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:
PointsGM()15 PointsGM() {}
16
17 protected:
18
onShortName()19 SkString onShortName() override {
20 return SkString("points");
21 }
22
onISize()23 SkISize onISize() override {
24 return SkISize::Make(640, 490);
25 }
26
fill_pts(SkPoint pts[],size_t n,SkRandom * rand)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
onDraw(SkCanvas * canvas)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
65 private:
66 typedef GM INHERITED;
67 };
68
69 //////////////////////////////////////////////////////////////////////////////
70
MyFactory(void *)71 static GM* MyFactory(void*) { return new PointsGM; }
72 static GMRegistry reg(MyFactory);
73
74 }
75