| /* |
| * Copyright 2015 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/SkDrawable.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkRSXform.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkSurface.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/utils/SkRandom.h" |
| #include "include/utils/SkTextUtils.h" |
| #include "samplecode/Sample.h" |
| |
| const SkBlendMode gModes[] = { |
| SkBlendMode::kSrcOver, |
| SkBlendMode::kSrc, |
| SkBlendMode::kSrcIn, |
| SkBlendMode::kSrcOut, |
| SkBlendMode::kSrcATop, |
| SkBlendMode::kDstOver, |
| SkBlendMode::kDstIn, |
| SkBlendMode::kDstOut, |
| SkBlendMode::kDstATop, |
| }; |
| const int N_Modes = SK_ARRAY_COUNT(gModes); |
| |
| static SkRandom gRand; |
| |
| struct ModeButton { |
| SkString fLabel; |
| SkColor fColor; |
| SkRect fRect; |
| |
| public: |
| void init(const char label[], const SkRect& rect) { |
| fLabel = label; |
| fRect = rect; |
| fColor = (gRand.nextU() & 0x7F7F7F7F) | SkColorSetARGB(0xFF, 0, 0, 0x80); |
| } |
| |
| void draw(SkCanvas* canvas) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setColor(fColor); |
| canvas->drawRoundRect(fRect, 8, 8, paint); |
| |
| paint.setColor(0xFFFFFFFF); |
| SkFont font; |
| font.setSize(16); |
| font.setEdging(SkFont::Edging::kSubpixelAntiAlias); |
| SkTextUtils::DrawString(canvas, fLabel.c_str(), fRect.centerX(), fRect.fTop + 0.68f * fRect.height(), |
| font, paint, SkTextUtils::kCenter_Align); |
| } |
| |
| bool hitTest(SkScalar x, SkScalar y) { |
| return fRect.intersects(x - 1, y - 1, x + 1, y + 1); |
| } |
| }; |
| |
| class ModeDrawable : public SkDrawable { |
| public: |
| ModeDrawable() : fMode(SkBlendMode::kSrcOver), fLoc(SkPoint::Make(0, 0)) {} |
| |
| SkBlendMode fMode; |
| SkPoint fLoc; |
| |
| bool hitTest(SkScalar x, SkScalar y) { |
| SkRect target = SkRect::MakeXYWH(x - fLoc.x() - 1, y - fLoc.y() - 1, 3, 3); |
| return this->getBounds().intersects(target); |
| } |
| }; |
| |
| class CircDrawable : public ModeDrawable { |
| SkPaint fPaint; |
| SkRect fBounds; |
| |
| public: |
| CircDrawable(SkScalar size, SkColor c) { |
| const SkColor colors[] = { 0, c }; |
| fPaint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(size/2, size/2), size/2, |
| colors, nullptr, 2, |
| SkTileMode::kClamp)); |
| fBounds = SkRect::MakeWH(size, size); |
| } |
| |
| protected: |
| SkRect onGetBounds() override { |
| return fBounds; |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| fPaint.setBlendMode(fMode); |
| canvas->save(); |
| canvas->translate(fLoc.x(), fLoc.y()); |
| canvas->drawOval(fBounds, fPaint); |
| canvas->restore(); |
| } |
| }; |
| |
| class XferDemo : public Sample { |
| enum { |
| N = 4 |
| }; |
| |
| SkRect fModeRect[N_Modes]; |
| ModeButton fModeButtons[N_Modes]; |
| sk_sp<CircDrawable> fDrs[N]; |
| CircDrawable* fSelected; |
| |
| void addButtons() { |
| SkScalar x = 10; |
| SkScalar y = 10; |
| for (int i = 0; i < N_Modes; ++i) { |
| fModeButtons[i].init(SkBlendMode_Name(gModes[i]), SkRect::MakeXYWH(x, y, 70, 25)); |
| fModeRect[i] = SkRect::MakeXYWH(x, y + 28, 70, 2); |
| x += 80; |
| } |
| } |
| |
| public: |
| XferDemo() { |
| const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK }; |
| for (int i = 0; i < N; ++i) { |
| fDrs[i].reset(new CircDrawable(200, colors[i])); |
| fDrs[i]->fLoc.set(100.f + i * 100, 100.f + i * 100); |
| fDrs[i]->fMode = SkBlendMode::kSrcOver; |
| } |
| fSelected = nullptr; |
| |
| this->addButtons(); |
| } |
| |
| protected: |
| SkString name() override { return SkString("XferDemo"); } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| for (int i = 0; i < N_Modes; ++i) { |
| fModeButtons[i].draw(canvas); |
| } |
| |
| SkPaint paint; |
| if (fSelected) { |
| for (int i = 0; i < N_Modes; ++i) { |
| if (fSelected->fMode == gModes[i]) { |
| canvas->drawRect(fModeRect[i], paint); |
| break; |
| } |
| } |
| } |
| |
| canvas->saveLayer(nullptr, nullptr); |
| for (int i = 0; i < N; ++i) { |
| fDrs[i]->draw(canvas); |
| } |
| canvas->restore(); |
| } |
| |
| Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override { |
| // Check mode buttons first |
| for (int i = 0; i < N_Modes; ++i) { |
| if (fModeButtons[i].hitTest(x, y)) { |
| Click* click = new Click(); |
| click->fMeta.setS32("mode", i); |
| return click; |
| } |
| } |
| fSelected = nullptr; |
| for (int i = N - 1; i >= 0; --i) { |
| if (fDrs[i]->hitTest(x, y)) { |
| fSelected = fDrs[i].get(); |
| break; |
| } |
| } |
| return fSelected ? new Click() : nullptr; |
| } |
| |
| bool onClick(Click* click) override { |
| int32_t mode; |
| if (click->fMeta.findS32("mode", &mode)) { |
| if (fSelected && InputState::kUp == click->fState) { |
| fSelected->fMode = gModes[mode]; |
| } |
| } else { |
| fSelected->fLoc.fX += click->fCurr.fX - click->fPrev.fX; |
| fSelected->fLoc.fY += click->fCurr.fY - click->fPrev.fY; |
| } |
| return true; |
| } |
| |
| private: |
| typedef Sample INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_SAMPLE( return new XferDemo; ) |