C++ SkRect::centerX方法代码示例

void anchor_handle_renderer::draw_anchor (SkCanvas &canvas, const SkRect &rect, SkPaint &paint) const
{
  switch (m_node_type)
  {
    case handle_type::DIAMOND:
    {
      canvas.save ();
      canvas.translate (rect.centerX (), rect.centerY ());
      canvas.rotate (45);
      SkRect moved_rect = rect;
      moved_rect.offset (-rect.centerX (), -rect.centerY ());
      paint.setAntiAlias (true);
      canvas.drawRect (moved_rect, paint);
      canvas.restore ();
      break;
    }
    case handle_type::SQUARE:
      canvas.drawRect (rect, paint);
      break;
    case handle_type::CIRCLE:
      canvas.drawOval (rect, paint);
      break;
    case handle_type::DOUBLE_HEADED_ARROW:
    case handle_type::ROTATE_ARROW:
      SkPath path = qt2skia::path (*m_paths.at (m_node_type));
      SkMatrix trans;
      trans.setIdentity ();
      trans.postRotate (m_rotation_angle, 32, 32); // TODO: change all these to use info from path_storage (bounding box and center (possibly should be made 0))
      trans.postConcat (qt2skia::matrix (geom::rect2rect (QRectF (0, 0, 64, 64), qt2skia::rect (rect))));
      path.transform (trans);
      paint.setAntiAlias (true);
      canvas.drawPath (path, paint);
      break;
  }
}

 static void drawRectWithLines(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
     canvas->drawRect(r, p);
     canvas->drawLine(r.fLeft, r.fTop, r.fRight, r.fBottom, p);
     canvas->drawLine(r.fLeft, r.fBottom, r.fRight, r.fTop, p);
     canvas->drawLine(r.fLeft, r.centerY(), r.fRight, r.centerY(), p);
     canvas->drawLine(r.centerX(), r.fTop, r.centerX(), r.fBottom, p);
 }

bool intersects(SkRect tRect, float tRot, TextDrawInfo* s)
{
	float sRot = s->pathRotate;
	if (absFloat(tRot) < M_PI / 15 && absFloat(sRot) < M_PI / 15) {
		return SkRect::Intersects(tRect, s->bounds);
	}
	float dist = sqrt(sqr(tRect.centerX() - s->bounds.centerX()) + sqr(tRect.centerY() - s->bounds.centerY()));
	if(dist < 3) {
		return true;
	}
	SkRect sRect = s->bounds;

	// difference close to 90/270 degrees
	if(absFloat(cos(tRot-sRot)) < 0.3 ){
		// rotate one rectangle to 90 degrees
		tRot += M_PI_2;
		tRect = SkRect::MakeXYWH(tRect.centerX() -  tRect.height() / 2, tRect.centerY() -  tRect.width() / 2,
				tRect.height(), tRect.width());
	}

	// determine difference close to 180/0 degrees
	if(absFloat(sin(tRot-sRot)) < 0.3){
		// rotate t box
		// (calculate offset for t center suppose we rotate around s center)
		float diff = atan2(tRect.centerY() - sRect.centerY(), tRect.centerX() - sRect.centerX());
		diff -= sRot;
		float left = sRect.centerX() + dist* cos(diff) - tRect.width()/2;
		float top = sRect.centerY() - dist* sin(diff) - tRect.height()/2;
		SkRect nRect = SkRect::MakeXYWH(left, top, tRect.width(), tRect.height());
		return SkRect::Intersects(nRect, sRect);
	}

	// TODO other cases not covered
	return SkRect::Intersects(tRect, sRect);
}

    void onDraw(SkCanvas* canvas) override {
        SkAutoCanvasRestore acr(canvas, false);

        SkPaint paint;
        paint.setAntiAlias(true);

        if (fInterp) {
            SkScalar values[5];
            SkInterpolator::Result res = fInterp->timeToValues(fTime, values);
            fColor = floats_to_color(values);

            canvas->save();
            canvas->translate(fR.centerX(), fR.centerY());
            canvas->rotate(values[4]);
            canvas->translate(-fR.centerX(), -fR.centerY());

            switch (res) {
                case SkInterpolator::kFreezeEnd_Result:
                    delete fInterp;
                    fInterp = nullptr;
                    break;
                default:
                    break;
            }
        }
        paint.setColor(fColor);
        canvas->drawRect(fR, paint);
    }

    void drawBorders(SkCanvas* canvas) {
        SkPaint p;
        p.setStyle(SkPaint::kStroke_Style);
        p.setColor(SK_ColorBLUE);

