當前位置: 首頁>>代碼示例>>C++>>正文

C++ CGContextSaveGState函數代碼示例

本文整理匯總了C++中CGContextSaveGState函數的典型用法代碼示例。如果您正苦於以下問題：C++ CGContextSaveGState函數的具體用法？C++ CGContextSaveGState怎麽用？C++ CGContextSaveGState使用的例子？那麽, 這裏精選的函數代碼示例或許可以為您提供幫助。


在下文中一共展示了CGContextSaveGState函數的15個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C++代碼示例。

示例1: doStrokeWithCTM

void doStrokeWithCTM(CGContextRef context)
{
	CGContextTranslateCTM(context, 150., 180.);
	CGContextSetLineWidth(context, 10);
	// Draw ellipse 1 with a uniform stroke.
	CGContextSaveGState(context);
		// Scale the CTM so the circular arc will be elliptical.
		CGContextScaleCTM(context, 2, 1);
		CGContextBeginPath(context);
		// Create an arc that is a circle.
		CGContextAddArc(context, 0., 0., 45., 0., 2*M_PI, 0);
	// Restore the context parameters prior to stroking the path.
	// CGContextRestoreGState does not affect the path in the context.
	CGContextRestoreGState(context);
	CGContextStrokePath(context);
	
	// *** was 0, -120
	CGContextTranslateCTM(context, 220., 0.);
	// Draw ellipse 2 with non-uniform stroke.
	CGContextSaveGState(context);
		// Scale the CTM so the circular arc will be elliptical.
		CGContextScaleCTM(context, 2, 1);
		CGContextBeginPath(context);
		// Create an arc that is a circle.
		CGContextAddArc(context, 0., 0., 45., 0., 2*M_PI, 0);
		// Stroke the path with the scaled coordinate system in effect.
		CGContextStrokePath(context);
	CGContextRestoreGState(context);
}
開發者ID:yarshure，項目名稱:ProgrammingWithQuartz-Code，代碼行數:29，代碼來源:PathDrawing.c

示例2: CGContextSaveGState

void WKCACFLayer::display(PlatformGraphicsContext* context)
{
    if (!m_owner)
        return;

    CGContextSaveGState(context);

    CGRect layerBounds = bounds();
    if (m_owner->contentsOrientation() == WebCore::GraphicsLayer::CompositingCoordinatesTopDown) {
        CGContextScaleCTM(context, 1, -1);
        CGContextTranslateCTM(context, 0, -layerBounds.size.height);
    }

    if (m_owner->client()) {
        GraphicsContext graphicsContext(context);

        // It's important to get the clip from the context, because it may be significantly
        // smaller than the layer bounds (e.g. tiled layers)
        CGRect clipBounds = CGContextGetClipBoundingBox(context);
        IntRect clip(enclosingIntRect(clipBounds));
        m_owner->paintGraphicsLayerContents(graphicsContext, clip);
    }
#ifndef NDEBUG
    else {
        ASSERT_NOT_REACHED();

        // FIXME: ideally we'd avoid calling -setNeedsDisplay on a layer that is a plain color,
        // so CA never makes backing store for it (which is what -setNeedsDisplay will do above).
        CGContextSetRGBFillColor(context, 0.0f, 1.0f, 0.0f, 1.0f);
        CGContextFillRect(context, layerBounds);
    }
#endif

    if (m_owner->showRepaintCounter()) {
        char text[16]; // that's a lot of repaints
        _snprintf(text, sizeof(text), "%d", m_owner->incrementRepaintCount());

        CGContextSaveGState(context);
        CGContextSetRGBFillColor(context, 1.0f, 0.0f, 0.0f, 0.8f);
        
        CGRect aBounds = layerBounds;

        aBounds.size.width = 10 + 12 * strlen(text);
        aBounds.size.height = 25;
        CGContextFillRect(context, aBounds);
        
        CGContextSetRGBFillColor(context, 0.0f, 0.0f, 0.0f, 1.0f);

        CGContextSetTextMatrix(context, CGAffineTransformMakeScale(1.0f, -1.0f));
        CGContextSelectFont(context, "Helvetica", 25, kCGEncodingMacRoman);
        CGContextShowTextAtPoint(context, aBounds.origin.x + 3.0f, aBounds.origin.y + 20.0f, text, strlen(text));
        
        CGContextRestoreGState(context);        
    }

    CGContextRestoreGState(context);
}
開發者ID:325116067，項目名稱:semc-qsd8x50，代碼行數:57，代碼來源:WKCACFLayer.cpp

