add sample for clipping
git-svn-id: http://skia.googlecode.com/svn/trunk@2446 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleClip.cpp b/samplecode/SampleClip.cpp
new file mode 100644
index 0000000..87ff0b6
--- /dev/null
+++ b/samplecode/SampleClip.cpp
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2011 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 "SkView.h"
+#include "SkCanvas.h"
+#include "SkColorPriv.h"
+#include "SkDevice.h"
+#include "SkPaint.h"
+#include "SkRandom.h"
+
+#define W 270
+#define H 200
+
+static void show_text(SkCanvas* canvas) {
+ SkRandom rand;
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setTextSize(SkIntToScalar(20));
+
+ for (int i = 0; i < 300; ++i) {
+ paint.setColor((SK_A32_MASK << SK_A32_SHIFT) | rand.nextU());
+ canvas->drawText("Hamburgefons", 12,
+ rand.nextSScalar1() * W, rand.nextSScalar1() * H,
+ paint);
+ }
+}
+
+static void show_geo(SkCanvas* canvas) {
+ SkRandom rand;
+ SkPaint paint;
+ paint.setAntiAlias(true);
+
+ for (int i = 0; i < 30; ++i) {
+ SkRect r;
+ SkPath p;
+
+ r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
+ rand.nextUScalar1() * W, rand.nextUScalar1() * H);
+ paint.setStyle(SkPaint::kFill_Style);
+ paint.setColor(rand.nextU());
+ canvas->drawRect(r, paint);
+
+ r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
+ rand.nextUScalar1() * W, rand.nextUScalar1() * H);
+ paint.setStyle(SkPaint::kStroke_Style);
+ paint.setColor(rand.nextU());
+ canvas->drawRect(r, paint);
+
+ r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
+ rand.nextUScalar1() * W, rand.nextUScalar1() * H);
+ paint.setStyle(SkPaint::kFill_Style);
+ paint.setColor(rand.nextU());
+ p.addOval(r);
+ canvas->drawPath(p, paint);
+ }
+}
+
+typedef void (*CanvasProc)(SkCanvas*);
+
+class ClipView : public SampleView {
+public:
+ ClipView() {
+ }
+
+ virtual ~ClipView() {
+ }
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "Clip");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ virtual void onDrawContent(SkCanvas* canvas) {
+ canvas->drawColor(SK_ColorLTGRAY);
+ canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
+
+ static const CanvasProc gProc[] = {
+ show_text, show_geo
+ };
+
+ SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) };
+ SkPath clipPath;
+ r.inset(SK_Scalar1 / 4, SK_Scalar1 / 4);
+ clipPath.addRoundRect(r, SkIntToScalar(16), SkIntToScalar(16));
+
+ for (int aa = 0; aa <= 1; ++aa) {
+ canvas->save();
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); ++i) {
+ canvas->save();
+ canvas->clipPath(clipPath);
+ canvas->drawColor(SK_ColorWHITE);
+ gProc[i](canvas);
+ canvas->restore();
+ canvas->translate(W * SK_Scalar1 * 8 / 7, 0);
+ }
+ canvas->restore();
+ canvas->translate(0, H * SK_Scalar1 * 8 / 7);
+ }
+ }
+
+private:
+ typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new ClipView; }
+static SkViewRegister reg(MyFactory);
+