41248071ac
gm, slides, and samples no longer need to know about the implementation
details of AnimTimer.
This
virtual bool onAnimate(const AnimTimer&);
becomes this:
virtual bool onAnimate(double /*nanoseconds*/);
which is much easier to reason about.
AnimTimer itself is now part of viewer.
Change-Id: Ib70bf7a0798b1991f25204ae84f70463cdbeb358
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/226838
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColorFilter.h"
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#include "include/core/SkColorPriv.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkTime.h"
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#include "include/core/SkTypeface.h"
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#include "include/utils/SkRandom.h"
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#include "samplecode/Sample.h"
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#include "tools/timer/Timer.h"
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#if SK_SUPPORT_GPU
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#include "include/gpu/GrContext.h"
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#endif
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// Create an animation of a bunch of letters that rotate in place. This is intended to stress
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// the glyph atlas and test that we don't see corruption or bad slowdowns.
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class FlutterAnimateView : public Sample {
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public:
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FlutterAnimateView() : fCurrTime(0), fResetTime(0) {}
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protected:
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void onOnceBeforeDraw() override {
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fTypeface = SkTypeface::MakeFromFile("/skimages/samplefont.ttf");
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initChars();
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}
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SkString name() override { return SkString("FlutterAnimate"); }
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void onDrawContent(SkCanvas* canvas) override {
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SkFont font(fTypeface, 50);
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SkPaint paint;
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paint.setFilterQuality(kMedium_SkFilterQuality);
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// rough center of each glyph
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static constexpr auto kMidX = 35;
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static constexpr auto kMidY = 50;
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canvas->clear(SK_ColorWHITE);
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for (int i = 0; i < kNumChars; ++i) {
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canvas->save();
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double rot = SkScalarInterp(fChars[i].fStartRotation, fChars[i].fEndRotation,
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fCurrTime/kDuration);
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canvas->translate(fChars[i].fPosition.fX + kMidX, fChars[i].fPosition.fY - kMidY);
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canvas->rotate(SkRadiansToDegrees(rot));
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canvas->translate(-35,+50);
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canvas->drawString(fChars[i].fChar, 0, 0, font, paint);
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canvas->restore();
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}
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}
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bool onAnimate(double nanos) override {
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fCurrTime = 1e-9 * nanos - fResetTime;
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if (fCurrTime > kDuration) {
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this->initChars();
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fResetTime = 1e-9 * nanos;
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fCurrTime = 0;
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}
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return true;
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}
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private:
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void initChars() {
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for (int i = 0; i < kNumChars; ++i) {
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char c = fRand.nextULessThan(26) + 65;
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fChars[i].fChar[0] = c;
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fChars[i].fChar[1] = '\0';
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fChars[i].fPosition = SkPoint::Make(fRand.nextF()*748 + 10, fRand.nextF()*1004 + 10);
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fChars[i].fStartRotation = fRand.nextF();
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fChars[i].fEndRotation = fRand.nextF() * 20 - 10;
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}
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}
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static constexpr double kDuration = 5.0;
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double fCurrTime;
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double fResetTime;
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SkRandom fRand;
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struct AnimatedChar {
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char fChar[2];
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SkPoint fPosition;
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SkScalar fStartRotation;
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SkScalar fEndRotation;
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};
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sk_sp<SkTypeface> fTypeface;
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static constexpr int kNumChars = 40;
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AnimatedChar fChars[kNumChars];
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typedef Sample INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_SAMPLE( return new FlutterAnimateView(); )
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