1
2 /*
3 * Copyright 2016 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "SampleCode.h"
9 #include "SkAnimTimer.h"
10 #include "SkBlurMask.h"
11 #include "SkBlurMaskFilter.h"
12 #include "SkColorFilter.h"
13 #include "SkCamera.h"
14 #include "SkCanvas.h"
15 #include "SkPath.h"
16 #include "SkPathOps.h"
17 #include "SkPoint3.h"
18 #include "SkShadowUtils.h"
19 #include "SkUtils.h"
20 #include "SkView.h"
21 #include "sk_tool_utils.h"
22
23 ////////////////////////////////////////////////////////////////////////////
24
25 class ShadowsView : public SampleView {
26 SkPath fRectPath;
27 SkPath fRRPath;
28 SkPath fCirclePath;
29 SkPath fFunkyRRPath;
30 SkPath fCubicPath;
31 SkPath fSquareRRectPath;
32 SkPath fWideRectPath;
33 SkPath fWideOvalPath;
34 SkPoint3 fLightPos;
35 SkScalar fZDelta;
36 SkScalar fAnimTranslate;
37 SkScalar fAnimAngle;
38 SkScalar fAnimAlpha;
39
40 bool fShowAmbient;
41 bool fShowSpot;
42 bool fUseAlt;
43 bool fShowObject;
44 bool fIgnoreShadowAlpha;
45 bool fDoAlphaAnimation;
46
47 public:
ShadowsView()48 ShadowsView()
49 : fZDelta(0)
50 , fAnimTranslate(0)
51 , fAnimAngle(0)
52 , fAnimAlpha(1)
53 , fShowAmbient(true)
54 , fShowSpot(true)
55 , fUseAlt(false)
56 , fShowObject(true)
57 , fIgnoreShadowAlpha(false)
58 , fDoAlphaAnimation(false) {}
59
60 protected:
onOnceBeforeDraw()61 void onOnceBeforeDraw() override {
62 fCirclePath.addCircle(0, 0, 50);
63 fRectPath.addRect(SkRect::MakeXYWH(-100, -50, 200, 100));
64 fRRPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-100, -50, 200, 100), 4, 4));
65 fFunkyRRPath.addRoundRect(SkRect::MakeXYWH(-50, -50, SK_Scalar1 * 100, SK_Scalar1 * 100),
66 40 * SK_Scalar1, 20 * SK_Scalar1,
67 SkPath::kCW_Direction);
68 fCubicPath.cubicTo(100 * SK_Scalar1, 50 * SK_Scalar1,
69 20 * SK_Scalar1, 100 * SK_Scalar1,
70 0 * SK_Scalar1, 0 * SK_Scalar1);
71 fSquareRRectPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-50, -50, 100, 100),
72 10, 10));
73 fWideRectPath.addRect(SkRect::MakeXYWH(0, 0, 630, 70));
74 fWideOvalPath.addOval(SkRect::MakeXYWH(0, 0, 630, 70));
75
76 fLightPos = SkPoint3::Make(350, 0, 600);
77 }
78
79 // overrides from SkEventSink
onQuery(SkEvent * evt)80 bool onQuery(SkEvent* evt) override {
81 if (SampleCode::TitleQ(*evt)) {
82 SampleCode::TitleR(evt, "AndroidShadows");
83 return true;
84 }
85
86 SkUnichar uni;
87 if (SampleCode::CharQ(*evt, &uni)) {
88 bool handled = false;
89 switch (uni) {
90 case 'W':
91 fShowAmbient = !fShowAmbient;
92 handled = true;
93 break;
94 case 'S':
95 fShowSpot = !fShowSpot;
96 handled = true;
97 break;
98 case 'T':
99 fUseAlt = !fUseAlt;
100 handled = true;
101 break;
102 case 'O':
103 fShowObject = !fShowObject;
104 handled = true;
105 break;
106 case 'N':
107 fDoAlphaAnimation = !fDoAlphaAnimation;
108 if (!fDoAlphaAnimation) {
109 fAnimAlpha = 1;
110 }
111 handled = true;
112 break;
113 case '>':
114 fZDelta += 0.5f;
115 handled = true;
116 break;
