/* * 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 // 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 fTypeface; const char* fText; } fEmojiFont; SkVector fTranslate; SkScalar fScale; SkScalar fRotate; typedef Sample INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_SAMPLE( return new GlyphTransformView(); )