| |
| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "SampleCode.h" |
| #include "SkView.h" |
| #include "SkCanvas.h" |
| #include "SkGradientShader.h" |
| #include "SkGraphics.h" |
| #include "SkImageDecoder.h" |
| #include "SkPath.h" |
| #include "SkRegion.h" |
| #include "SkShader.h" |
| #include "SkUtils.h" |
| #include "SkXfermode.h" |
| #include "SkColorPriv.h" |
| #include "SkColorFilter.h" |
| #include "SkTime.h" |
| #include "SkRandom.h" |
| |
| #include "SkLineClipper.h" |
| #include "SkEdgeClipper.h" |
| |
| #define AUTO_ANIMATE true |
| |
| static int test0(SkPoint pts[], SkRect* clip) { |
| pts[0].set(200000, 140); |
| pts[1].set(-740000, 483); |
| pts[2].set(SkFloatToScalar(1.00000102e-06f), |
| SkFloatToScalar(9.10000017e-05f)); |
| clip->set(0, 0, 640, 480); |
| return 2; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static void drawQuad(SkCanvas* canvas, const SkPoint pts[3], const SkPaint& p) { |
| SkPath path; |
| path.moveTo(pts[0]); |
| path.quadTo(pts[1], pts[2]); |
| canvas->drawPath(path, p); |
| } |
| |
| static void drawCubic(SkCanvas* canvas, const SkPoint pts[4], const SkPaint& p) { |
| SkPath path; |
| path.moveTo(pts[0]); |
| path.cubicTo(pts[1], pts[2], pts[3]); |
| canvas->drawPath(path, p); |
| } |
| |
| typedef void (*clipper_proc)(const SkPoint src[], const SkRect& clip, |
| SkCanvas*, const SkPaint&, const SkPaint&); |
| |
| static void check_clipper(int count, const SkPoint pts[], const SkRect& clip) { |
| for (int i = 0; i < count; i++) { |
| SkASSERT(pts[i].fX >= clip.fLeft); |
| SkASSERT(pts[i].fX <= clip.fRight); |
| SkASSERT(pts[i].fY >= clip.fTop); |
| SkASSERT(pts[i].fY <= clip.fBottom); |
| } |
| |
| if (count > 1) { |
| sk_assert_monotonic_y(pts, count); |
| } |
| } |
| |
| static void line_intersector(const SkPoint src[], const SkRect& clip, |
| SkCanvas* canvas, const SkPaint& p0, const SkPaint& p1) { |
| canvas->drawPoints(SkCanvas::kLines_PointMode, 2, src, p1); |
| |
| SkPoint dst[2]; |
| if (SkLineClipper::IntersectLine(src, clip, dst)) { |
| check_clipper(2, dst, clip); |
| canvas->drawPoints(SkCanvas::kLines_PointMode, 2, dst, p0); |
| } |
| } |
| |
| static void line_clipper(const SkPoint src[], const SkRect& clip, |
| SkCanvas* canvas, const SkPaint& p0, const SkPaint& p1) { |
| canvas->drawPoints(SkCanvas::kLines_PointMode, 2, src, p1); |
| |
| SkPoint dst[SkLineClipper::kMaxPoints]; |
| int count = SkLineClipper::ClipLine(src, clip, dst); |
| for (int i = 0; i < count; i++) { |
| check_clipper(2, &dst[i], clip); |
| canvas->drawPoints(SkCanvas::kLines_PointMode, 2, &dst[i], p0); |
| } |
| } |
| |
| static void quad_clipper(const SkPoint src[], const SkRect& clip, |
| SkCanvas* canvas, const SkPaint& p0, const SkPaint& p1) { |
| drawQuad(canvas, src, p1); |
| |
| SkEdgeClipper clipper; |
| if (clipper.clipQuad(src, clip)) { |
| SkPoint pts[4]; |
| SkPath::Verb verb; |
| while ((verb = clipper.next(pts)) != SkPath::kDone_Verb) { |
| switch (verb) { |
| case SkPath::kLine_Verb: |
| check_clipper(2, pts, clip); |
| canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p0); |
| break; |
| case SkPath::kQuad_Verb: |
| check_clipper(3, pts, clip); |
| drawQuad(canvas, pts, p0); |
| break; |
| default: |
| SkASSERT(!"unexpected verb"); |
| } |
| } |
| } |
| } |
| |
| static void cubic_clipper(const SkPoint src[], const SkRect& clip, |
| SkCanvas* canvas, const SkPaint& p0, const SkPaint& p1) { |