示例3: CGContextSaveGState

//-----------------------------------------------------------------------------
void CGDrawContext::init ()
{
	CGContextSaveGState (cgContext);
	CGContextSetShouldAntialias (cgContext, false);
	CGContextSetFillColorSpace (cgContext, GetCGColorSpace ());
	CGContextSetStrokeColorSpace (cgContext, GetCGColorSpace ()); 
	CGContextSaveGState (cgContext);
	CGAffineTransform cgCTM = CGAffineTransformMake (1.0, 0.0, 0.0, -1.0, 0.0, 0.0);
	CGContextSetTextMatrix (cgContext, cgCTM);

	CDrawContext::init ();
}
開發者ID:DaniM，項目名稱:lyngo，代碼行數:13，代碼來源:cgdrawcontext.cpp

示例4: wxRect

wxBitmap wxScreenDCImpl::DoGetAsBitmap(const wxRect *subrect) const
{
    wxRect rect = subrect ? *subrect : wxRect(0, 0, m_width, m_height);

    wxBitmap bmp(rect.GetSize(), 32);

#if !wxOSX_USE_IPHONE
    CGRect srcRect = CGRectMake(rect.x, rect.y, rect.width, rect.height);

    CGContextRef context = (CGContextRef)bmp.GetHBITMAP();

    CGContextSaveGState(context);

    CGContextTranslateCTM( context, 0,  m_height );
    CGContextScaleCTM( context, 1, -1 );

    if ( subrect )
        srcRect = CGRectOffset( srcRect, -subrect->x, -subrect->y ) ;

    CGImageRef image = grabViaOpenGL(kCGNullDirectDisplay, srcRect);

    wxASSERT_MSG(image, wxT("wxScreenDC::GetAsBitmap - unable to get screenshot."));

    CGContextDrawImage(context, srcRect, image);
    
    CGImageRelease(image);

    CGContextRestoreGState(context);
#else
    // TODO implement using UIGetScreenImage, CGImageCreateWithImageInRect, CGContextDrawImage
#endif
    return bmp;
}
開發者ID:erwincoumans，項目名稱:wxWidgets，代碼行數:33，代碼來源:dcscreen.cpp

示例5: paintRepaintRectOverlay

static void paintRepaintRectOverlay(CGContextRef context, WKImageRef image, WKArrayRef repaintRects)
{
    WKSize imageSize = WKImageGetSize(image);

    CGContextSaveGState(context);

    // Using a transparency layer is easier than futzing with clipping.
    CGContextBeginTransparencyLayer(context, 0);
    
    // Flip the context.
    CGContextScaleCTM(context, 1, -1);
    CGContextTranslateCTM(context, 0, -imageSize.height);
    
    CGContextSetRGBFillColor(context, 0, 0, 0, static_cast<CGFloat>(0.66));
    CGContextFillRect(context, CGRectMake(0, 0, imageSize.width, imageSize.height));

    // Clear the repaint rects.
    size_t count = WKArrayGetSize(repaintRects);
    for (size_t i = 0; i < count; ++i) {
        WKRect rect = WKRectGetValue(static_cast<WKRectRef>(WKArrayGetItemAtIndex(repaintRects, i)));
        CGRect cgRect = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
        CGContextClearRect(context, cgRect);
    }
    
    CGContextEndTransparencyLayer(context);
    CGContextRestoreGState(context);
}
開發者ID:ZeusbaseWeb，項目名稱:webkit，代碼行數:27，代碼來源:TestInvocationCG.cpp

示例6: MCTileCacheCoreGraphicsCompositor_BeginLayer

bool MCTileCacheCoreGraphicsCompositor_BeginLayer(void *p_context, const MCRectangle& p_clip, uint32_t p_opacity, uint32_t p_ink)
{
	MCTileCacheCoreGraphicsCompositorContext *self;
	self = (MCTileCacheCoreGraphicsCompositorContext *)p_context;
	
	CGContextSaveGState(self -> cgcontext);
	
	// MW-2012-09-18: [[ Bug 10202 ]] If the ink is no-op then ensure nothing happens.
	if (p_ink == GXnoop)
		CGContextClipToRect(self -> cgcontext, CGRectZero);
	else
	{
		CGContextClipToRect(self -> cgcontext, CGRectMake(p_clip . x, self -> viewport_height - (p_clip . y + p_clip . height), p_clip . width, p_clip . height));
		CGContextSetAlpha(self -> cgcontext, p_opacity / 255.0);
		
