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89 lines
2.5 KiB
89 lines
2.5 KiB
/* |
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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 "Sample.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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#include <cmath> |
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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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// See https://crbug.com/848616 |
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class GlyphTransformView : public Sample { |
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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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bool onQuery(Sample::Event* evt) override { |
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if (Sample::TitleQ(*evt)) { |
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Sample::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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SkFont font(fEmojiFont.fTypeface); |
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const char* text = fEmojiFont.fText; |
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double baseline = this->height() / 2; |
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canvas->drawLine(0, baseline, this->width(), baseline, paint); |
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SkMatrix ctm; |
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ctm.setRotate(fRotate); // d3 rotate takes degrees |
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ctm.postScale(fScale * 4, fScale * 4); |
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ctm.postTranslate(fTranslate.fX + this->width() * 0.8, fTranslate.fY + baseline); |
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canvas->concat(ctm); |
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// d3 by default anchors text around the middle |
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SkRect bounds; |
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font.measureText(text, strlen(text), kUTF8_SkTextEncoding, &bounds); |
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canvas->drawSimpleText(text, strlen(text), kUTF8_SkTextEncoding, -bounds.centerX(), -bounds.centerY(), |
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font, paint); |
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} |
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bool onAnimate(const SkAnimTimer& timer) override { |
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constexpr SkScalar maxt = 100000; |
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double t = timer.pingPong(20, 0, 0, maxt); // d3 t is in milliseconds |
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fTranslate.set(sin(t / 3000) - t * this->width() * 0.7 / maxt, sin(t / 999) / t); |
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fScale = 4.5 - std::sqrt(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 Sample INHERITED; |
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}; |
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////////////////////////////////////////////////////////////////////////////// |
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DEF_SAMPLE( return new GlyphTransformView(); )
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