/*
* Copyright 2017 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 ShadowUtilsView : public SampleView {
SkTArray<SkPath> fConvexPaths;
SkTArray<SkPath> fConcavePaths;
SkScalar fZDelta;
bool fShowAmbient;
bool fShowSpot;
bool fUseAlt;
bool fShowObject;
bool fIgnoreShadowAlpha;
public:
ShadowUtilsView()
: fZDelta(0)
, fShowAmbient(true)
, fShowSpot(true)
, fUseAlt(false)
, fShowObject(false)
, fIgnoreShadowAlpha(false) {}
protected:
void onOnceBeforeDraw() override {
fConvexPaths.push_back().addRoundRect(SkRect::MakeWH(50, 50), 10, 10);
SkRRect oddRRect;
oddRRect.setNinePatch(SkRect::MakeWH(50, 50), 9, 13, 6, 16);
fConvexPaths.push_back().addRRect(oddRRect);
fConvexPaths.push_back().addRect(SkRect::MakeWH(50, 50));
fConvexPaths.push_back().addCircle(25, 25, 25);
fConvexPaths.push_back().cubicTo(100, 50, 20, 100, 0, 0);
fConvexPaths.push_back().addOval(SkRect::MakeWH(20, 60));
// star
fConcavePaths.push_back().moveTo(0.0f, -33.3333f);
fConcavePaths.back().lineTo(9.62f, -16.6667f);
fConcavePaths.back().lineTo(28.867f, -16.6667f);
fConcavePaths.back().lineTo(19.24f, 0.0f);
fConcavePaths.back().lineTo(28.867f, 16.6667f);
fConcavePaths.back().lineTo(9.62f, 16.6667f);
fConcavePaths.back().lineTo(0.0f, 33.3333f);
fConcavePaths.back().lineTo(-9.62f, 16.6667f);
fConcavePaths.back().lineTo(-28.867f, 16.6667f);
fConcavePaths.back().lineTo(-19.24f, 0.0f);
fConcavePaths.back().lineTo(-28.867f, -16.6667f);
fConcavePaths.back().lineTo(-9.62f, -16.6667f);
fConcavePaths.back().close();
// dumbbell
fConcavePaths.push_back().moveTo(50, 0);
fConcavePaths.back().cubicTo(100, 25, 60, 50, 50, 0);
fConcavePaths.back().cubicTo(0, -25, 40, -50, 50, 0);
}
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "ShadowUtils");
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) {
return true;
}
}
return this->INHERITED::onQuery(evt);
}
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFFFFFFFF);
}
void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
const SkPoint3& zPlaneParams,
const SkPaint& paint, SkScalar ambientAlpha,
const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha,
uint32_t flags) {
if (fIgnoreShadowAlpha) {
ambientAlpha = 255;
spotAlpha = 255;
}
if (!fShowAmbient) {
ambientAlpha = 0;
}
if (!fShowSpot) {
spotAlpha = 0;
}
if (fUseAlt) {
flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
}
SkColor ambientColor = SkColorSetARGB(ambientAlpha * 255, 255, 0, 0);
SkColor spotColor = SkColorSetARGB(spotAlpha * 255, 0, 0, 255);
SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
lightPos, lightWidth,
ambientColor, spotColor, 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);
static constexpr int kW = 800;
static constexpr SkScalar kPad = 15.f;
static constexpr SkScalar kLightR = 100.f;
static constexpr SkScalar kHeight = 50.f;
static constexpr SkScalar kAmbientAlpha = 0.5f;
static constexpr SkScalar kSpotAlpha = 0.5f;
static constexpr SkPoint3 lightPos = { 250, 400, 500 };
canvas->translate(3 * kPad, 3 * kPad);
canvas->save();
SkScalar x = 0;
SkScalar dy = 0;
SkTDArray<SkMatrix> matrices;
matrices.push()->reset();
SkMatrix* m = matrices.push();
m->setRotate(33.f, 25.f, 25.f);
m->postScale(1.2f, 0.8f, 25.f, 25.f);
SkPaint paint;
paint.setColor(SK_ColorGREEN);
paint.setAntiAlias(true);
SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, SkTMax(1.0f, kHeight + fZDelta));
// convex paths
for (auto& m : matrices) {
for (auto flags : { kNone_ShadowFlag, kTransparentOccluder_ShadowFlag }) {
for (const auto& path : fConvexPaths) {
SkRect postMBounds = path.getBounds();
m.mapRect(&postMBounds);
SkScalar w = postMBounds.width() + kHeight;
SkScalar dx = w + kPad;
if (x + dx > kW - 3 * kPad) {
canvas->restore();
canvas->translate(0, dy);
canvas->save();
x = 0;
dy = 0;
}
canvas->save();
canvas->concat(m);
this->drawShadowedPath(canvas, path, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightR, kSpotAlpha, flags);
canvas->restore();
canvas->translate(dx, 0);
x += dx;
dy = SkTMax(dy, postMBounds.height() + kPad + kHeight);
}
}
}
// concave paths
canvas->restore();
canvas->translate(kPad, dy);
canvas->save();
x = kPad;
dy = 0;
for (auto& m : matrices) {
for (const auto& path : fConcavePaths) {
SkRect postMBounds = path.getBounds();
m.mapRect(&postMBounds);
SkScalar w = postMBounds.width();
SkScalar dx = w + kPad;
canvas->save();
canvas->concat(m);
this->drawShadowedPath(canvas, path, zPlaneParams, paint, kAmbientAlpha, lightPos,
kLightR, kSpotAlpha, kNone_ShadowFlag);
canvas->restore();
canvas->translate(dx, 0);
x += dx;
dy = SkTMax(dy, postMBounds.height() + kPad + kHeight);
}
}
// Show where the light is in x,y as a circle (specified in device space).
SkMatrix invCanvasM = canvas->getTotalMatrix();
if (invCanvasM.invert(&invCanvasM)) {
canvas->save();
canvas->concat(invCanvasM);
SkPaint paint;
paint.setColor(SK_ColorBLACK);
paint.setAntiAlias(true);
canvas->drawCircle(lightPos.fX, lightPos.fY, kLightR / 10.f, paint);
canvas->restore();
}
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ShadowUtilsView; }
static SkViewRegister reg(MyFactory);