C++ SkPath::cubicTo方法代码示例

    void onDrawContent(SkCanvas* canvas) override {
        test_huge_stroke(canvas); return;
        canvas->translate(SkIntToScalar(10), SkIntToScalar(10));

        SkPaint paint;
        paint.setAntiAlias(true);

        if (true) {
            canvas->drawColor(SK_ColorBLACK);

            paint.setTextSize(24);
            paint.setColor(SK_ColorWHITE);
            canvas->translate(10, 30);

            static const SkBlurStyle gStyle[] = {
                kNormal_SkBlurStyle,
                kInner_SkBlurStyle,
                kOuter_SkBlurStyle,
                kSolid_SkBlurStyle,
            };
            for (int x = 0; x < 5; x++) {
                SkScalar sigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(4));
                for (int y = 0; y < 10; y++) {
                    if (x) {
                        paint.setMaskFilter(SkBlurMaskFilter::Make(gStyle[x - 1], sigma));
                    }
                    canvas->drawString("Title Bar", x*SkIntToScalar(100), y*SkIntToScalar(30), paint);
                    sigma *= 0.75f;
                }

            }
            return;
        }

        paint.setColor(SK_ColorBLUE);

#if 1
        SkPath p;
        float r = rand.nextUScalar1() + 0.5f;
        SkScalar x = 0, y = 0;
        p.moveTo(x, y);
#if 0
        p.cubicTo(x-75*r, y+75*r, x-40*r, y+125*r, x, y+85*r);
        p.cubicTo(x+40*r, y+125*r, x+75*r, y+75*r, x, y);
#else
        p.cubicTo(x+75*r, y+75*r, x+40*r, y+125*r, x, y+85*r);
        p.cubicTo(x-40*r, y+125*r, x-75*r, y+75*r, x, y);
#endif
        p.close();
        fPath = p;
        fPath.offset(100, 0);
#endif

        fPath.setFillType(SkPath::kWinding_FillType);
        drawSet(canvas, &paint);

        canvas->translate(0, fPath.getBounds().height() * 5 / 4);
        fPath.setFillType(SkPath::kEvenOdd_FillType);
        drawSet(canvas, &paint);
    }

 static void draw_path(SkScalar size, SkCanvas* canvas, SkPaint paint) {
     SkScalar c = 0.551915024494f * size;
     SkPath path;
     path.moveTo(0.0f, size);
     path.cubicTo(c, size, size, c, size, 0.0f);
     path.cubicTo(size, -c, c, -size, 0.0f, -size);
     path.cubicTo(-c, -size, -size, -c, -size, 0.0f);
     path.cubicTo(-size, c, -c, size, 0.0f, size);
     canvas->drawPath(path, paint);
 }

/* Generated on a Mac with:
 * paint.setTypeface(SkTypeface::CreateByName("Hiragino Maru Gothic Pro"));
 * const unsigned char hyphen[] = { 0xE3, 0x83, 0xBC };
 * paint.getTextPath(hyphen, SK_ARRAY_COUNT(hyphen), 400, 80, &textPath);
 */
static SkPath hiragino_maru_gothic_pro_dash() {
    SkPath path;
    path.moveTo(488, 55.1f);
    path.cubicTo(490.5f, 55.1f, 491.9f, 53.5f, 491.9f, 50.8f);
    path.cubicTo(491.9f, 48.2f, 490.5f, 46.3f, 487.9f, 46.3f);
    path.lineTo(412, 46.3f);
    path.cubicTo(409.4f, 46.3f, 408, 48.2f, 408, 50.8f);
    path.cubicTo(408, 53.5f, 409.4f, 55.1f, 411.9f, 55.1f);
    path.lineTo(488, 55.1f);
    path.close();
    return path;
}

