skia2/samplecode/SampleXfer.cpp

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/*
* 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 "SampleCode.h"
#include "SkAnimTimer.h"
#include "SkDrawable.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkDrawable.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRSXform.h"
#include "SkString.h"
#include "SkSurface.h"
#include "SkGradientShader.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);
paint.setTextSize(16);
paint.setTextAlign(SkPaint::kCenter_Align);
paint.setLCDRenderText(true);
canvas->drawString(fLabel, fRect.centerX(), fRect.fTop + 0.68f * fRect.height(), paint);
}
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,
SkShader::kClamp_TileMode));
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 SampleView {
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:
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "XferDemo");
return true;
}
return this->INHERITED::onQuery(evt);
}
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();
}
SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
// Check mode buttons first
for (int i = 0; i < N_Modes; ++i) {
if (fModeButtons[i].hitTest(x, y)) {
Click* click = new Click(this);
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(this) : nullptr;
}
bool onClick(Click* click) override {
int32_t mode;
if (click->fMeta.findS32("mode", &mode)) {
if (fSelected && Click::kUp_State == 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 SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new XferDemo; )