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- /*
- * Copyright 2014 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/SkPictureRecorder.h"
- #include "include/utils/SkInterpolator.h"
- #include "include/utils/SkRandom.h"
- #include "samplecode/Sample.h"
- #include "src/core/SkPointPriv.h"
- #include "tools/timer/TimeUtils.h"
- const SkRect gUnitSquare = { -1, -1, 1, 1 };
- static void color_to_floats(SkColor c, SkScalar f[4]) {
- f[0] = SkIntToScalar(SkColorGetA(c));
- f[1] = SkIntToScalar(SkColorGetR(c));
- f[2] = SkIntToScalar(SkColorGetG(c));
- f[3] = SkIntToScalar(SkColorGetB(c));
- }
- static SkColor floats_to_color(const SkScalar f[4]) {
- return SkColorSetARGB(SkScalarRoundToInt(f[0]),
- SkScalarRoundToInt(f[1]),
- SkScalarRoundToInt(f[2]),
- SkScalarRoundToInt(f[3]));
- }
- static bool oval_contains(const SkRect& r, SkScalar x, SkScalar y) {
- SkMatrix m;
- m.setRectToRect(r, gUnitSquare, SkMatrix::kFill_ScaleToFit);
- SkPoint pt;
- m.mapXY(x, y, &pt);
- return SkPointPriv::LengthSqd(pt) <= 1;
- }
- static SkColor rand_opaque_color(uint32_t seed) {
- SkRandom rand(seed);
- return rand.nextU() | (0xFF << 24);
- }
- class HTDrawable : public SkDrawable {
- SkRect fR;
- SkColor fColor;
- SkInterpolator* fInterp;
- SkMSec fTime;
- public:
- HTDrawable(SkRandom& rand) {
- fR = SkRect::MakeXYWH(rand.nextRangeF(0, 640), rand.nextRangeF(0, 480),
- rand.nextRangeF(20, 200), rand.nextRangeF(20, 200));
- fColor = rand_opaque_color(rand.nextU());
- fInterp = nullptr;
- fTime = 0;
- }
- void spawnAnimation(SkMSec now) {
- this->setTime(now);
- delete fInterp;
- fInterp = new SkInterpolator(5, 3);
- SkScalar values[5];
- color_to_floats(fColor, values); values[4] = 0;
- fInterp->setKeyFrame(0, now, values);
- values[0] = 0; values[4] = 180;
- fInterp->setKeyFrame(1, now + 1000, values);
- color_to_floats(rand_opaque_color(fColor), values); values[4] = 360;
- fInterp->setKeyFrame(2, now + 2000, values);
- fInterp->setMirror(true);
- fInterp->setRepeatCount(3);
- this->notifyDrawingChanged();
- }
- bool hitTest(SkScalar x, SkScalar y) {
- return oval_contains(fR, x, y);
- }
- void setTime(SkMSec time) { fTime = time; }
- void onDraw(SkCanvas* canvas) override {
- SkAutoCanvasRestore acr(canvas, false);
- SkPaint paint;
- paint.setAntiAlias(true);
- if (fInterp) {
- SkScalar values[5];
- SkInterpolator::Result res = fInterp->timeToValues(fTime, values);
- fColor = floats_to_color(values);
- canvas->save();
- canvas->rotate(values[4], fR.centerX(), fR.centerY());
- switch (res) {
- case SkInterpolator::kFreezeEnd_Result:
- delete fInterp;
- fInterp = nullptr;
- break;
- default:
- break;
- }
- }
- paint.setColor(fColor);
- canvas->drawRect(fR, paint);
- }
- SkRect onGetBounds() override { return fR; }
- };
- class HTView : public Sample {
- public:
- enum {
- N = 50,
- W = 640,
- H = 480,
- };
- struct Rec {
- HTDrawable* fDrawable;
- };
- Rec fArray[N];
- sk_sp<SkDrawable> fRoot;
- SkMSec fTime;
- HTView() {
- SkRandom rand;
- SkPictureRecorder recorder;
- SkCanvas* canvas = recorder.beginRecording(SkRect::MakeWH(W, H));
- for (int i = 0; i < N; ++i) {
- fArray[i].fDrawable = new HTDrawable(rand);
- canvas->drawDrawable(fArray[i].fDrawable);
- fArray[i].fDrawable->unref();
- }
- fRoot = recorder.finishRecordingAsDrawable();
- }
- protected:
- SkString name() override { return SkString("HT"); }
- void onDrawContent(SkCanvas* canvas) override {
- canvas->drawDrawable(fRoot.get());
- }
- bool onAnimate(double nanos) override {
- fTime = TimeUtils::NanosToMSec(nanos);
- for (int i = 0; i < N; ++i) {
- fArray[i].fDrawable->setTime(fTime);
- }
- return true;
- }
- Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi) override {
- // search backwards to find the top-most
- for (int i = N - 1; i >= 0; --i) {
- if (fArray[i].fDrawable->hitTest(x, y)) {
- fArray[i].fDrawable->spawnAnimation(fTime);
- break;
- }
- }
- return nullptr;
- }
- private:
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new HTView(); )
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