1 /*
2 * Copyright 2014 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
8 #include "gm.h"
9 #include "SkPath.h"
10 #include "SkRandom.h"
11
12 #define W 400
13 #define H 400
14 #define N 10
15
16 constexpr SkScalar SH = SkIntToScalar(H);
17
rnd_quad(SkPath * p,SkPaint * paint,SkRandom & rand)18 static void rnd_quad(SkPath* p, SkPaint* paint, SkRandom& rand) {
19 auto a = rand.nextRangeScalar(0,W),
20 b = rand.nextRangeScalar(0,H);
21 p->moveTo(a,b);
22 for (int x = 0; x < 2; ++x) {
23 auto c = rand.nextRangeScalar(W/4, W),
24 d = rand.nextRangeScalar( 0, H),
25 e = rand.nextRangeScalar( 0, W),
26 f = rand.nextRangeScalar(H/4, H);
27 p->quadTo(c,d,e,f);
28 }
29 paint->setColor(rand.nextU());
30 SkScalar width = rand.nextRangeScalar(1, 5);
31 width *= width;
32 paint->setStrokeWidth(width);
33 paint->setAlpha(0xFF);
34 }
35
rnd_cubic(SkPath * p,SkPaint * paint,SkRandom & rand)36 static void rnd_cubic(SkPath* p, SkPaint* paint, SkRandom& rand) {
37 auto a = rand.nextRangeScalar(0,W),
38 b = rand.nextRangeScalar(0,H);
39 p->moveTo(a,b);
40 for (int x = 0; x < 2; ++x) {
41 auto c = rand.nextRangeScalar(W/4, W),
42 d = rand.nextRangeScalar( 0, H),
43 e = rand.nextRangeScalar( 0, W),
44 f = rand.nextRangeScalar(H/4, H),
45 g = rand.nextRangeScalar(W/4, W),
46 h = rand.nextRangeScalar(H/4, H);
47 p->cubicTo(c,d,e,f,g,h);
48 }
49 paint->setColor(rand.nextU());
50 SkScalar width = rand.nextRangeScalar(1, 5);
51 width *= width;
52 paint->setStrokeWidth(width);
53 paint->setAlpha(0xFF);
54 }
55
56 class BeziersGM : public skiagm::GM {
57 public:
BeziersGM()58 BeziersGM() {}
59
60 protected:
61
onShortName()62 SkString onShortName() override {
63 return SkString("beziers");
64 }
65
onISize()66 SkISize onISize() override {
67 return SkISize::Make(W, H*2);
68 }
69
onDraw(SkCanvas * canvas)70 void onDraw(SkCanvas* canvas) override {
71 SkPaint paint;
72 paint.setStyle(SkPaint::kStroke_Style);
73 paint.setStrokeWidth(SkIntToScalar(9)/2);
74 paint.setAntiAlias(true);
75
76 SkRandom rand;
77 for (int i = 0; i < N; i++) {
78 SkPath p;
79 rnd_quad(&p, &paint, rand);
80 canvas->drawPath(p, paint);
81 }
82 canvas->translate(0, SH);
83 for (int i = 0; i < N; i++) {
84 SkPath p;
85 rnd_cubic(&p, &paint, rand);
86 canvas->drawPath(p, paint);
87 }
88 }
89
90 private:
91 typedef skiagm::GM INHERITED;
92 };
93
94 DEF_GM( return new BeziersGM; )
95