OLD | NEW |
| (Empty) |
1 /* | |
2 * Copyright 2013 Google Inc. | |
3 * | |
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 */ | |
9 | |
10 #include "SkExample.h" | |
11 | |
12 #include "SkApplication.h" | |
13 #include "SkDraw.h" | |
14 #include "SkGradientShader.h" | |
15 #include "SkGraphics.h" | |
16 | |
17 class HelloSkia : public SkExample { | |
18 public: | |
19 HelloSkia(SkExampleWindow* window) : SkExample(window) { | |
20 fName = "HelloSkia"; | |
21 fBGColor = SK_ColorWHITE; | |
22 fRotationAngle = SkIntToScalar(0); | |
23 | |
24 fWindow->setupBackend(SkExampleWindow::kGPU_DeviceType); | |
25 // Another option is software rendering: | |
26 // fWindow->setupBackend(SkExampleWindow::kRaster_DeviceType); | |
27 } | |
28 | |
29 protected: | |
30 void draw(SkCanvas* canvas) { | |
31 // Clear background | |
32 canvas->drawColor(fBGColor); | |
33 | |
34 SkPaint paint; | |
35 paint.setColor(SK_ColorRED); | |
36 | |
37 // Draw a rectangle with blue paint | |
38 SkRect rect = { | |
39 SkIntToScalar(10), SkIntToScalar(10), | |
40 SkIntToScalar(128), SkIntToScalar(128) | |
41 }; | |
42 canvas->drawRect(rect, paint); | |
43 | |
44 // Set up a linear gradient and draw a circle | |
45 { | |
46 SkPoint linearPoints[] = { | |
47 {SkIntToScalar(0), SkIntToScalar(0)}, | |
48 {SkIntToScalar(300), SkIntToScalar(300)} | |
49 }; | |
50 SkColor linearColors[] = {SK_ColorGREEN, SK_ColorBLACK}; | |
51 | |
52 SkShader* shader = SkGradientShader::CreateLinear( | |
53 linearPoints, linearColors, NULL, 2, | |
54 SkShader::kMirror_TileMode); | |
55 SkAutoUnref shader_deleter(shader); | |
56 | |
57 paint.setShader(shader); | |
58 paint.setFlags(SkPaint::kAntiAlias_Flag); | |
59 | |
60 canvas->drawCircle(SkIntToScalar(200), SkIntToScalar(200), | |
61 SkIntToScalar(64), paint); | |
62 | |
63 // Detach shader | |
64 paint.setShader(NULL); | |
65 } | |
66 | |
67 // Draw a message with a nice black paint. | |
68 paint.setFlags( | |
69 SkPaint::kAntiAlias_Flag | | |
70 SkPaint::kSubpixelText_Flag | // ... avoid waggly text when rot
ating. | |
71 SkPaint::kUnderlineText_Flag); | |
72 paint.setColor(SK_ColorBLACK); | |
73 paint.setTextSize(SkIntToScalar(20)); | |
74 | |
75 canvas->save(); | |
76 | |
77 static const char message[] = "Hello Skia!!!"; | |
78 | |
79 // Translate and rotate | |
80 canvas->translate(SkIntToScalar(300), SkIntToScalar(300)); | |
81 fRotationAngle += SkDoubleToScalar(0.2); | |
82 if (fRotationAngle > SkDoubleToScalar(360.0)) { | |
83 fRotationAngle -= SkDoubleToScalar(360.0); | |
84 } | |
85 canvas->rotate(fRotationAngle); | |
86 | |
87 // Draw the text: | |
88 canvas->drawText(message, strlen(message), SkIntToScalar(0), SkIntToScal
ar(0), paint); | |
89 | |
90 canvas->restore(); | |
91 | |
92 // Invalidate the window to force a redraw. Poor man's animation mechani
sm. | |
93 this->fWindow->inval(NULL); | |
94 } | |
95 | |
96 private: | |
97 SkScalar fRotationAngle; | |
98 SkColor fBGColor; | |
99 }; | |
100 | |
101 static SkExample* MyFactory(SkExampleWindow* window) { | |
102 return new HelloSkia(window); | |
103 } | |
104 | |
105 // Register this class as a Skia Example. | |
106 SkExample::Registry registry(MyFactory); | |
OLD | NEW |