static void PathOpsSimplifyFailTest(skiatest::Reporter* reporter) {
    for (int index = 0; index < (int) (13 * nonFinitePtsCount * finitePtsCount); ++index) {
        SkPath path;
        int i = (int) (index % nonFinitePtsCount);
        int f = (int) (index % finitePtsCount);
        int g = (int) ((f + 1) % finitePtsCount);
        switch (index % 13) {
            case 0: path.lineTo(nonFinitePts[i]); break;
            case 1: path.quadTo(nonFinitePts[i], nonFinitePts[i]); break;
            case 2: path.quadTo(nonFinitePts[i], finitePts[f]); break;
            case 3: path.quadTo(finitePts[f], nonFinitePts[i]); break;
            case 4: path.cubicTo(nonFinitePts[i], finitePts[f], finitePts[f]); break;
            case 5: path.cubicTo(finitePts[f], nonFinitePts[i], finitePts[f]); break;
            case 6: path.cubicTo(finitePts[f], finitePts[f], nonFinitePts[i]); break;
            case 7: path.cubicTo(nonFinitePts[i], nonFinitePts[i], finitePts[f]); break;
            case 8: path.cubicTo(nonFinitePts[i], finitePts[f], nonFinitePts[i]); break;
            case 9: path.cubicTo(finitePts[f], nonFinitePts[i], nonFinitePts[i]); break;
            case 10: path.cubicTo(nonFinitePts[i], nonFinitePts[i], nonFinitePts[i]); break;
            case 11: path.cubicTo(nonFinitePts[i], finitePts[f], finitePts[g]); break;
            case 12: path.moveTo(nonFinitePts[i]); break;
        }
        SkPath result;
        result.setFillType(SkPath::kWinding_FillType);
        bool success = Simplify(path, &result);
        REPORTER_ASSERT(reporter, !success);
        REPORTER_ASSERT(reporter, result.isEmpty());
        REPORTER_ASSERT(reporter, result.getFillType() == SkPath::kWinding_FillType);
        reporter->bumpTestCount();
    }
    if (sizeof(reporter) == 4) {
        return;
    }
    for (int index = 0; index < (int) (11 * finitePtsCount); ++index) {
        SkPath path;
        int f = (int) (index % finitePtsCount);
        int g = (int) ((f + 1) % finitePtsCount);
        switch (index % 11) {
            case 0: path.lineTo(finitePts[f]); break;
            case 1: path.quadTo(finitePts[f], finitePts[f]); break;
            case 2: path.quadTo(finitePts[f], finitePts[g]); break;
            case 3: path.quadTo(finitePts[g], finitePts[f]); break;
            case 4: path.cubicTo(finitePts[f], finitePts[f], finitePts[f]); break;
            case 5: path.cubicTo(finitePts[f], finitePts[f], finitePts[g]); break;
            case 6: path.cubicTo(finitePts[f], finitePts[g], finitePts[f]); break;
            case 7: path.cubicTo(finitePts[f], finitePts[g], finitePts[g]); break;
            case 8: path.cubicTo(finitePts[g], finitePts[f], finitePts[f]); break;
            case 9: path.cubicTo(finitePts[g], finitePts[f], finitePts[g]); break;
            case 10: path.moveTo(finitePts[f]); break;
        }
        SkPath result;
        result.setFillType(SkPath::kWinding_FillType);
        bool success = Simplify(path, &result);
        REPORTER_ASSERT(reporter, success);
        REPORTER_ASSERT(reporter, result.getFillType() != SkPath::kWinding_FillType);
        reporter->bumpTestCount();
    }
}

static SkPath make_path() {
    SkPath path;
    int numOps = R(30);
    for (int i = 0; i < numOps; ++i) {
        switch (R(6)) {
            case 0:
                path.moveTo(make_scalar(), make_scalar());
                break;
            case 1:
                path.lineTo(make_scalar(), make_scalar());
                break;
            case 2:
                path.quadTo(make_scalar(), make_scalar(), make_scalar(), make_scalar());
                break;
            case 3:
                path.conicTo(make_scalar(), make_scalar(), make_scalar(), make_scalar(), make_scalar());
                break;
            case 4:
                path.cubicTo(make_scalar(), make_scalar(), make_scalar(),
                             make_scalar(), make_scalar(), make_scalar());
                break;
            case 5:
            default:
                path.arcTo(make_scalar(), make_scalar(), make_scalar(), make_scalar(), make_scalar());
                break;

        }
    }
    path.close();
    return path;
}

 static SkPoint AddMoveDegenCubicClose(SkPath& path, SkPoint& startPt) {
     SkPoint moveToPt = startPt + SkPoint::Make(0, 10*SK_Scalar1);
     path.moveTo(moveToPt);
     path.cubicTo(moveToPt, moveToPt, moveToPt);
     path.close();
     return moveToPt;
 }

    virtual void onDrawContent(SkCanvas* canvas) {
        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setColor(0xFF8888FF);

