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git-svn-id: http://skia.googlecode.com/svn/trunk@1099 2bbb7eff-a529-9590-31e7-b0007b416f81

samplecode/SamplePathFill.cpp

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+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGraphics.h"
+#include "SkRandom.h"
+#include "SkBlurDrawLooper.h"
+#include "SkGradientShader.h"
+
+typedef SkScalar (*MakePathProc)(SkPath*);
+
+static SkScalar make_frame(SkPath* path) {
+    SkRect r = { 10, 10, 630, 470 };
+    path->addRoundRect(r, 15, 15);
+
+    SkPaint paint;
+    paint.setStyle(SkPaint::kStroke_Style);
+    paint.setStrokeWidth(5);
+    paint.getFillPath(*path, path);
+    return 15;
+}
+
+static SkScalar make_triangle(SkPath* path) {
+    static const int gCoord[] = {
+        10, 20, 15, 5, 30, 30
+    };
+    path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
+    path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
+    path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
+    path->close();
+    path->offset(10, 0);
+    return SkIntToScalar(30);
+}
+
+static SkScalar make_rect(SkPath* path) {
+    SkRect r = { 10, 10, 30, 30 };
+    path->addRect(r);
+    path->offset(10, 0);
+    return SkIntToScalar(30);
+}
+
+static SkScalar make_oval(SkPath* path) {
+    SkRect r = { 10, 10, 30, 30 };
+    path->addOval(r);
+    path->offset(10, 0);
+    return SkIntToScalar(30);
+}
+
+static SkScalar make_sawtooth(SkPath* path) {
+    SkScalar x = SkIntToScalar(20);
+    SkScalar y = SkIntToScalar(20);
+    const SkScalar x0 = x;
+    const SkScalar dx = SK_Scalar1 * 5;
+    const SkScalar dy = SK_Scalar1 * 10;
+    
+    path->moveTo(x, y);
+    for (int i = 0; i < 32; i++) {
+        x += dx;
+        path->lineTo(x, y - dy);
+        x += dx;
+        path->lineTo(x, y + dy);
+    }
+    path->lineTo(x, y + 2 * dy);
+    path->lineTo(x0, y + 2 * dy);
+    path->close();
+    return SkIntToScalar(30);
+}
+
+static SkScalar make_star(SkPath* path, int n) {
+    const SkScalar c = SkIntToScalar(45);
+    const SkScalar r = SkIntToScalar(20);
+
+    SkScalar rad = -SK_ScalarPI / 2;
+    const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
+
+    path->moveTo(c, c - r);
+    for (int i = 1; i < n; i++) {
+        rad += drad;
+        SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
+        path->lineTo(c + SkScalarMul(cosV, r), c + SkScalarMul(sinV, r));
+    }
+    path->close();
+    return r * 2 * 6 / 5;
+}
+
+static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
+static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }
+
+static const MakePathProc gProcs[] = {
+    make_frame,
+    make_triangle,
+    make_rect,
+    make_oval,
+    make_sawtooth,
+    make_star_5,
+    make_star_13
+};
+
+#define N   SK_ARRAY_COUNT(gProcs)
+
+class PathFillView : public SkView {
+    SkPath  fPath[N];
+    SkScalar fDY[N];
+
+public:
+    PathFillView() {
+        for (size_t i = 0; i < N; i++) {
+            fDY[i] = gProcs[i](&fPath[i]);
+        }
+    }
+
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "PathFill");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(0xFFDDDDDD);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+
+        SkPaint paint;
+        paint.setAntiAlias(true);
+
+        for (size_t i = 0; i < N; i++) {
+            canvas->drawPath(fPath[i], paint);
+            canvas->translate(0, fDY[i]);
+        }
+    }
+
+private:
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new PathFillView; }
+static SkViewRegister reg(MyFactory);
+