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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