        SkRect r = { 0, 0, SK_Scalar1, SK_Scalar1 };
        
        canvas->concat(fMatrix);
        canvas->drawRect(r, paint);

        paint.setColor(SK_ColorBLACK);
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeWidth(0);
        paint.setStrokeCap(SkPaint::kRound_Cap);
        
        SkPath path;
        path.moveTo(fPts[0]);
        path.cubicTo(fPts[1], fPts[2], fPts[3]);
        canvas->drawPath(path, paint);

        paint.setColor(SK_ColorRED);
        paint.setStrokeWidth(0);
        canvas->drawLine(0, 0, SK_Scalar1, SK_Scalar1, paint);

        paint.setColor(SK_ColorBLUE);
        paint.setStrokeWidth(SK_Scalar1 / 60);
        for (int i = 0; i < 50; i++) {
            SkScalar x = i * SK_Scalar1 / 49;
            canvas->drawPoint(x, SkEvalCubicInterval(&fPts[1], x), paint);
        }

        paint.setStrokeWidth(SK_Scalar1 / 20);
        paint.setColor(SK_ColorGREEN);
        canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, &fPts[1], paint);
    }

 static SkPoint AddCubic(SkPath& path, SkPoint& startPt) {
     SkPoint t1Pt = startPt + SkPoint::Make(15*SK_Scalar1, 5*SK_Scalar1);
     SkPoint t2Pt = startPt + SkPoint::Make(25*SK_Scalar1, 5*SK_Scalar1);
     SkPoint endPt = startPt + SkPoint::Make(40*SK_Scalar1, 0);
     path.cubicTo(t1Pt, t2Pt, endPt);
     return endPt;
 }

void draw(SkCanvas* canvas) {
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setStyle(SkPaint::kStroke_Style);
    SkPath path;
    path.moveTo(0, -10);
    for (int i = 0; i < 128; i += 16) {
        SkScalar c = i * 0.5f;
        path.cubicTo( 10 + c, -10 - i,  10 + i, -10 - c,  10 + i,       0);
        path.cubicTo( 14 + i,  14 + c,  14 + c,  14 + i,       0,  14 + i);
        path.cubicTo(-18 - c,  18 + i, -18 - i,  18 + c, -18 - i,       0);
        path.cubicTo(-22 - i, -22 - c, -22 - c, -22 - i,       0, -22 - i);
    }
    path.offset(128, 128);
    canvas->drawPath(path, paint);
}

static void testCubics() {
    SkPath path;
    path.moveTo(2,0);
    path.cubicTo(2,3, 1,1, 0,0);
    path.close();
    test(path);
}

SkPath SubsetVerbs::getSubsetPath() const {
    SkPath result;
    result.setFillType(fPath.getFillType());
    if (!fSelected.count()) {
        return result;
    }
    SkPath::RawIter iter(fPath);
    uint8_t verb;
    SkPoint pts[4];
    int verbIndex = 0;
    bool addMoveTo = true;
    bool addLineTo = false;
    while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
        bool enabled = SkPath::kLine_Verb <= verb && verb <= SkPath::kCubic_Verb
            ? fSelected[verbIndex++] : false;
        if (enabled) {
            if (addMoveTo) {
                result.moveTo(pts[0]);
                addMoveTo = false;
            } else if (addLineTo) {
                result.lineTo(pts[0]);
                addLineTo = false;
            }
        }
        switch (verb) {
            case SkPath::kMove_Verb:
                break;
            case SkPath::kLine_Verb:
                if (enabled) {
                    result.lineTo(pts[1]);
                }
                break;
            case SkPath::kQuad_Verb:
                if (enabled) {
                    result.quadTo(pts[1], pts[2]);
                }
                break;
            case SkPath::kConic_Verb:
                if (enabled) {
                    result.conicTo(pts[1], pts[2], iter.conicWeight());
                }
                break;
            case SkPath::kCubic_Verb:
                 if (enabled) {
                    result.cubicTo(pts[1], pts[2], pts[3]);
                }
                break;
            case SkPath::kClose_Verb:
                result.close();
                addMoveTo = true;
                addLineTo = false;
                continue;
            default:
                SkDEBUGFAIL("bad verb");
                return result;
        }
        addLineTo = !enabled;
    }
    return result;
}