        SkRect r = SkRect::MakeWH(fCell.width() * 2, fCell.height() * 2);
        r.inset(SK_ScalarHalf, SK_ScalarHalf);
        canvas->drawRect(r, p);
        canvas->drawLine(r.left(), r.centerY(), r.right(), r.centerY(), p);
        canvas->drawLine(r.centerX(), r.top(), r.centerX(), r.bottom(), p);
    }

void draw(SkCanvas* canvas) {
    SkPaint paint;
    paint.setColor(SK_ColorGRAY);
    paint.setAntiAlias(true);
    SkRect rect = {20, 20, 100, 100};
    canvas->drawRect(rect, paint);
    paint.setColor(SK_ColorRED);
    SkMatrix matrix;
    matrix.setRSXform(SkRSXform::Make(.85f, .25f, rect.centerX(), rect.centerY()));
    canvas->concat(matrix);
    canvas->translate(-rect.centerX(), -rect.centerY());
    canvas->drawRect(rect, paint);
}

static void draw_path(SkCanvas* canvas, const SkRect& r, sk_sp<SkImageFilter> imf) {
    SkPaint paint;
    paint.setColor(SK_ColorMAGENTA);
    paint.setImageFilter(std::move(imf));
    paint.setAntiAlias(true);
    canvas->drawCircle(r.centerX(), r.centerY(), r.width()*2/5, paint);
}

    void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
                  SkScalar scale, const SkPaint& paint) {

        const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };

        canvas->save();
        canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
        canvas->clipRect(r);
        canvas->drawColor(SK_ColorWHITE);
        fPath.setFillType(ft);
        canvas->translate(r.centerX(), r.centerY());
        canvas->scale(scale, scale);
        canvas->translate(-r.centerX(), -r.centerY());
        canvas->drawPath(fPath, paint);
        canvas->restore();
    }

void SkSVGDevice::drawOval(const SkDraw& draw, const SkRect& oval, const SkPaint& paint) {
    AutoElement ellipse("ellipse", fWriter, fResourceBucket, draw, paint);
    ellipse.addAttribute("cx", oval.centerX());
    ellipse.addAttribute("cy", oval.centerY());
    ellipse.addAttribute("rx", oval.width() / 2);
    ellipse.addAttribute("ry", oval.height() / 2);
}

PathTexture* PathCache::getArc(float width, float height,
        float startAngle, float sweepAngle, bool useCenter, const SkPaint* paint) {
    PathDescription entry(kShapeArc, paint);
    entry.shape.arc.mWidth = width;
    entry.shape.arc.mHeight = height;
    entry.shape.arc.mStartAngle = startAngle;
    entry.shape.arc.mSweepAngle = sweepAngle;
    entry.shape.arc.mUseCenter = useCenter;

    PathTexture* texture = get(entry);

    if (!texture) {
        SkPath path;
        SkRect r;
        r.set(0.0f, 0.0f, width, height);
        if (useCenter) {
            path.moveTo(r.centerX(), r.centerY());
        }
        path.arcTo(r, startAngle, sweepAngle, !useCenter);
        if (useCenter) {
            path.close();
        }

        texture = addTexture(entry, &path, paint);
    }

    return texture;
}

static void draw_sweep(SkCanvas* c, int width, int height, SkScalar angle) {
    SkRect  r;
    SkPaint p;
    
    p.setAntiAlias(true);
//    p.setDither(true);
    p.setStrokeWidth(SkIntToScalar(width/10));
    p.setStyle(SkPaint::kStroke_Style);

    r.set(0, 0, SkIntToScalar(width), SkIntToScalar(height));
    
    //    SkColor colors[] = { SK_ColorRED, SK_ColorBLUE, SK_ColorGREEN, SK_ColorCYAN };
    SkColor colors[] = { 0x4c737373, 0x4c737373, 0xffffd300 };
    SkShader* s = SkGradientShader::CreateSweep(r.centerX(), r.centerY(),
                                                colors, NULL, SK_ARRAY_COUNT(colors));
    p.setShader(s)->unref();
    
