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- /*
- * Copyright 2018 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "samplecode/Sample.h"
- #include "tools/ToolUtils.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkPath.h"
- #include "include/core/SkRRect.h"
- #include "include/core/SkTypeface.h"
- #include "include/utils/SkRandom.h"
- #include "tools/timer/TimeUtils.h"
- #include <cmath>
- // Implementation in C++ of Animated Emoji
- // See https://t.d3fc.io/status/705212795936247808
- // See https://crbug.com/848616
- class GlyphTransformView : public Sample {
- public:
- GlyphTransformView() {}
- protected:
- void onOnceBeforeDraw() override {
- fEmojiFont.fTypeface = ToolUtils::emoji_typeface();
- fEmojiFont.fText = ToolUtils::emoji_sample_text();
- }
- SkString name() override { return SkString("Glyph Transform"); }
- void onDrawContent(SkCanvas* canvas) override {
- SkPaint paint;
- SkFont font(fEmojiFont.fTypeface);
- const char* text = fEmojiFont.fText;
- double baseline = this->height() / 2;
- canvas->drawLine(0, baseline, this->width(), baseline, paint);
- SkMatrix ctm;
- ctm.setRotate(fRotate); // d3 rotate takes degrees
- ctm.postScale(fScale * 4, fScale * 4);
- ctm.postTranslate(fTranslate.fX + this->width() * 0.8, fTranslate.fY + baseline);
- canvas->concat(ctm);
- // d3 by default anchors text around the middle
- SkRect bounds;
- font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
- canvas->drawSimpleText(text, strlen(text), SkTextEncoding::kUTF8, -bounds.centerX(), -bounds.centerY(),
- font, paint);
- }
- bool onAnimate(double nanos) override {
- constexpr SkScalar maxt = 100000;
- double t = TimeUtils::PingPong(1e-9 * nanos, 20, 0, 0, maxt); // d3 t is in milliseconds
- fTranslate.set(sin(t / 3000) - t * this->width() * 0.7 / maxt, sin(t / 999) / t);
- fScale = 4.5 - std::sqrt(t) / 99;
- fRotate = sin(t / 734);
- return true;
- }
- private:
- struct EmojiFont {
- sk_sp<SkTypeface> fTypeface;
- const char* fText;
- } fEmojiFont;
- SkVector fTranslate;
- SkScalar fScale;
- SkScalar fRotate;
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new GlyphTransformView(); )
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