add sample effects

git-svn-id: http://skia.googlecode.com/svn/trunk@180 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 113 insertions, 0 deletions

diff --git a/samplecode/SampleEffects.cpp b/samplecode/SampleEffects.cpp
new file mode 100644
index 0000000000..507f727228
--- /dev/null
+++ b/samplecode/SampleEffects.cpp
@@ -0,0 +1,113 @@
+#include "SampleCode.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkPorterDuff.h"
+#include "SkView.h"
+
+#include "SkBlurMaskFilter.h"
+#include "SkColorMatrixFilter.h"
+#include "SkDiscretePathEffect.h"
+#include "SkGradientShader.h"
+
+//#define COLOR 0xFFFF8844
+#define COLOR 0xFF888888
+
+static void paint_proc0(SkPaint* paint) {
+}
+
+static void paint_proc1(SkPaint* paint) {
+    paint->setMaskFilter(SkBlurMaskFilter::Create(2,
+                                SkBlurMaskFilter::kNormal_BlurStyle))->unref();
+}
+
+static void paint_proc2(SkPaint* paint) {
+    SkScalar dir[3] = { 1, 1, 1};
+    paint->setMaskFilter(
+                     SkBlurMaskFilter::CreateEmboss(dir, 0.1, 0.05, 1))->unref();
+}
+
+static void paint_proc3(SkPaint* paint) {
+    SkColor colors[] = { SK_ColorRED, COLOR, SK_ColorBLUE };
+    SkPoint pts[] = { 3, 0, 7, 5 };
+    paint->setShader(SkGradientShader::CreateLinear(pts, colors, NULL, SK_ARRAY_COUNT(colors),
+                                        SkShader::kMirror_TileMode))->unref();
+}
+
+static void paint_proc5(SkPaint* paint) {
+    paint_proc3(paint);
+    paint_proc2(paint);
+}
+
+typedef void (*PaintProc)(SkPaint*);
+const PaintProc gPaintProcs[] = {
+    paint_proc0,
+    paint_proc1,
+    paint_proc2,
+    paint_proc3,
+    paint_proc5,
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+class EffectsView : public SkView {
+public:
+    SkPath fPath;
+    SkPaint fPaint[SK_ARRAY_COUNT(gPaintProcs)];
+
+	EffectsView() {
+        size_t i;
+        const float pts[] = {
+            0, 0,
+            10, 0,
+            10, 5,
+            20, -5,
+            10, -15,
+            10, -10,
+            0, -10
+        };
+        fPath.moveTo(pts[0], pts[1]);
+        for (i = 2; i < SK_ARRAY_COUNT(pts); i += 2) {
+            fPath.lineTo(pts[i], pts[i+1]);
+        }
+        
+        for (i = 0; i < SK_ARRAY_COUNT(gPaintProcs); i++) {
+            fPaint[i].setAntiAlias(true);
+            fPaint[i].setColor(COLOR);
+            gPaintProcs[i](&fPaint[i]);
+        }
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "Effects");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(0xFFDDDDDD);
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+
+        canvas->scale(3, 3);
+        canvas->translate(10, 30);
+        for (size_t i = 0; i < SK_ARRAY_COUNT(fPaint); i++) {
+            canvas->drawPath(fPath, fPaint[i]);
+            canvas->translate(32, 0);
+        }
+    }
+    
+private:
+    typedef SkView INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new EffectsView; }
+static SkViewRegister reg(MyFactory);
+