grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SamplePolyToPoly.cpp b/samplecode/SamplePolyToPoly.cpp
new file mode 100644
index 0000000..98e4484
--- /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);
+