grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 165 insertions, 0 deletions

diff --git a/samplecode/SamplePolyToPoly.cpp b/samplecode/SamplePolyToPoly.cpp
new file mode 100644
index 0000000000..98e4484b08
--- /dev/null
+++ b/samplecode/SamplePolyToPoly.cpp
@@ -0,0 +1,165 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGraphics.h"
+#include "SkPath.h"
+#include "SkRandom.h"
+#include "SkTime.h"
+
+extern bool SkSetPoly3To3(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]);
+
+class PolyToPolyView : public SkView {
+public:    
+	PolyToPolyView() {
+        // tests
+        {
+            SkPoint src[] = { 0, 0, SK_Scalar1, 0, 0, SK_Scalar1 };
+            SkPoint dst[] = { 0, 0, 2*SK_Scalar1, 0, 0, 2*SK_Scalar1 };
+            SkMatrix m1, m2;
+            bool success;
+            
+            success = m1.setPolyToPoly(src, dst, 3);
+            SkDebugf("--- setPolyToPoly1 %d\n", success);
+
+            m2.reset();            
+            m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
+            m2.set(SkMatrix::kMSkewX,  dst[2].fX - dst[0].fX);
+            m2.set(SkMatrix::kMTransX, dst[0].fX);
+            m2.set(SkMatrix::kMSkewY,  dst[1].fY - dst[0].fY);
+            m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
+            m2.set(SkMatrix::kMTransY, dst[0].fY);
+            
+            m1.reset();
+            
+            const SkScalar src1[] = {
+                0, 0, 0, SkFloatToScalar(427), SkFloatToScalar(316), SkFloatToScalar(427), SkFloatToScalar(316), 0
+            };
+            const SkScalar dst1[] = {
+                SkFloatToScalar(158), SkFloatToScalar(177.5f), SkFloatToScalar(158), SkFloatToScalar(249.5f),
+                SkFloatToScalar(158), SkFloatToScalar(604.5f), SkFloatToScalar(158), SkFloatToScalar(-177.5f)
+            };
+            
+            success = m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
+            SkDebugf("--- setPolyToPoly2 %d\n", success);
+            
+            {
+                const SkPoint src[] = {
+                    SkIntToScalar(1), SkIntToScalar(0),
+                    SkIntToScalar(4), SkIntToScalar(7),
+                    SkIntToScalar(10), SkIntToScalar(2)
+                };
+                const SkPoint dst[] = {
+                    SkIntToScalar(4), SkIntToScalar(2),
+                    SkIntToScalar(45), SkIntToScalar(26),
+                    SkIntToScalar(32), SkIntToScalar(17)
+                };
+                
+                SkMatrix m0, m1;
+                m0.setPolyToPoly(src, dst, 3);
+                SkSetPoly3To3(&m1, src, dst);
+                m0.dump();
+                m1.dump();
+            }
+        }
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt)  {
+        if (SampleCode::TitleQ(*evt)) {
+            SkString str("PolyToPolyView");
+            SampleCode::TitleR(evt, str.c_str());
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    void drawBG(SkCanvas* canvas) {
+        canvas->drawColor(SK_ColorWHITE);
+    }
+
+    static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
+                       const int idst[], int count) {
+        SkMatrix matrix;
+        SkPoint src[4], dst[4];
+        
+        for (int i = 0; i < count; i++) {
+            src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
+            dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
+        }
+        
+        canvas->save();
+        matrix.setPolyToPoly(src, dst, count);
+        canvas->concat(matrix);
+        
+        paint->setColor(SK_ColorGRAY);
+        paint->setStyle(SkPaint::kStroke_Style);
+        const SkScalar D = SkIntToScalar(64);
+        canvas->drawRectCoords(0, 0, D, D, *paint);
+        canvas->drawLine(0, 0, D, D, *paint);
+        canvas->drawLine(0, D, D, 0, *paint);
+        
+        SkPaint::FontMetrics fm;
+        paint->getFontMetrics(&fm);
+        paint->setColor(SK_ColorRED);
+        paint->setStyle(SkPaint::kFill_Style);
+        SkScalar x = D/2;
+        float y = D/2 - (fm.fAscent + fm.fDescent)/2;
+        SkString str;
+        str.appendS32(count);
+        canvas->drawText(str.c_str(), str.size(), x, y, *paint);
+        
+        canvas->restore();
+    }
+    
+    virtual void onDraw(SkCanvas* canvas) {
+        this->drawBG(canvas);
+        
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setStrokeWidth(SkIntToScalar(4));
+        paint.setTextSize(SkIntToScalar(40));
+        paint.setTextAlign(SkPaint::kCenter_Align);
+
+        canvas->save();
+        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
+        // translate (1 point)
+        const int src1[] = { 0, 0 };
+        const int dst1[] = { 5, 5 };
+        doDraw(canvas, &paint, src1, dst1, 1);
+        canvas->restore();
+        
+        canvas->save();
+        canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
+        // rotate/uniform-scale (2 points)
+        const int src2[] = { 32, 32, 64, 32 };
+        const int dst2[] = { 32, 32, 64, 48 };
+        doDraw(canvas, &paint, src2, dst2, 2);
+        canvas->restore();
+        
+        canvas->save();
+        canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
+        // rotate/skew (3 points)
+        const int src3[] = { 0, 0, 64, 0, 0, 64 };
+        const int dst3[] = { 0, 0, 96, 0, 24, 64 };
+        doDraw(canvas, &paint, src3, dst3, 3);
+        canvas->restore();
+        
+        canvas->save();
+        canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
+        // perspective (4 points)
+        const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
+        const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
+        doDraw(canvas, &paint, src4, dst4, 4);
+        canvas->restore();
+    }
+    
+private:
+    typedef SkView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new PolyToPolyView; }
+static SkViewRegister reg(MyFactory);
+