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- /*
- * 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 "include/core/SkCanvas.h"
- #include "include/core/SkImage.h"
- #include "include/core/SkPath.h"
- #include "include/core/SkPoint3.h"
- #include "include/utils/SkShadowUtils.h"
- #include "samplecode/Sample.h"
- #include "tools/Resources.h"
- ////////////////////////////////////////////////////////////////////////////
- // Sample to compare the Material Design shadow reference to our results
- class ShadowRefView : public Sample {
- SkPath fRRectPath;
- sk_sp<SkImage> fReferenceImage;
- bool fShowAmbient;
- bool fShowSpot;
- bool fUseAlt;
- bool fShowObject;
- public:
- ShadowRefView()
- : fShowAmbient(true)
- , fShowSpot(true)
- , fUseAlt(false)
- , fShowObject(true) {}
- protected:
- void onOnceBeforeDraw() override {
- fRRectPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-130, -128.5, 130, 128.5), 4, 4));
- fReferenceImage = GetResourceAsImage("images/shadowreference.png");
- }
- SkString name() override { return SkString("ShadowReference"); }
- bool onChar(SkUnichar uni) override {
- 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;
- default:
- break;
- }
- if (handled) {
- return true;
- }
- return false;
- }
- void drawBG(SkCanvas* canvas) {
- canvas->drawColor(0xFFFFFFFF);
- canvas->drawImage(fReferenceImage, 10, 30);
- }
- void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
- const SkPoint3& zPlaneParams,
- const SkPaint& paint, SkScalar ambientAlpha,
- const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) {
- if (!fShowAmbient) {
- ambientAlpha = 0;
- }
- if (!fShowSpot) {
- spotAlpha = 0;
- }
- uint32_t flags = 0;
- if (fUseAlt) {
- flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
- }
- SkColor ambientColor = SkColorSetARGB(ambientAlpha * 255, 0, 0, 0);
- SkColor spotColor = SkColorSetARGB(spotAlpha * 255, 0, 0, 0);
- 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);
- const SkScalar kDP = 4; // the reference image is 4x bigger than it is displayed on
- // on the web page, so we need to reflect that here and
- // multiply the heights and light params accordingly
- const SkScalar kLightWidth = kDP*400;
- const SkScalar kAmbientAlpha = 0.03f;
- const SkScalar kSpotAlpha = 0.35f;
- SkPaint paint;
- paint.setAntiAlias(true);
- paint.setColor(SK_ColorWHITE);
- SkPoint3 lightPos = { 175, -800, kDP * 600 };
- SkScalar xPos = 230;
- SkScalar yPos = 254.25f;
- SkRect clipRect = SkRect::MakeXYWH(45, 75, 122, 250);
- SkPoint clipDelta = SkPoint::Make(320, 0);
- SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, kDP * 2);
- canvas->save();
- canvas->clipRect(clipRect);
- canvas->translate(xPos, yPos);
- this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightWidth, kSpotAlpha);
- canvas->restore();
- lightPos.fX += 320;
- xPos += 320;
- clipRect.offset(clipDelta);
- zPlaneParams.fZ = kDP * 3;
- canvas->save();
- canvas->clipRect(clipRect);
- canvas->translate(xPos, yPos);
- this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightWidth, kSpotAlpha);
- canvas->restore();
- lightPos.fX += 320;
- xPos += 320;
- clipRect.offset(clipDelta);
- zPlaneParams.fZ = kDP * 4;
- canvas->save();
- canvas->clipRect(clipRect);
- canvas->translate(xPos, yPos);
- this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightWidth, kSpotAlpha);
- canvas->restore();
- lightPos.fX += 320;
- xPos += 320;
- clipRect.offset(clipDelta);
- zPlaneParams.fZ = kDP * 6;
- canvas->save();
- canvas->clipRect(clipRect);
- canvas->translate(xPos, yPos);
- this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightWidth, kSpotAlpha);
- canvas->restore();
- lightPos.fX += 320;
- xPos += 320;
- clipRect.offset(clipDelta);
- zPlaneParams.fZ = kDP * 8;
- canvas->save();
- canvas->clipRect(clipRect);
- canvas->translate(xPos, yPos);
- this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightWidth, kSpotAlpha);
- canvas->restore();
- lightPos.fX += 320;
- xPos += 320;
- clipRect.offset(clipDelta);
- zPlaneParams.fZ = kDP * 16;
- canvas->save();
- canvas->clipRect(clipRect);
- canvas->translate(xPos, yPos);
- this->drawShadowedPath(canvas, fRRectPath, zPlaneParams, paint, kAmbientAlpha,
- lightPos, kLightWidth, kSpotAlpha);
- canvas->restore();
- }
- private:
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new ShadowRefView(); )
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