    SkAutoCanvasRestore acr(c, true);

    c->translate(r.centerX(), r.centerY());
    c->rotate(angle);
    c->translate(-r.centerX(), -r.centerY());

    SkRect bounds = r;
    r.inset(p.getStrokeWidth(), p.getStrokeWidth());
    SkRect innerBounds = r;

    if (true) {
        c->drawOval(r, p);
    } else {
        SkScalar x = r.centerX();
        SkScalar y = r.centerY();
        SkScalar radius = r.width() / 2;
        SkScalar thickness = p.getStrokeWidth();
        SkScalar sweep = SkFloatToScalar(360.0f);
        SkPath path;
        
        path.moveTo(x + radius, y);
        // outer top
        path.lineTo(x + radius + thickness, y);
        // outer arc
        path.arcTo(bounds, 0, sweep, false);
        // inner arc
        path.arcTo(innerBounds, sweep, -sweep, false);
        path.close();
    }
}

static void draw_text(SkCanvas* canvas, const SkRect& r, sk_sp<SkImageFilter> imf) {
    SkPaint paint;
    paint.setImageFilter(std::move(imf));
    paint.setColor(SK_ColorGREEN);

    SkFont font(ToolUtils::create_portable_typeface(), r.height() / 2);
    SkTextUtils::DrawString(canvas, "Text", r.centerX(), r.centerY(), font, paint, SkTextUtils::kCenter_Align);
}

    virtual void onDraw(SkCanvas* canvas) {

        canvas->drawColor(SK_ColorGRAY);

        SkPaint paint;
        paint.setTypeface(fTypeface);

        const char* text = "hamburgerfons";

        // draw text at different point sizes
        const int textSize[] = { 10, 30, 50 };
        const int textYOffset[] = { 10, 40, 100};
        SkASSERT(sizeof(textSize) == sizeof(textYOffset));
        for (size_t y = 0; y < sizeof(textSize) / sizeof(int); ++y) {
            paint.setTextSize(SkIntToScalar(textSize[y]));
            canvas->drawText(text, strlen(text), 10, SkIntToScalar(textYOffset[y]), paint);
        }

        // setup work needed to draw text with different clips
        canvas->translate(10, 160);
        paint.setTextSize(40);

        // compute the bounds of the text
        SkRect bounds;
        paint.measureText(text, strlen(text), &bounds);

        const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
        const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
        const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
        const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;

        SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
                                                boundsHalfWidth, boundsHalfHeight);
        SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
                                                 boundsHalfWidth, boundsHalfHeight);
        SkRect interiorClip = bounds;
        interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);

        const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip };

        SkPaint clipHairline;
        clipHairline.setColor(SK_ColorWHITE);
        clipHairline.setStyle(SkPaint::kStroke_Style);

        for (size_t x = 0; x < sizeof(clipRects) / sizeof(SkRect); ++x) {
            canvas->save();
            canvas->drawRect(clipRects[x], clipHairline);
            paint.setAlpha(0x20);
            canvas->drawText(text, strlen(text), 0, 0, paint);
            canvas->clipRect(clipRects[x]);
            paint.setAlpha(0xFF);
            canvas->drawText(text, strlen(text), 0, 0, paint);
            canvas->restore();
            canvas->translate(0, bounds.height() + SkIntToScalar(25));
        }
    }

static void draw_path(SkCanvas* canvas, const SkRect& r, SkImageFilter* imf) {
    SkPaint paint;
    paint.setColor(SK_ColorMAGENTA);
    paint.setImageFilter(imf);
    paint.setAntiAlias(true);
    canvas->save();
    canvas->clipRect(r);
    canvas->drawCircle(r.centerX(), r.centerY(), r.width()*2/5, paint);
    canvas->restore();
}

static void draw_text(SkCanvas* canvas, const SkRect& r, sk_sp<SkImageFilter> imf) {
    SkPaint paint;
    paint.setImageFilter(std::move(imf));
    paint.setColor(SK_ColorGREEN);
    paint.setAntiAlias(true);
    sk_tool_utils::set_portable_typeface(&paint);
    paint.setTextSize(r.height()/2);
    paint.setTextAlign(SkPaint::kCenter_Align);
    canvas->drawText("Text", 4, r.centerX(), r.centerY(), paint);
}