 0; i < n; i++) {
29             // Compute these independently and store in variables, rather
30             // than in the parameter-passing expression, to get consistent
31             // evaluation order across compilers.
32             SkScalar y = rand->nextUScalar1() * 480;
33             SkScalar x = rand->nextUScalar1() * 640;
34             pts[i].set(x, y);
35         }
36     }
37
38     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
39         canvas->translate(SK_Scalar1, SK_Scalar1);
40
41         SkRandom rand;
42         SkPaint  p0, p1, p2, p3;
43         const size_t n = 99;
44
45         p0.setColor(SK_ColorRED);
46         p1.setColor(SK_ColorGREEN);
47         p2.setColor(SK_ColorBLUE);
48         p3.setColor(SK_ColorWHITE);
49
50         p0.setStrokeWidth(SkIntToScalar(4));
51         p2.setStrokeCap(SkPaint::kRound_Cap);
52         p2.setStrokeWidth(SkIntToScalar(6));
53
54         SkPoint* pts = new SkPoint[n];
55         fill_pts(pts, n, &rand);
56
57         canvas->drawPoints(SkCanvas::kPolygon_PointMode, n, pts, p0);
58         canvas->drawPoints(SkCanvas::kLines_PointMode, n, pts, p1);
59         canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p2);
60         canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, p3);
61
62         delete[] pts;
63     }
64
65 private:
66     typedef GM INHERITED;
67 };
68
69 //////////////////////////////////////////////////////////////////////////////
70
71 static GM* MyFactory(void*) { return new PointsGM; }
72 static GMRegistry reg(MyFactory);
73
74 }