diff options
Diffstat (limited to 'samplecode/SamplePath.cpp')
| -rw-r--r-- | samplecode/SamplePath.cpp | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/samplecode/SamplePath.cpp b/samplecode/SamplePath.cpp index 11b4167ac6..f523fe6ef3 100644 --- a/samplecode/SamplePath.cpp +++ b/samplecode/SamplePath.cpp @@ -590,6 +590,7 @@ public: SkPoint* fQuad = fPts + 4; SkScalar fT = 0.5f; bool fShowSub = false; + bool fShowFlatness = false; CubicCurve2() { fPts[0] = { 90, 300 }; @@ -612,6 +613,7 @@ protected: if (SampleCode::CharQ(*evt, &uni)) { switch (uni) { case 's': fShowSub = !fShowSub; break; + case 'f': fShowFlatness = !fShowFlatness; break; case '-': fT -= 1.0f / 32; break; case '=': fT += 1.0f / 32; break; default: goto DONE; @@ -645,6 +647,29 @@ protected: canvas->drawCircle(storage[i].fX, storage[i].fY, 4, paint); } } + + void showFlattness(SkCanvas* canvas) { + SkPaint paint; + paint.setStyle(SkPaint::kStroke_Style); + paint.setAntiAlias(true); + + paint.setColor(0xFF888888); + canvas->drawLine(fPts[0], fPts[3], paint); + canvas->drawLine(fQuad[0], fQuad[2], paint); + + paint.setColor(0xFF0000FF); + SkPoint pts[2]; + pts[0] = (fQuad[0] + fQuad[1] + fQuad[1] + fQuad[2])*0.25; + pts[1] = (fQuad[0] + fQuad[2]) * 0.5; + canvas->drawLine(pts[0], pts[1], paint); + + SkVector v = fPts[0] - fPts[1] - fPts[1] + fPts[2]; + v = v * 0.75; + canvas->drawLine(fPts[1], fPts[1] + v, paint); + v = fPts[1] - fPts[2] - fPts[2] + fPts[3]; + v = v * 0.75; + canvas->drawLine(fPts[2], fPts[2] + v, paint); + } void onDrawContent(SkCanvas* canvas) override { SkPaint paint; @@ -674,6 +699,10 @@ protected: canvas->drawText(str.c_str(), str.size(), 20, 20, paint); } + if (fShowFlatness) { + this->showFlattness(canvas); + } + paint.setStyle(SkPaint::kFill_Style); paint.setColor(SK_ColorRED); for (SkPoint p : fPts) { |