    void onDraw(SkCanvas* canvas) override {
        SkPath path;
        SkRandom rand;

        int scale = 300;
        for (int i = 0; i < 4; ++i) {
            // get the random values deterministically
            SkScalar randoms[12];
            for (int index = 0; index < (int) SK_ARRAY_COUNT(randoms); ++index) {
                randoms[index] = rand.nextUScalar1();
            }
            path.lineTo(randoms[0] * scale, randoms[1] * scale);
            path.quadTo(randoms[2] * scale, randoms[3] * scale,
                        randoms[4] * scale, randoms[5] * scale);
            path.cubicTo(randoms[6] * scale, randoms[7] * scale,
                         randoms[8] * scale, randoms[9] * scale,
                         randoms[10] * scale, randoms[11] * scale);
        }

        path.setFillType(SkPath::kEvenOdd_FillType);
        path.offset(SkIntToScalar(20), SkIntToScalar(20));

        test_hittest(canvas, path);

        canvas->translate(SkIntToScalar(scale), 0);
        path.setFillType(SkPath::kWinding_FillType);

        test_hittest(canvas, path);
    }

static void test_flattening(skiatest::Reporter* reporter) {
    SkPath p;

    static const SkPoint pts[] = {
        { 0, 0 },
        { SkIntToScalar(10), SkIntToScalar(10) },
        { SkIntToScalar(20), SkIntToScalar(10) }, { SkIntToScalar(20), 0 },
        { 0, 0 }, { 0, SkIntToScalar(10) }, { SkIntToScalar(1), SkIntToScalar(10) }
    };
    p.moveTo(pts[0]);
    p.lineTo(pts[1]);
    p.quadTo(pts[2], pts[3]);
    p.cubicTo(pts[4], pts[5], pts[6]);

    SkWriter32 writer(100);
    p.flatten(writer);
    size_t size = writer.size();
    SkAutoMalloc storage(size);
    writer.flatten(storage.get());
    SkReader32 reader(storage.get(), size);

    SkPath p1;
    REPORTER_ASSERT(reporter, p1 != p);
    p1.unflatten(reader);
    REPORTER_ASSERT(reporter, p1 == p);
}

static int cubic_proc(const FT_Vector* pt0, const FT_Vector* pt1,
                      const FT_Vector* pt2, void* ctx) {
    SkPath* path = (SkPath*)ctx;
    path->cubicTo(SkFDot6ToScalar(pt0->x), -SkFDot6ToScalar(pt0->y),
                  SkFDot6ToScalar(pt1->x), -SkFDot6ToScalar(pt1->y),
                  SkFDot6ToScalar(pt2->x), -SkFDot6ToScalar(pt2->y));
    return 0;
}

    void onOnceBeforeDraw() override {
        {
            SkPath* bigQuad = &fPaths.push_back();
            bigQuad->moveTo(0, 0);
            bigQuad->quadTo(kWidth/2, kHeight, kWidth, 0);
        }

        {
            SkPath* degenBigQuad = &fPaths.push_back();
            SkScalar yPos = kHeight / 2 + 10;
            degenBigQuad->moveTo(0, yPos);
            degenBigQuad->quadTo(0, yPos, kWidth, yPos);
        }


        {
            SkPath* bigCubic = &fPaths.push_back();
            bigCubic->moveTo(0, 0);
            bigCubic->cubicTo(0, kHeight,
                              kWidth, kHeight,
                              kWidth, 0);
        }

        {
            SkPath* degenBigCubic = &fPaths.push_back();
            SkScalar yPos = kHeight / 2;
            degenBigCubic->moveTo(0, yPos);
            degenBigCubic->cubicTo(0, yPos,
                                   0, yPos,
                                   kWidth, yPos);
        }

        {
            SkPath* bigConic = &fPaths.push_back();
            bigConic->moveTo(0, 0);
            bigConic->conicTo(kWidth/2, kHeight, kWidth, 0, .5);
        }

        {
            SkPath* degenBigConic = &fPaths.push_back();
            SkScalar yPos = kHeight / 2 - 10;
            degenBigConic->moveTo(0, yPos);
            degenBigConic->conicTo(0, yPos, kWidth, yPos, .5);
        }
    }