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    virtual uint32_t onGetFlags() const SK_OVERRIDE {
60        return kSkipTiled_Flag;
61    }
62
63    SkString onShortName() {
64        return SkString("twopointconical");
65    }
66
67    SkISize onISize() { return SkISize::Make(480, 780); }
68
69    virtual void onDraw(SkCanvas* canvas) {
70        if (false) {
71            SkPaint paint;
72            paint.setColor(SK_ColorBLUE);
73            canvas->drawRect(
74                    SkRect::MakeWH(SkIntToScalar(this->getISize().fWidth),
75                                   SkIntToScalar(this->getISize().fHeight)),
76                    paint);
77        }
78        SkPaint paint;
79        const int R0 = 20;
80        const int R1 = 40;
81
82        const SkScalar DX = SkIntToScalar(250);
83        const SkScalar DY = SkIntToScalar(130);
84
85        canvas->translate(SkIntToScalar(60), SkIntToScalar(70));
86
87        static const int gData[] = {
88            0, 0, R0,       0, 0, R1,
89            0, 0, R0,       20, 0, R1,
90            0, 0, R0,       25, 0, R1,
91            0, 0, R0,       100, 0, R1,
92            0, 0, R0,       25, 0, R0,
93            0, 0, R0,       100, 0, R0,
94        };
95
96        int count = SK_ARRAY_COUNT(gData) / 6;
97        for (int i = 0; i < count; ++i) {
98            SkScalar data[6];
99            intToScalars(data, &gData[i * 6], 6);
100
101            int n = canvas->save();
102            drawGrad(canvas, &data[0], &data[3]);
103            canvas->translate(DX, 0);
104            drawGrad(canvas, &data[3], &data[0]);
105            canvas->restoreToCount(n);
106            canvas->translate(0, DY);
107        }
108    }
109};
110
111//////////////////////////////////////////////////////////////////////////////
112
113static skiagm::GM* F(void*) { return new TwoPointRadialGM; }
114
115static skiagm::GMRegistry gR(F);
116