aboutsummaryrefslogtreecommitdiffhomepage
path: root/samplecode/SampleAndroidShadows.cpp
blob: f15df9fe3773245f5102c4e0bf0534c02f1f4197 (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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274

/*
 * Copyright 2016 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 "SkAnimTimer.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkColorFilter.h"
#include "SkCamera.h"
#include "SkCanvas.h"
#include "SkPath.h"
#include "SkPathOps.h"
#include "SkPoint3.h"
#include "SkShadowUtils.h"
#include "SkUtils.h"
#include "SkView.h"
#include "sk_tool_utils.h"

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

class ShadowsView : public SampleView {
    SkPath    fRectPath;
    SkPath    fRRPath;
    SkPath    fCirclePath;
    SkPath    fFunkyRRPath;
    SkPath    fCubicPath;
    SkPath    fSquareRRectPath;
    SkPath    fWideRectPath;
    SkPath    fWideOvalPath;
    SkPoint3  fLightPos;
    SkScalar  fZDelta;
    SkScalar  fAnimTranslate;
    SkScalar  fAnimAngle;

    bool      fShowAmbient;
    bool      fShowSpot;
    bool      fUseAlt;
    bool      fShowObject;
    bool      fIgnoreShadowAlpha;

public:
    ShadowsView()
        : fZDelta(0)
        , fAnimTranslate(0)
        , fAnimAngle(0)
        , fShowAmbient(true)
        , fShowSpot(true)
        , fUseAlt(false)
        , fShowObject(true)
        , fIgnoreShadowAlpha(false) {}

protected:
    void onOnceBeforeDraw() override {
        fCirclePath.addCircle(0, 0, 50);
        fRectPath.addRect(SkRect::MakeXYWH(-100, -50, 200, 100));
        fRRPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-100, -50, 200, 100), 4, 4));
        fFunkyRRPath.addRoundRect(SkRect::MakeXYWH(-50, -50, SK_Scalar1 * 100, SK_Scalar1 * 100),
                                  40 * SK_Scalar1, 20 * SK_Scalar1,
                                  SkPath::kCW_Direction);
        fCubicPath.cubicTo(100 * SK_Scalar1, 50 * SK_Scalar1,
                           20 * SK_Scalar1, 100 * SK_Scalar1,
                           0 * SK_Scalar1, 0 * SK_Scalar1);
        fSquareRRectPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-50, -50, 100, 100),
                                                      10, 10));
        fWideRectPath.addRect(SkRect::MakeXYWH(0, 0, 630, 70));
        fWideOvalPath.addOval(SkRect::MakeXYWH(0, 0, 630, 70));

        fLightPos = SkPoint3::Make(350, 0, 600);
    }

    // overrides from SkEventSink
    bool onQuery(SkEvent* evt) override {
        if (SampleCode::TitleQ(*evt)) {
            SampleCode::TitleR(evt, "AndroidShadows");
            return true;
        }

        SkUnichar uni;
        if (SampleCode::CharQ(*evt, &uni)) {
            bool handled = false;
            switch (uni) {
                case 'W':
                    fShowAmbient = !fShowAmbient;
                    handled = true;
                    break;
                case 'S':
                    fShowSpot = !fShowSpot;
                    handled = true;
                    break;
                case 'T':
                    fUseAlt = !fUseAlt;
                    handled = true;
                    break;
                case 'O':
                    fShowObject = !fShowObject;
                    handled = true;
                    break;
                case '>':
                    fZDelta += 0.5f;
                    handled = true;
                    break;
                case '<':
                    fZDelta -= 0.5f;
                    handled = true;
                    break;
                case '?':
                    fIgnoreShadowAlpha = !fIgnoreShadowAlpha;
                    handled = true;
                    break;
                default:
                    break;
            }
            if (handled) {
                this->inval(nullptr);
                return true;
            }
        }
        return this->INHERITED::onQuery(evt);
    }

    void drawBG(SkCanvas* canvas) {
        canvas->drawColor(0xFFDDDDDD);
    }

    void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
                          const SkPoint3& zPlaneParams,
                          const SkPaint& paint, SkScalar ambientAlpha,
                          const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) {
        if (fIgnoreShadowAlpha) {
            ambientAlpha = 255;
            spotAlpha = 255;
        }
        if (!fShowAmbient) {
            ambientAlpha = 0;
        }
        if (!fShowSpot) {
            spotAlpha = 0;
        }
        uint32_t flags = 0;
        if (fUseAlt) {
            flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
        }

        SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
                                  lightPos, lightWidth,
                                  ambientAlpha, spotAlpha, SK_ColorBLACK, flags);

        if (fShowObject) {
            canvas->drawPath(path, paint);
        } else {
            SkPaint strokePaint;

            strokePaint.setColor(paint.getColor());
            strokePaint.setStyle(SkPaint::kStroke_Style);

            canvas->drawPath(path, strokePaint);
        }
    }

    void onDrawContent(SkCanvas* canvas) override {
        this->drawBG(canvas);
        const SkScalar kLightWidth = 800;
        const SkScalar kAmbientAlpha = 0.1f;
        const SkScalar kSpotAlpha = 0.25f;

