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/SampleArc.cpp | 187 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 187 insertions(+)
 create mode 100644 samplecode/SampleArc.cpp

(limited to 'samplecode/SampleArc.cpp')

diff --git a/samplecode/SampleArc.cpp b/samplecode/SampleArc.cpp
new file mode 100644
index 0000000000..7bc862bafe
--- /dev/null
+++ b/samplecode/SampleArc.cpp
@@ -0,0 +1,187 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkPath.h"
+#include "SkRegion.h"
+#include "SkShader.h"
+#include "SkUtils.h"
+#include "SkShaderExtras.h"
+#include "Sk1DPathEffect.h"
+#include "SkCornerPathEffect.h"
+#include "SkPathMeasure.h"
+#include "SkRandom.h"
+#include "SkColorPriv.h"
+#include "SkColorFilter.h"
+#include "SkPorterDuff.h"
+#include "SkLayerRasterizer.h"
+
+class ArcsView : public SkView {
+public:
+	ArcsView()
+    {
+        fSweep = SkIntToScalar(100);
+    }
+
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt)
+    {
+        if (SampleCode::TitleQ(*evt))
+        {
+            SampleCode::TitleR(evt, "Arcs");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas)
+    {
+        canvas->drawColor(0xFFDDDDDD);
+    }
+    
+    static void drawRectWithLines(SkCanvas* canvas, const SkRect& r, const SkPaint& p)
+    {
+        canvas->drawRect(r, p);
+        canvas->drawLine(r.fLeft, r.fTop, r.fRight, r.fBottom, p);
+        canvas->drawLine(r.fLeft, r.fBottom, r.fRight, r.fTop, p);
+        canvas->drawLine(r.fLeft, r.centerY(), r.fRight, r.centerY(), p);
+        canvas->drawLine(r.centerX(), r.fTop, r.centerX(), r.fBottom, p);
+    }
+    
+    static void draw_label(SkCanvas* canvas, const SkRect& rect,
+                            int start, int sweep)
+    {
+        SkPaint paint;
+        
+        paint.setAntiAlias(true);
+        paint.setTextAlign(SkPaint::kCenter_Align);
+        
+        SkString    str;
+        
+        str.appendS32(start);
+        str.append(", ");
+        str.appendS32(sweep);
+        canvas->drawText(str.c_str(), str.size(), rect.centerX(),
+                         rect.fBottom + paint.getTextSize() * 5/4, paint);
+    }
+    
+    static void drawArcs(SkCanvas* canvas)
+    {
+        SkPaint paint;
+        SkRect  r;
+        SkScalar w = SkIntToScalar(75);
+        SkScalar h = SkIntToScalar(50);
+
+        r.set(0, 0, w, h);
+        paint.setAntiAlias(true);
+        paint.setStyle(SkPaint::kStroke_Style);
+        
+        canvas->save();
+        canvas->translate(SkIntToScalar(10), SkIntToScalar(300));
+        
+        paint.setStrokeWidth(SkIntToScalar(1));
+        
+        static const int gAngles[] = {
+            0, 360,
+            0, 45,
+            0, -45,
+            720, 135,
+            -90, 269,
+            -90, 270,
+            -90, 271,
+            -180, -270,
+            225, 90
+        };
+        
+        for (int i = 0; i < SK_ARRAY_COUNT(gAngles); i += 2)
+        {
+            paint.setColor(SK_ColorBLACK);
+            drawRectWithLines(canvas, r, paint);
+
+            paint.setColor(SK_ColorRED);
+            canvas->drawArc(r, SkIntToScalar(gAngles[i]),
+                            SkIntToScalar(gAngles[i+1]), false, paint);
+            
+            draw_label(canvas, r, gAngles[i], gAngles[i+1]);
+
+            canvas->translate(w * 8 / 7, 0);
+        }
+        
+        canvas->restore();
+    }
+    
+    virtual void onDraw(SkCanvas* canvas)
+    {
+        this->drawBG(canvas);
+
+        SkRect  r;
+        SkPaint paint;
+        
+        paint.setAntiAlias(true);
+        paint.setStrokeWidth(SkIntToScalar(2));
+        paint.setStyle(SkPaint::kStroke_Style);
+        
+        r.set(0, 0, SkIntToScalar(200), SkIntToScalar(200));
+        r.offset(SkIntToScalar(20), SkIntToScalar(20));
+        
+        if (false) {
+            const SkScalar d = SkIntToScalar(3);
+            const SkScalar rad[] = { d, d, d, d, d, d, d, d };
+            SkPath path;
+            path.addRoundRect(r, rad);
+            canvas->drawPath(path, paint);
+            return;
+        }
+
+        drawRectWithLines(canvas, r, paint);
+        
+   //     printf("----- sweep %g %X\n", SkScalarToFloat(fSweep), SkDegreesToRadians(fSweep));
+        
+        
+        paint.setStyle(SkPaint::kFill_Style);
+        paint.setColor(0x800000FF);
+        canvas->drawArc(r, 0, fSweep, true, paint);
+
+        paint.setColor(0x800FF000);
+        canvas->drawArc(r, 0, fSweep, false, paint);
+
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setColor(SK_ColorRED);
+        canvas->drawArc(r, 0, fSweep, true, paint);
+        
+        paint.setStrokeWidth(0);
+        paint.setColor(SK_ColorBLUE);
+        canvas->drawArc(r, 0, fSweep, false, paint);
+        
+        fSweep += SK_Scalar1/4;
+        if (fSweep > SkIntToScalar(360))
+            fSweep = 0;
+        
+        drawArcs(canvas);
+        this->inval(NULL);
+    }
+    
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) 
+    {
+     //   fSweep += SK_Scalar1;
+        this->inval(NULL);
+        return this->INHERITED::onFindClickHandler(x, y);
+    }
+    
+    virtual bool onClick(Click* click) 
+    {
+        return this->INHERITED::onClick(click);
+    }
+    
+private:
+    SkScalar fSweep;
+
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new ArcsView; }
+static SkViewRegister reg(MyFactory);
+
-- 
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