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84 lines
2.4 KiB
84 lines
2.4 KiB
4 months ago
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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/Sample.h"
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#include "tools/ToolUtils.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkPath.h"
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#include "include/core/SkRRect.h"
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#include "include/core/SkTypeface.h"
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#include "include/utils/SkRandom.h"
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#include "tools/timer/TimeUtils.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 = ToolUtils::emoji_typeface();
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fEmojiFont.fText = ToolUtils::emoji_sample_text();
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}
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SkString name() override { return SkString("Glyph Transform"); }
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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), SkTextEncoding::kUTF8, &bounds);
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canvas->drawSimpleText(text, strlen(text), SkTextEncoding::kUTF8, -bounds.centerX(), -bounds.centerY(),
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font, paint);
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}
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bool onAnimate(double nanos) override {
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constexpr SkScalar maxt = 100000;
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double t = TimeUtils::PingPong(1e-9 * nanos, 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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using INHERITED = Sample;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_SAMPLE( return new GlyphTransformView(); )
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