grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleArc.cpp b/samplecode/SampleArc.cpp
new file mode 100644
index 0000000..7bc862b
--- /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);
+