aboutsummaryrefslogtreecommitdiffhomepage
path: root/samplecode/SamplePathEffects.cpp
blob: 9af0abb59adb20bf597772e767d08c15f198be46 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "Sk1DPathEffect.h"
#include "SkCornerPathEffect.h"
#include "SkPathMeasure.h"
#include "SkRandom.h"
#include "SkColorPriv.h"
#include "SkPixelXorXfermode.h"

#define CORNER_RADIUS   12
static SkScalar gPhase;

static const int gXY[] = {
    4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
};

static SkPathEffect* make_pe(int flags) {
    if (flags == 1)
        return SkCornerPathEffect::Create(SkIntToScalar(CORNER_RADIUS));

    SkPath  path;
    path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
    for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
        path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
    path.close();
    path.offset(SkIntToScalar(-6), 0);

    SkPathEffect* outer = SkPath1DPathEffect::Create(path, SkIntToScalar(12), gPhase, SkPath1DPathEffect::kRotate_Style);

    if (flags == 2)
        return outer;

    SkPathEffect* inner = SkCornerPathEffect::Create(SkIntToScalar(CORNER_RADIUS));

    SkPathEffect* pe = SkComposePathEffect::Create(outer, inner);
    outer->unref();
    inner->unref();
    return pe;
}

static SkPathEffect* make_warp_pe() {
    SkPath  path;
    path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
    for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
        path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
    path.close();
    path.offset(SkIntToScalar(-6), 0);

    SkPathEffect* outer = SkPath1DPathEffect::Create(
        path, SkIntToScalar(12), gPhase, SkPath1DPathEffect::kMorph_Style);
    SkPathEffect* inner = SkCornerPathEffect::Create(SkIntToScalar(CORNER_RADIUS));

    SkPathEffect* pe = SkComposePathEffect::Create(outer, inner);
    outer->unref();
    inner->unref();
    return pe;
}

///////////////////////////////////////////////////////////

#include "SkColorFilter.h"
#include "SkLayerRasterizer.h"

class TestRastBuilder : public SkLayerRasterizer::Builder {
public:
    TestRastBuilder() {
        SkPaint paint;
        paint.setAntiAlias(true);

#if 0
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeWidth(SK_Scalar1*4);
        this->addLayer(paint);

        paint.setStrokeWidth(SK_Scalar1*1);
        paint.setXfermode(SkXfermode::kClear_Mode);
        this->addLayer(paint);
#else
        paint.setAlpha(0x66);
        this->addLayer(paint, SkIntToScalar(4), SkIntToScalar(4));

        paint.setAlpha(0xFF);
        this->addLayer(paint);
#endif
    }
};

class PathEffectView : public SampleView {
    SkPath  fPath;
    SkPoint fClickPt;
public:
    PathEffectView() {
        SkRandom    rand;
        int         steps = 20;
        SkScalar    dist = SkIntToScalar(400);
        SkScalar    x = SkIntToScalar(20);
        SkScalar    y = SkIntToScalar(50);

        fPath.moveTo(x, y);
        for (int i = 0; i < steps; i++) {
            x += dist/steps;
            SkScalar tmpY = y + SkIntToScalar(rand.nextS() % 25);
            if (i == steps/2) {
                fPath.moveTo(x, tmpY);
            } else {
                fPath.lineTo(x, tmpY);
            }
        }

        {
            SkRect  oval;
            oval.set(SkIntToScalar(20), SkIntToScalar(30),
                     SkIntToScalar(100), SkIntToScalar(60));
            oval.offset(x, 0);
            fPath.addRoundRect(oval, SkIntToScalar(8), SkIntToScalar(8));
        }

        fClickPt.set(SkIntToScalar(200), SkIntToScalar(200));

        this->setBGColor(0xFFDDDDDD);
    }

protected:
    // overrides from SkEventSink
    virtual bool onQuery(SkEvent* evt) {
        if (SampleCode::TitleQ(*evt)) {
            SampleCode::TitleR(evt, "PathEffects");
            return true;
        }
        return this->INHERITED::onQuery(evt);
    }

    virtual void onDrawContent(SkCanvas* canvas) {
        gPhase -= SampleCode::GetAnimSecondsDelta() * 40;
        this->inval(NULL);

        SkPaint paint;

#if 0
        paint.setAntiAlias(true);
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeWidth(SkIntToScalar(5));
        canvas->drawPath(fPath, paint);
        paint.setStrokeWidth(0);

        paint.setColor(SK_ColorWHITE);
        paint.setPathEffect(make_pe(1))->unref();
        canvas->drawPath(fPath, paint);
#endif

        canvas->translate(0, SkIntToScalar(50));

        paint.setColor(SK_ColorBLUE);
        paint.setPathEffect(make_pe(2))->unref();
        canvas->drawPath(fPath, paint);

        canvas->translate(0, SkIntToScalar(50));

        paint.setARGB(0xFF, 0, 0xBB, 0);
        paint.setPathEffect(make_pe(3))->unref();
        canvas->drawPath(fPath, paint);

        canvas->translate(0, SkIntToScalar(50));

        paint.setARGB(0xFF, 0, 0, 0);
        paint.setPathEffect(make_warp_pe())->unref();
        TestRastBuilder testRastBuilder;
        paint.setRasterizer(testRastBuilder.detachRasterizer())->unref();
        canvas->drawPath(fPath, paint);
    }

private:
    typedef SampleView INHERITED;
};

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory() { return new PathEffectView; }
static SkViewRegister reg(MyFactory);