        SkPaint paint;
        paint.setAntiAlias(true);

        SkPoint3 lightPos = fLightPos;
        SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, 0);

        paint.setColor(SK_ColorWHITE);
        canvas->translate(200, 90);
        zPlaneParams.fZ = SkTMax(1.0f, 2 + fZDelta);
        this->drawShadowedPath(canvas, fRRPath, zPlaneParams, paint, kAmbientAlpha,
                               lightPos, kLightWidth, kSpotAlpha);

        paint.setColor(SK_ColorRED);
        canvas->translate(250, 0);
        zPlaneParams.fZ = SkTMax(1.0f, 8 + fZDelta);
        this->drawShadowedPath(canvas, fRectPath, zPlaneParams, paint, kAmbientAlpha,
                               lightPos, kLightWidth, kSpotAlpha);

        paint.setColor(SK_ColorBLUE);
        canvas->translate(-250, 110);
        zPlaneParams.fZ = SkTMax(1.0f, 12 + fZDelta);
        this->drawShadowedPath(canvas, fCirclePath, zPlaneParams, paint, kAmbientAlpha,
                               lightPos, kLightWidth, 0.5f);

        paint.setColor(SK_ColorGREEN);
        canvas->translate(250, 0);
        zPlaneParams.fZ = SkTMax(1.0f, 64 + fZDelta);
        this->drawShadowedPath(canvas, fRRPath, zPlaneParams, paint, kAmbientAlpha,
                               lightPos, kLightWidth, kSpotAlpha);

        paint.setColor(SK_ColorYELLOW);
        canvas->translate(-250, 110);
        zPlaneParams.fZ = SkTMax(1.0f, 8 + fZDelta);
        this->drawShadowedPath(canvas, fFunkyRRPath, zPlaneParams, paint, kAmbientAlpha,
                               lightPos, kLightWidth, kSpotAlpha);

        paint.setColor(SK_ColorCYAN);
        canvas->translate(250, 0);
        zPlaneParams.fZ = SkTMax(1.0f, 16 + fZDelta);
        this->drawShadowedPath(canvas, fCubicPath, zPlaneParams, paint,
                               kAmbientAlpha, lightPos, kLightWidth, kSpotAlpha);

        // circular reveal
        SkPath tmpPath;
        SkPath tmpClipPath;
        tmpClipPath.addCircle(fAnimTranslate, 0, 60);
        Op(fSquareRRectPath, tmpClipPath, kIntersect_SkPathOp, &tmpPath);

        paint.setColor(SK_ColorMAGENTA);
        canvas->translate(-125, 60);
        zPlaneParams.fZ = SkTMax(1.0f, 32 + fZDelta);
        this->drawShadowedPath(canvas, tmpPath, zPlaneParams, paint, .1f,
                               lightPos, kLightWidth, .5f);

        // perspective paths
        SkPoint pivot = SkPoint::Make(fWideRectPath.getBounds().width()/2,
                                      fWideRectPath.getBounds().height()/2);
        SkPoint translate = SkPoint::Make(100, 450);
        paint.setColor(SK_ColorWHITE);
        Sk3DView view;
        view.save();
        view.rotateX(fAnimAngle);
        SkMatrix persp;
        view.getMatrix(&persp);
        persp.preTranslate(-pivot.fX, -pivot.fY);
        persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY);
        canvas->setMatrix(persp);
        SkScalar radians = SkDegreesToRadians(fAnimAngle);
        zPlaneParams = SkPoint3::Make(0,
                                      SkScalarSin(-radians),
                                      SkTMax(1.0f, 16 + fZDelta) - SkScalarSin(-radians)*pivot.fY);
        this->drawShadowedPath(canvas, fWideRectPath, zPlaneParams, paint, .1f,
                               lightPos, kLightWidth, .5f);

        pivot = SkPoint::Make(fWideOvalPath.getBounds().width() / 2,
                              fWideOvalPath.getBounds().height() / 2);
        translate = SkPoint::Make(100, 600);
        view.restore();
        view.rotateY(fAnimAngle);
        view.getMatrix(&persp);
        persp.preTranslate(-pivot.fX, -pivot.fY);
        persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY);
        canvas->setMatrix(persp);
        zPlaneParams = SkPoint3::Make(-SkScalarSin(radians),
                                      0,
                                      SkTMax(1.0f, 32 + fZDelta) + SkScalarSin(radians)*pivot.fX);
        this->drawShadowedPath(canvas, fWideOvalPath, zPlaneParams, paint, .1f,
                               lightPos, kLightWidth, .5f);
    }

    bool onAnimate(const SkAnimTimer& timer) override {
        fAnimTranslate = timer.pingPong(30, 0, 200, -200);
        fAnimAngle = timer.pingPong(15, 0, 0, 20);

        return true;
    }

private:
    typedef SampleView INHERITED;
};

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

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