1 /*
2 * Copyright 2012 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 "SkCanvas.h"
10 #include "SkPaint.h"
11 #include "SkGradientShader.h"
12
intToScalars(SkScalar dst[],const int src[],int n)13 static void intToScalars(SkScalar dst[], const int src[], int n) {
14 for (int i = 0; i < n; ++i) {
15 dst[i] = SkIntToScalar(src[i]);
16 }
17 }
18
drawGrad(SkCanvas * canvas,const SkScalar d0[],const SkScalar d1[])19 static void drawGrad(SkCanvas* canvas, const SkScalar d0[], const SkScalar d1[]) {
20 const SkRect bounds = SkRect::MakeXYWH(SkIntToScalar(-50),
21 SkIntToScalar(-50),
22 SkIntToScalar(200),
23 SkIntToScalar(100));
24
25 SkPoint c0 = { d0[0], d0[1] };
26 SkScalar r0 = d0[2];
27 SkPoint c1 = { d1[0], d1[1] };
28 SkScalar r1 = d1[2];
29
30 SkColor colors[] = { SK_ColorGREEN, SK_ColorRED };
31 SkPaint paint;
32 paint.setAntiAlias(true);
33
34 SkString str;
35 str.printf("%g,%g,%g %g,%g,%g",
36 SkScalarToFloat(c0.fX), SkScalarToFloat(c0.fY), SkScalarToFloat(r0),
37 SkScalarToFloat(c1.fX), SkScalarToFloat(c1.fY), SkScalarToFloat(r1));
38 canvas->drawText(str.c_str(), str.size(),
39 bounds.fLeft, bounds.fTop - paint.getTextSize()/2, paint);
40
41 paint.setShader(SkGradientShader::CreateTwoPointConical(c0, r0, c1, r1,
42 colors, NULL, 2,
43 SkShader::kClamp_TileMode))->unref();
44 canvas->drawRect(bounds, paint);
45
46 paint.setShader(NULL);
47 paint.setColor(0x66000000);
48 paint.setStyle(SkPaint::kStroke_Style);
49 canvas->drawCircle(c0.fX, c0.fY, r0, paint);
50 canvas->drawCircle(c1.fX, c1.fY, r1, paint);
51 canvas->drawRect(bounds, paint);
52 }
53
54 class TwoPointRadialGM : public skiagm::GM {
55 public:
TwoPointRadialGM()56 TwoPointRadialGM() {}
57
58 protected:
onShortName()59 SkString onShortName() {
60 return SkString("twopointconical");
61 }
62
onISize()63 SkISize onISize() { return skiagm::make_isize(480, 780); }
64
onDraw(SkCanvas * canvas)65 virtual void onDraw(SkCanvas* canvas) {
66 if (false) {
67 SkPaint paint;
68 paint.setColor(SK_ColorBLUE);
69 canvas->drawRect(
70 SkRect::MakeWH(SkIntToScalar(this->getISize().fWidth),
71 SkIntToScalar(this->getISize().fHeight)),
72 paint);
73 }
74 SkPaint paint;
75 const int R0 = 20;
76 const int R1 = 40;
77
78 const SkScalar DX = SkIntToScalar(250);
79 const SkScalar DY = SkIntToScalar(130);
80
81 canvas->translate(SkIntToScalar(60), SkIntToScalar(70));
82
83 static const int gData[] = {
84 0, 0, R0, 0, 0, R1,
85 0, 0, R0, 20, 0, R1,
86 0, 0, R0, 25, 0, R1,
87 0, 0, R0, 100, 0, R1,
88 0, 0, R0, 25, 0, R0,
89 0, 0, R0, 100, 0, R0,
90 };
91
92 int count = SK_ARRAY_COUNT(gData) / 6;
93 for (int i = 0; i < count; ++i) {
94 SkScalar data[6];
95 intToScalars(data, &gData[i * 6], 6);
96
97 int n = canvas->save();
98 drawGrad(canvas, &data[0], &data[3]);
99 canvas->translate(DX, 0);
100 drawGrad(canvas, &data[3], &data[0]);
101 canvas->restoreToCount(n);
102 canvas->translate(0, DY);
103 }
104 }
105 };
106
107 //////////////////////////////////////////////////////////////////////////////
108
F(void *)109 static skiagm::GM* F(void*) { return new TwoPointRadialGM; }
110
111 static skiagm::GMRegistry gR(F);
112