82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
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/*
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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 "SampleCode.h"
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#include "sk_tool_utils.h"
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#include "SkAnimTimer.h"
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#include "SkCanvas.h"
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#include "SkPath.h"
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#include "SkRandom.h"
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#include "SkRRect.h"
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#include "SkTypeface.h"
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// Implementation in C++ of Animated Emoji
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// See https://t.d3fc.io/status/705212795936247808
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class GlyphTransformView : public SampleView {
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public:
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GlyphTransformView() {}
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protected:
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void onOnceBeforeDraw() override {
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fEmojiFont.fTypeface = sk_tool_utils::emoji_typeface();
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fEmojiFont.fText = sk_tool_utils::emoji_sample_text();
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}
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// overrides from SkEventSink
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bool onQuery(SkEvent* evt) override {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "Glyph Transform");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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void onDrawContent(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setTypeface(fEmojiFont.fTypeface);
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const char* text = fEmojiFont.fText;
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canvas->scale(4, 4);
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canvas->drawLine(0, 200, 600, 200, paint);
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SkMatrix ctm;
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ctm.setRotate(SkRadiansToDegrees(fRotate));
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ctm.postScale(fScale, fScale);
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ctm.postTranslate(fTranslate.fX, fTranslate.fY);
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canvas->concat(ctm);
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canvas->drawString(text, 0, 0, paint);
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}
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bool onAnimate(const SkAnimTimer& timer) override {
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double t = timer.secs();
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fTranslate.set(99 + sin(t / 3.0e3) - t / 1024, 200 + sin(t / 999) / t);
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fScale = 4.5 - t*t / 99;
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fRotate = sin(t / 734);
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return true;
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}
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private:
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struct EmojiFont {
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sk_sp<SkTypeface> fTypeface;
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const char* fText;
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} fEmojiFont;
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SkVector fTranslate;
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SkScalar fScale;
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SkScalar fRotate;
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new GlyphTransformView; }
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static SkViewRegister reg(MyFactory);
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