| drawCubic(canvas, src, p1); |
| |
| SkEdgeClipper clipper; |
| if (clipper.clipCubic(src, clip)) { |
| SkPoint pts[4]; |
| SkPath::Verb verb; |
| while ((verb = clipper.next(pts)) != SkPath::kDone_Verb) { |
| switch (verb) { |
| case SkPath::kLine_Verb: |
| check_clipper(2, pts, clip); |
| canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p0); |
| break; |
| case SkPath::kCubic_Verb: |
| // check_clipper(4, pts, clip); |
| drawCubic(canvas, pts, p0); |
| break; |
| default: |
| SkASSERT(!"unexpected verb"); |
| } |
| } |
| } |
| } |
| |
| static const clipper_proc gProcs[] = { |
| line_intersector, |
| line_clipper, |
| quad_clipper, |
| cubic_clipper |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| enum { |
| W = 640/3, |
| H = 480/3 |
| }; |
| |
| class LineClipperView : public SampleView { |
| SkMSec fNow; |
| int fCounter; |
| int fProcIndex; |
| SkRect fClip; |
| SkRandom fRand; |
| SkPoint fPts[4]; |
| |
| void randPts() { |
| for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) { |
| fPts[i].set(fRand.nextUScalar1() * 640, |
| fRand.nextUScalar1() * 480); |
| } |
| fCounter += 1; |
| } |
| |
| public: |
| LineClipperView() { |
| fProcIndex = 0; |
| fCounter = 0; |
| fNow = 0; |
| |
| int x = (640 - W)/2; |
| int y = (480 - H)/2; |
| fClip.set(SkIntToScalar(x), SkIntToScalar(y), |
| SkIntToScalar(x + W), SkIntToScalar(y + H)); |
| this->randPts(); |
| } |
| |
| protected: |
| // overrides from SkEventSink |
| virtual bool onQuery(SkEvent* evt) { |
| if (SampleCode::TitleQ(*evt)) { |
| SampleCode::TitleR(evt, "LineClipper"); |
| return true; |
| } |
| return this->INHERITED::onQuery(evt); |
| } |
| |
| static void drawVLine(SkCanvas* canvas, SkScalar x, const SkPaint& paint) { |
| canvas->drawLine(x, -999, x, 999, paint); |
| } |
| |
| static void drawHLine(SkCanvas* canvas, SkScalar y, const SkPaint& paint) { |
| canvas->drawLine(-999, y, 999, y, paint); |
| } |
| |
| virtual void onDrawContent(SkCanvas* canvas) { |
| SkMSec now = SampleCode::GetAnimTime(); |
| if (fNow != now) { |
| fNow = now; |
| this->randPts(); |
| this->inval(NULL); |
| } |
| |
| // fProcIndex = test0(fPts, &fClip); |
| |
| SkPaint paint, paint1; |
| |
| drawVLine(canvas, fClip.fLeft + SK_ScalarHalf, paint); |
| drawVLine(canvas, fClip.fRight - SK_ScalarHalf, paint); |
| drawHLine(canvas, fClip.fTop + SK_ScalarHalf, paint); |
| drawHLine(canvas, fClip.fBottom - SK_ScalarHalf, paint); |
| |
| paint.setColor(SK_ColorLTGRAY); |
| canvas->drawRect(fClip, paint); |
| |
| paint.setAntiAlias(true); |
| paint.setColor(SK_ColorBLUE); |
| paint.setStyle(SkPaint::kStroke_Style); |
| // paint.setStrokeWidth(SkIntToScalar(3)); |
| paint.setStrokeCap(SkPaint::kRound_Cap); |
| |
| paint1.setAntiAlias(true); |
| paint1.setColor(SK_ColorRED); |
| paint1.setStyle(SkPaint::kStroke_Style); |
| gProcs[fProcIndex](fPts, fClip, canvas, paint, paint1); |
| this->inval(NULL); |
| } |
| |
| virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) { |
| // fProcIndex = (fProcIndex + 1) % SK_ARRAY_COUNT(gProcs); |
| if (x < 50 && y < 50) { |
| this->randPts(); |
| } |
| this->inval(NULL); |
| return NULL; |
| } |
| |
| virtual bool onClick(Click* click) { |
| return false; |
| } |
| |
| private: |
| typedef SampleView INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| static SkView* MyFactory() { return new LineClipperView; } |
| static SkViewRegister reg(MyFactory); |
| |