117 case '<':
118 fZDelta -= 0.5f;
119 handled = true;
120 break;
121 case '?':
122 fIgnoreShadowAlpha = !fIgnoreShadowAlpha;
123 handled = true;
124 break;
125 default:
126 break;
127 }
128 if (handled) {
129 return true;
130 }
131 }
132 return this->INHERITED::onQuery(evt);
133 }
134
drawBG(SkCanvas * canvas)135 void drawBG(SkCanvas* canvas) {
136 canvas->drawColor(0xFFDDDDDD);
137 }
138
drawShadowedPath(SkCanvas * canvas,const SkPath & path,const SkPoint3 & zPlaneParams,const SkPaint & paint,SkScalar ambientAlpha,const SkPoint3 & lightPos,SkScalar lightWidth,SkScalar spotAlpha)139 void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
140 const SkPoint3& zPlaneParams,
141 const SkPaint& paint, SkScalar ambientAlpha,
142 const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) {
143 if (fIgnoreShadowAlpha) {
144 ambientAlpha = 255;
145 spotAlpha = 255;
146 }
147 if (!fShowAmbient) {
148 ambientAlpha = 0;
149 }
150 if (!fShowSpot) {
151 spotAlpha = 0;
152 }
153 uint32_t flags = 0;
154 if (fUseAlt) {
155 flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
156 }
157
158 SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
159 lightPos, lightWidth,
160 ambientAlpha, spotAlpha, SK_ColorBLACK, flags);
161
162 if (fShowObject) {
163 canvas->drawPath(path, paint);
164 } else {
165 SkPaint strokePaint;
166
167 strokePaint.setColor(paint.getColor());
168 strokePaint.setStyle(SkPaint::kStroke_Style);
169
170 canvas->drawPath(path, strokePaint);
171 }
172 }
173
onDrawContent(SkCanvas * canvas)174 void onDrawContent(SkCanvas* canvas) override {
175 this->drawBG(canvas);
176 const SkScalar kLightWidth = 800;
177 const SkScalar kAmbientAlpha = 0.1f;
178 const SkScalar kSpotAlpha = 0.25f;
179
180 SkPaint paint;
181 paint.setAntiAlias(true);
182
183 SkPoint3 lightPos = fLightPos;
184 SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, 0);
185
186 paint.setColor(SK_ColorWHITE);
187 canvas->translate(200, 90);
188 zPlaneParams.fZ = SkTMax(1.0f, 2 + fZDelta);
189 this->drawShadowedPath(canvas, fRRPath, zPlaneParams, paint, fAnimAlpha*kAmbientAlpha,
190 lightPos, kLightWidth, fAnimAlpha*kSpotAlpha);
191
192 paint.setColor(SK_ColorRED);
193 canvas->translate(250, 0);
194 zPlaneParams.fZ = SkTMax(1.0f, 8 + fZDelta);
195 this->drawShadowedPath(canvas, fRectPath, zPlaneParams, paint, fAnimAlpha*kAmbientAlpha,
196 lightPos, kLightWidth, fAnimAlpha*kSpotAlpha);
197
198 paint.setColor(SK_ColorBLUE);
199 canvas->translate(-250, 110);
200 zPlaneParams.fZ = SkTMax(1.0f, 12 + fZDelta);
201 this->drawShadowedPath(canvas, fCirclePath, zPlaneParams, paint, fAnimAlpha*kAmbientAlpha,
202 lightPos, kLightWidth, fAnimAlpha*0.5f);
203
204 paint.setColor(SK_ColorGREEN);
205 canvas->translate(250, 0);
206 zPlaneParams.fZ = SkTMax(1.0f, 64 + fZDelta);
207 this->drawShadowedPath(canvas, fRRPath, zPlaneParams, paint, fAnimAlpha*kAmbientAlpha,
208 lightPos, kLightWidth, fAnimAlpha*kSpotAlpha);
