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
11namespace skiagm {
12
13class PointsGM : public GM {
14public:
15    PointsGM() {}
16
17protected:
18
19    SkString onShortName() override {
20        return SkString("points");
21    }
22
23    SkISize onISize() 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) 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
65private:
66    typedef GM INHERITED;
67};
68
69//////////////////////////////////////////////////////////////////////////////
70
71static GM* MyFactory(void*) { return new PointsGM; }
72static GMRegistry reg(MyFactory);
73
74}
75