| /* |
| * Copyright 2017 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkTypes.h" |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPath.h" |
| #include "samplecode/Sample.h" |
| #include "src/core/SkGeometry.h" |
| |
| enum class VerbType { |
| kTriangles, |
| kQuadratics, |
| kCubics, |
| kConics |
| }; |
| |
| static const char* verb_type_name(VerbType verbType) { |
| switch (verbType) { |
| case VerbType::kTriangles: return "kTriangles"; |
| case VerbType::kQuadratics: return "kQuadratics"; |
| case VerbType::kCubics: return "kCubics"; |
| case VerbType::kConics: return "kConics"; |
| } |
| SkUNREACHABLE; |
| }; |
| |
| /** |
| * This sample visualizes simple strokes. |
| */ |
| class StrokeVerbView : public Sample { |
| void onOnceBeforeDraw() override { this->updatePath(); } |
| void onDrawContent(SkCanvas*) override; |
| |
| Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override; |
| bool onClick(Sample::Click*) override; |
| bool onChar(SkUnichar) override; |
| SkString name() override { return SkString("StrokeVerb"); } |
| |
| class Click; |
| |
| void updateAndInval() { this->updatePath(); } |
| |
| void updatePath(); |
| |
| VerbType fVerbType = VerbType::kCubics; |
| |
| SkPoint fPoints[4] = { |
| {100.05f, 100.05f}, {400.75f, 100.05f}, {400.75f, 300.95f}, {100.05f, 300.95f}}; |
| |
| float fConicWeight = .5; |
| float fStrokeWidth = 40; |
| SkPaint::Join fStrokeJoin = SkPaint::kMiter_Join; |
| SkPaint::Cap fStrokeCap = SkPaint::kButt_Cap; |
| |
| SkPath fPath; |
| }; |
| |
| void StrokeVerbView::onDrawContent(SkCanvas* canvas) { |
| canvas->clear(SK_ColorBLACK); |
| |
| SkPaint outlinePaint; |
| outlinePaint.setColor(0xff808080); |
| outlinePaint.setStyle(SkPaint::kStroke_Style); |
| outlinePaint.setStrokeWidth(fStrokeWidth); |
| outlinePaint.setStrokeJoin(fStrokeJoin); |
| outlinePaint.setStrokeCap(fStrokeCap); |
| outlinePaint.setAntiAlias(true); |
| canvas->drawPath(fPath, outlinePaint); |
| |
| SkString caption; |
| caption.appendf("VerbType_%s", verb_type_name(fVerbType)); |
| if (VerbType::kCubics == fVerbType) { |
| caption.appendf(" (%s)", SkCubicTypeName(SkClassifyCubic(fPoints))); |
| } else if (VerbType::kConics == fVerbType) { |
| caption.appendf(" (w=%f)", fConicWeight); |
| } |
| |
| caption.appendf(" (stroke_width=%f)", fStrokeWidth); |
| |
| SkPaint pointsPaint; |
| pointsPaint.setColor(SK_ColorBLUE); |
| pointsPaint.setStrokeWidth(8); |
| pointsPaint.setAntiAlias(true); |
| |
| if (VerbType::kCubics == fVerbType) { |
| canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, fPoints, pointsPaint); |
| } else { |
| canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, fPoints, pointsPaint); |
| canvas->drawPoints(SkCanvas::kPoints_PointMode, 1, fPoints + 3, pointsPaint); |
| } |
| |
| SkFont font(nullptr, 20); |
| SkPaint captionPaint; |
| captionPaint.setColor(SK_ColorWHITE); |
| canvas->drawString(caption, 10, 30, font, captionPaint); |
| } |
| |
| void StrokeVerbView::updatePath() { |
| fPath.reset(); |
| fPath.moveTo(fPoints[0]); |
| switch (fVerbType) { |
| case VerbType::kCubics: |
| fPath.cubicTo(fPoints[1], fPoints[2], fPoints[3]); |
| break; |
| case VerbType::kQuadratics: |
| fPath.quadTo(fPoints[1], fPoints[3]); |
| break; |
| case VerbType::kConics: |
| fPath.conicTo(fPoints[1], fPoints[3], fConicWeight); |
| break; |
| case VerbType::kTriangles: |
| fPath.lineTo(fPoints[1]); |
| fPath.lineTo(fPoints[3]); |
| fPath.close(); |
| break; |
| } |
| } |
| |
| class StrokeVerbView::Click : public Sample::Click { |
| public: |
| Click(int ptIdx) : fPtIdx(ptIdx) {} |
| |
| void doClick(SkPoint points[]) { |
| if (fPtIdx >= 0) { |
| points[fPtIdx] += fCurr - fPrev; |
| } else { |
| for (int i = 0; i < 4; ++i) { |
| points[i] += fCurr - fPrev; |
| } |
| } |
| } |
| |
| private: |
| int fPtIdx; |
| }; |
| |
| Sample::Click* StrokeVerbView::onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) { |
| for (int i = 0; i < 4; ++i) { |
| if (VerbType::kCubics != fVerbType && 2 == i) { |
| continue; |
| } |
| if (fabs(x - fPoints[i].x()) < 20 && fabsf(y - fPoints[i].y()) < 20) { |
| return new Click(i); |
| } |
| } |
| return new Click(-1); |
| } |
| |
| bool StrokeVerbView::onClick(Sample::Click* click) { |
| Click* myClick = (Click*)click; |
| myClick->doClick(fPoints); |
| this->updateAndInval(); |
| return true; |
| } |
| |
| bool StrokeVerbView::onChar(SkUnichar unichar) { |
| if (unichar >= '1' && unichar <= '4') { |
| fVerbType = VerbType(unichar - '1'); |
| this->updateAndInval(); |
| return true; |
| } |
| float* valueToScale = nullptr; |
| if (VerbType::kConics == fVerbType) { |
| valueToScale = &fConicWeight; |
| } else { |
| valueToScale = &fStrokeWidth; |
| } |
| if (valueToScale) { |
| if (unichar == '+') { |
| *valueToScale *= 2; |
| this->updateAndInval(); |
| return true; |
| } |
| if (unichar == '+' || unichar == '=') { |
| *valueToScale *= 5/4.f; |
| this->updateAndInval(); |
| return true; |
| } |
| if (unichar == '-') { |
| *valueToScale *= 4/5.f; |
| this->updateAndInval(); |
| return true; |
| } |
| if (unichar == '_') { |
| *valueToScale *= .5f; |
| this->updateAndInval(); |
| return true; |
| } |
| } |
| if (unichar == 'D') { |
| SkDebugf(" SkPoint fPoints[4] = {\n"); |
| SkDebugf(" {%ff, %ff},\n", fPoints[0].x(), fPoints[0].y()); |
| SkDebugf(" {%ff, %ff},\n", fPoints[1].x(), fPoints[1].y()); |
| SkDebugf(" {%ff, %ff},\n", fPoints[2].x(), fPoints[2].y()); |
| SkDebugf(" {%ff, %ff}\n", fPoints[3].x(), fPoints[3].y()); |
| SkDebugf(" };\n"); |
| return true; |
| } |
| if (unichar == 'J') { |
| fStrokeJoin = (SkPaint::Join)((fStrokeJoin + 1) % 3); |
| this->updateAndInval(); |
| return true; |
| } |
| if (unichar == 'C') { |
| fStrokeCap = (SkPaint::Cap)((fStrokeCap + 1) % 3); |
| this->updateAndInval(); |
| return true; |
| } |
| return false; |
| } |
| |
| DEF_SAMPLE(return new StrokeVerbView;) |
| |
| #endif // SK_SUPPORT_GPU |