209
210 paint.setColor(SK_ColorYELLOW);
211 canvas->translate(-250, 110);
212 zPlaneParams.fZ = SkTMax(1.0f, 8 + fZDelta);
213 this->drawShadowedPath(canvas, fFunkyRRPath, zPlaneParams, paint, fAnimAlpha*kAmbientAlpha,
214 lightPos, kLightWidth, fAnimAlpha*kSpotAlpha);
215
216 paint.setColor(SK_ColorCYAN);
217 canvas->translate(250, 0);
218 zPlaneParams.fZ = SkTMax(1.0f, 16 + fZDelta);
219 this->drawShadowedPath(canvas, fCubicPath, zPlaneParams, paint, fAnimAlpha*kAmbientAlpha,
220 lightPos, kLightWidth, fAnimAlpha*kSpotAlpha);
221
222 // circular reveal
223 SkPath tmpPath;
224 SkPath tmpClipPath;
225 tmpClipPath.addCircle(fAnimTranslate, 0, 60);
226 Op(fSquareRRectPath, tmpClipPath, kIntersect_SkPathOp, &tmpPath);
227
228 paint.setColor(SK_ColorMAGENTA);
229 canvas->translate(-125, 60);
230 zPlaneParams.fZ = SkTMax(1.0f, 32 + fZDelta);
231 this->drawShadowedPath(canvas, tmpPath, zPlaneParams, paint, .1f,
232 lightPos, kLightWidth, .5f);
233
234 // perspective paths
235 SkPoint pivot = SkPoint::Make(fWideRectPath.getBounds().width()/2,
236 fWideRectPath.getBounds().height()/2);
237 SkPoint translate = SkPoint::Make(100, 450);
238 paint.setColor(SK_ColorWHITE);
239 Sk3DView view;
240 view.save();
241 view.rotateX(fAnimAngle);
242 SkMatrix persp;
243 view.getMatrix(&persp);
244 persp.preTranslate(-pivot.fX, -pivot.fY);
245 persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY);
246 canvas->setMatrix(persp);
247 SkScalar radians = SkDegreesToRadians(fAnimAngle);
248 zPlaneParams = SkPoint3::Make(0,
249 SkScalarSin(-radians),
250 SkTMax(1.0f, 16 + fZDelta) - SkScalarSin(-radians)*pivot.fY);
251 this->drawShadowedPath(canvas, fWideRectPath, zPlaneParams, paint, .1f,
252 lightPos, kLightWidth, .5f);
253
254 pivot = SkPoint::Make(fWideOvalPath.getBounds().width() / 2,
255 fWideOvalPath.getBounds().height() / 2);
256 translate = SkPoint::Make(100, 600);
257 view.restore();
258 view.rotateY(fAnimAngle);
259 view.getMatrix(&persp);
260 persp.preTranslate(-pivot.fX, -pivot.fY);
261 persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY);
262 canvas->setMatrix(persp);
263 zPlaneParams = SkPoint3::Make(-SkScalarSin(radians),
264 0,
265 SkTMax(1.0f, 32 + fZDelta) + SkScalarSin(radians)*pivot.fX);
266 this->drawShadowedPath(canvas, fWideOvalPath, zPlaneParams, paint, .1f,
267 lightPos, kLightWidth, .5f);
268 }
269
onAnimate(const SkAnimTimer & timer)270 bool onAnimate(const SkAnimTimer& timer) override {
271 fAnimTranslate = timer.pingPong(30, 0, 200, -200);
272 fAnimAngle = timer.pingPong(15, 0, 0, 20);
273 if (fDoAlphaAnimation) {
274 fAnimAlpha = timer.pingPong(5, 0, 1, 0);
275 }
276 return true;
277 }
278
279 private:
280 typedef SampleView INHERITED;
281 };
282
283 //////////////////////////////////////////////////////////////////////////////
284
MyFactory()285 static SkView* MyFactory() { return new ShadowsView; }
286 static SkViewRegister reg(MyFactory);
287