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1 // Copyright 2020 Google LLC.
2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3 #include "tools/fiddle/examples.h"
4 REG_FIDDLE(example3ps, 320, 256, false, 0) {
setpsmatrix(float sx,float kx,float ky,float sy,float tx,float ty,int h)5 static SkMatrix setpsmatrix(float sx, float kx, float ky, float sy, float tx, float ty, int h) {
6     SkMatrix m;
7 
8     m.setAll(sx, -kx, -tx * sx - (ty - h) * kx, -ky, sy, (ty - h) * sy + tx * ky, 0, 0, 1);
9     return m;
10 }
11 
draw(SkCanvas * canvas)12 void draw(SkCanvas* canvas) {
13     canvas->save();
14     canvas->scale(15, -15);
15     canvas->translate(0, -28);
16     SkPath path;
17     path.moveTo(2, 2);
18     path.lineTo(3, 3);
19     path.lineTo(3, 4);
20     path.lineTo(2, 4);
21     path.lineTo(1, 5);
22     path.close();
23     SkPaint p;
24     p.setAntiAlias(true);
25     p.setStrokeWidth(0.1f);
26 
27     canvas->save();
28     canvas->translate(0, 18);
29     p.setColor(SK_ColorGRAY);
30     canvas->drawPath(path, p);
31     canvas->restore();
32 
33     p.setStyle(SkPaint::kStroke_Style);
34     canvas->save();
35     canvas->translate(8, 19);
36     canvas->rotate(90);
37     p.setColor(SK_ColorRED);
38     canvas->drawPath(path, p);
39     canvas->restore();
40 
41     canvas->save();
42     canvas->translate(5, 23);
43     canvas->rotate(-90);
44     p.setColor(SK_ColorBLUE);
45     canvas->drawPath(path, p);
46     canvas->restore();
47 
48     canvas->save();
49     canvas->translate(14, 18);
50     canvas->scale(-1, 1);
51     p.setColor(0xFF007F00);
52     canvas->drawPath(path, p);
53     canvas->restore();
54     canvas->restore();
55 
56     canvas->scale(15, 15);
57     canvas->translate(0, 24);
58 
59     SkMatrix m;
60     unsigned char d[] = {0x00, 0x00, 0x00, 0x00, 0xff, 0xff};
61     sk_sp<SkData> data = SkData::MakeWithoutCopy((unsigned char*)d, sizeof(d));
62     SkImageInfo info =
63             SkImageInfo::Make(3, 2, SkColorType::kGray_8_SkColorType, kOpaque_SkAlphaType);
64     sk_sp<SkImage> image = SkImage::MakeRasterData(info, data, 3);
65 
66     SkPaint bp;
67     canvas->save();
68     m = setpsmatrix(1, 0, 0, 1, -1, -24, 2);
69     //  m.setAll(1, 0, -1, 0, 1, -24, 0, 0, 1);
70     canvas->concat(m);
71     canvas->drawImage(image, 0, 0, &bp);
72     canvas->restore();
73 
74     canvas->save();
75     m = setpsmatrix(0, 1, 1, 0, -24, -5, 2);
76     //  m.setAll(0, -1, 5, -1, 0, -22, 0, 0, 1);
77     canvas->concat(m);
78     canvas->drawImage(image, 0, 0, &bp);
79     canvas->restore();
80 
81     canvas->save();
82     m = setpsmatrix(0, 1, -1, 0, 27, -8, 2);
83     //  m.setAll(0, -1, 8, 1, 0, -25, 0, 0, 1);
84     canvas->concat(m);
85     canvas->drawImage(image, 0, 0, &bp);
86     canvas->restore();
87 
88     canvas->save();
89     m = setpsmatrix(0, -1, -1, 0, -24, 13, 2);
90     //  m.setAll(0, 1, 9, -1, 0, -22, 0, 0, 1);
91     canvas->concat(m);
92     canvas->drawImage(image, 0, 0, &bp);
93     canvas->restore();
94 
95     canvas->save();
96     m = setpsmatrix(-1, 0, 0, -1, 17, 26, 2);
97     //  m.setAll(-1, 0, 15, 0, -1, -22, 0, 0, 1);
98     canvas->concat(m);
99     canvas->drawImage(image, 0, 0, &bp);
100     canvas->restore();
101 
102     canvas->save();
103     m = setpsmatrix(-1, 0, 0, 1, 21, -24, 2);
104     //  m.setAll(-1, 0, 19, 0, 1, -24, 0, 0, 1);
105     canvas->concat(m);
106     canvas->drawImage(image, 0, 0, &bp);
107     canvas->restore();
108 }
109 }  // END FIDDLE
110