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
13static 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
19static 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
54class TwoPointRadialGM : public skiagm::GM {
55public:
56    TwoPointRadialGM() {}
57
58protected:
59    SkString onShortName() {
60        return SkString("twopointconical");
61    }
62
63    SkISize onISize() { return skiagm::make_isize(480, 780); }
64
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
109static skiagm::GM* F(void*) { return new TwoPointRadialGM; }
110
111static skiagm::GMRegistry gR(F);
112