From 8a1c16ff38322f0210116fa7293eb8817c7e477e Mon Sep 17 00:00:00 2001
From: "reed@android.com"
 <reed@android.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Date: Wed, 17 Dec 2008 15:59:43 +0000
Subject: grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
---
 samplecode/SampleCircle.cpp | 137 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 samplecode/SampleCircle.cpp

(limited to 'samplecode/SampleCircle.cpp')

diff --git a/samplecode/SampleCircle.cpp b/samplecode/SampleCircle.cpp
new file mode 100644
index 0000000000..bfb92d4930
--- /dev/null
+++ b/samplecode/SampleCircle.cpp
@@ -0,0 +1,137 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkDevice.h"
+#include "SkPaint.h"
+
+// ensure that we don't accidentally screw up the bounds when the oval is
+// fractional, and the impl computes the center and radii, and uses them to
+// reconstruct the edges of the circle.
+// see bug# 1504910
+static void test_circlebounds(SkCanvas* canvas) {
+#ifdef SK_SCALAR_IS_FLOAT
+    SkRect r = { 1.39999998, 1, 21.3999996, 21 };
+    SkPath p;
+    p.addOval(r);
+    SkRect r2;
+    p.computeBounds(&r2, SkPath::kFast_BoundsType);
+    SkASSERT(r == r2);
+#endif
+}
+
+class CircleView : public SkView {
+public:
+    static const SkScalar ANIM_DX = SK_Scalar1 / 67;
+    static const SkScalar ANIM_DY = SK_Scalar1 / 29;
+    static const SkScalar ANIM_RAD = SK_Scalar1 / 19;
+    SkScalar fDX, fDY, fRAD;
+
+    CircleView() {
+        fDX = fDY = fRAD = 0;
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "Circles");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorWHITE);
+    }
+    
+    void circle(SkCanvas* canvas, int width, bool aa) {
+        SkPaint paint;
+        
+        paint.setAntiAlias(aa);
+        if (width < 0) {
+            paint.setStyle(SkPaint::kFill_Style);
+        } else {
+            paint.setStyle(SkPaint::kStroke_Style);
+            paint.setStrokeWidth(SkIntToScalar(width));
+        }
+        canvas->drawCircle(0, 0, SkIntToScalar(9) + fRAD, paint);
+    }
+    
+    void drawSix(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
+        for (int width = -1; width <= 1; width++) {
+            canvas->save();
+            circle(canvas, width, false);
+            canvas->translate(0, dy);
+            circle(canvas, width, true);
+            canvas->restore();
+            canvas->translate(dx, 0);
+        }
+    }
+    
+    static void blowup(SkCanvas* canvas, const SkIRect& src, const SkRect& dst) {
+        SkDevice* device = canvas->getDevice();
+        const SkBitmap& bm = device->accessBitmap(false);
+        canvas->drawBitmapRect(bm, &src, dst, NULL);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+        
+        test_circlebounds(canvas);
+        
+        if (false) {
+          //  canvas->translate(SK_ScalarHalf, SK_ScalarHalf);
+
+            SkPaint paint;
+            paint.setAntiAlias(true);
+            paint.setStyle(SkPaint::kStroke_Style);
+            canvas->drawCircle(SkIntToScalar(10), SkIntToScalar(10), SkIntToScalar(2), paint);
+            
+            SkIRect r;
+            r.set(7, 7, 13, 13);
+            SkRect dst;
+            dst.set(SkIntToScalar(100), SkIntToScalar(10), SkIntToScalar(200), SkIntToScalar(110));
+            blowup(canvas, r, dst);
+            return;
+        }
+        
+        // test that degenerate rects do nothing
+        if (true) {
+            SkScalar x = SkIntToScalar(30);
+            SkRect  r;
+            r.set(x, x, x, x);
+            SkPaint p;
+            canvas->drawRect(r, p);
+            p.setAntiAlias(true);
+            canvas->drawRect(r, p);
+        }
+
+        SkScalar dx = SkIntToScalar(32);
+        SkScalar dy = SkIntToScalar(32);
+        
+        canvas->translate(dx + fDX, dy + fDY);
+        drawSix(canvas, dx, dy);
+
+        canvas->translate(dx, 0);
+        canvas->translate(SK_ScalarHalf, SK_ScalarHalf);
+        drawSix(canvas, dx, dy);
+        
+        fDX += ANIM_DX;
+        fDY += ANIM_DY;
+        fRAD += ANIM_RAD;
+        this->inval(NULL);
+    }
+    
+private:
+    typedef SkView INHERITED;
+};
+
+const SkScalar CircleView::ANIM_DX;
+const SkScalar CircleView::ANIM_DY;
+const SkScalar CircleView::ANIM_RAD;
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new CircleView; }
+static SkViewRegister reg(MyFactory);
+
-- 
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