Add string art GM and sample.
BUG=279014
R=robertphillips@google.com
Review URL: https://codereview.chromium.org/23609037
git-svn-id: http://skia.googlecode.com/svn/trunk@11383 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleStringArt.cpp b/samplecode/SampleStringArt.cpp
new file mode 100644
index 0000000..c6547ed
--- /dev/null
+++ b/samplecode/SampleStringArt.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2013 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 "SkCanvas.h"
+
+// Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
+
+// Renders a string art shape.
+// The particular shape rendered can be controlled by clicking horizontally, thereby
+// generating an angle from 0 to 1.
+
+class StringArtView : public SampleView {
+public:
+ StringArtView() : fAngle(0.305f) {}
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "StringArt");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
+ SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
+
+ SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height()));
+ SkScalar length = 5;
+ SkScalar step = angle;
+
+ SkPath path;
+ path.moveTo(center);
+
+ while (length < (SkScalarHalf(SkMin32(this->width(), this->height())) - 10.f))
+ {
+ SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
+ length*SkScalarSin(step) + center.fY);
+ path.lineTo(rp);
+ length += SkScalarDiv(angle, SkScalarHalf(SK_ScalarPI));
+ step += angle;
+ }
+ path.close();
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setStyle(SkPaint::kStroke_Style);
+ paint.setColor(0xFF007700);
+
+ canvas->drawPath(path, paint);
+ }
+
+ virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) SK_OVERRIDE {
+ fAngle = x/width();
+ this->inval(NULL);
+ return NULL;
+ }
+private:
+
+ SkScalar fAngle;
+ typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new StringArtView; }
+static SkViewRegister reg(MyFactory);