1 files changed, 81 insertions, 0 deletions
diff --git a/samplecode/SampleGlyphTransform.cpp b/samplecode/SampleGlyphTransform.cpp
new file mode 100644
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+++ b/samplecode/SampleGlyphTransform.cpp
@@ -0,0 +1,81 @@
+/*
+ * 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.h"
+#include "sk_tool_utils.h"
+
+#include "SkAnimTimer.h"
+#include "SkCanvas.h"
+#include "SkPath.h"
+#include "SkRandom.h"
+#include "SkRRect.h"
+#include "SkTypeface.h"
+
+// Implementation in C++ of Animated Emoji
+// See https://t.d3fc.io/status/705212795936247808
+
+class GlyphTransformView : public SampleView {
+public:
+    GlyphTransformView() {}
+
+protected:
+    void onOnceBeforeDraw() override {
+        fEmojiFont.fTypeface = sk_tool_utils::emoji_typeface();
+        fEmojiFont.fText = sk_tool_utils::emoji_sample_text();
+    }
+
+    // overrides from SkEventSink
+    bool onQuery(SkEvent* evt) override {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "Glyph Transform");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+
+    void onDrawContent(SkCanvas* canvas) override {
+        SkPaint paint;
+        paint.setTypeface(fEmojiFont.fTypeface);
+        const char* text = fEmojiFont.fText;
+
+        canvas->scale(4, 4);
+
+        canvas->drawLine(0, 200, 600, 200, paint);
+        SkMatrix ctm;
+        ctm.setRotate(SkRadiansToDegrees(fRotate));
+        ctm.postScale(fScale, fScale);
+        ctm.postTranslate(fTranslate.fX, fTranslate.fY);
+        canvas->concat(ctm);
+        canvas->drawString(text, 0, 0, paint);
+    }
+
+    bool onAnimate(const SkAnimTimer& timer) override {
+        double t = timer.secs();
+
+        fTranslate.set(99 + sin(t / 3.0e3) - t / 1024, 200 + sin(t / 999) / t);
+        fScale = 4.5 - t*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 SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new GlyphTransformView; }
+static SkViewRegister reg(MyFactory);