		CGBlendMode t_blend_mode;
		switch(p_ink)
		{
			case GXblendMultiply:
				t_blend_mode = kCGBlendModeMultiply;
				break;
			case GXblendScreen: 
				t_blend_mode = kCGBlendModeScreen;
				break;
			case GXblendOverlay: 
				t_blend_mode = kCGBlendModeOverlay;
				break;
			case GXblendDarken: 
				t_blend_mode = kCGBlendModeDarken;
				break;
			case GXblendLighten: 
				t_blend_mode = kCGBlendModeLighten;
				break;
			case GXblendDodge: 
				t_blend_mode = kCGBlendModeColorDodge;
				break;
			case GXblendBurn: 
				t_blend_mode = kCGBlendModeColorBurn;
				break;
			case GXblendSoftLight: 
				t_blend_mode = kCGBlendModeSoftLight;
				break;
			case GXblendHardLight: 
				t_blend_mode = kCGBlendModeHardLight;
				break;
			case GXblendDifference: 
				t_blend_mode = kCGBlendModeDifference;
				break;
			case GXblendExclusion: 
				t_blend_mode = kCGBlendModeExclusion;
				break;
			default:
				t_blend_mode = kCGBlendModeNormal;
				break;
		}
		CGContextSetBlendMode(self -> cgcontext, t_blend_mode);
	}
	
	return true;
}
開發者ID:alilloyd，項目名稱:livecode，代碼行數:60，代碼來源:tilecachecg.cpp

示例7: platformContext

void GraphicsContext::fillRect(const FloatRect& rect)
{
    if (paintingDisabled())
        return;

    CGContextRef context = platformContext();

    if (m_state.fillGradient) {
        CGContextSaveGState(context);
        CGContextConcatCTM(context, m_state.fillGradient->gradientSpaceTransform());
        if (hasShadow()) {
            CGLayerRef layer = CGLayerCreateWithContext(context, CGSizeMake(rect.width(), rect.height()), 0);
            CGContextRef layerContext = CGLayerGetContext(layer);
            m_state.fillGradient->paint(layerContext);
            CGContextDrawLayerAtPoint(context, CGPointMake(rect.left(), rect.top()), layer);
            CGLayerRelease(layer);
        } else {
            CGContextClipToRect(context, rect);
            m_state.fillGradient->paint(this);
        }
        CGContextRestoreGState(context);
        return;
    }

    if (m_state.fillPattern)
        applyFillPattern();
    CGContextFillRect(context, rect);
}
開發者ID:dslab-epfl，項目名稱:warr，代碼行數:28，代碼來源:GraphicsContextCG.cpp

示例8: CGContextSaveGState

void GraphicsContext::savePlatformState()
{
    // Note: Do not use this function within this class implementation, since we want to avoid the extra
    // save of the secondary context (in GraphicsContextPlatformPrivateCG.h).
    CGContextSaveGState(platformContext());
    m_data->save();
}
開發者ID:dslab-epfl，項目名稱:warr，代碼行數:7，代碼來源:GraphicsContextCG.cpp

示例9: snprintf

void PlatformCALayer::drawRepaintIndicator(CGContextRef context, PlatformCALayer* platformCALayer, int repaintCount, CGColorRef customBackgroundColor)
{
    char text[16]; // that's a lot of repaints
    snprintf(text, sizeof(text), "%d", repaintCount);

    CGRect indicatorBox = platformCALayer->bounds();
    indicatorBox.size.width = 12 + 10 * strlen(text);
    indicatorBox.size.height = 27;
    CGContextSaveGState(context);

    CGContextSetAlpha(context, 0.5f);
    CGContextBeginTransparencyLayerWithRect(context, indicatorBox, 0);

    if (customBackgroundColor)
        CGContextSetFillColorWithColor(context, customBackgroundColor);
    else
        CGContextSetRGBFillColor(context, 0, 0.5f, 0.25f, 1);

    CGContextFillRect(context, indicatorBox);

    if (platformCALayer->acceleratesDrawing())
        CGContextSetRGBFillColor(context, 1, 0, 0, 1);
    else
        CGContextSetRGBFillColor(context, 1, 1, 1, 1);

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    CGContextSetTextMatrix(context, CGAffineTransformMakeScale(1, -1));
    CGContextSelectFont(context, "Helvetica", 22, kCGEncodingMacRoman);
    CGContextShowTextAtPoint(context, indicatorBox.origin.x + 5, indicatorBox.origin.y + 22, text, strlen(text));
#pragma clang diagnostic pop

    CGContextEndTransparencyLayer(context);
    CGContextRestoreGState(context);
}
開發者ID:highweb-project，項目名稱:highweb-parallelwebkit，代碼行數:35，代碼來源:PlatformCALayer.cpp

示例10: beginCGContext

//-----------------------------------------------------------------------------
void CGDrawContext::fillLinearGradient (CGraphicsPath* _path, const CGradient& gradient, const CPoint& startPoint, const CPoint& endPoint, bool evenOdd, CGraphicsTransform* t)
{
	QuartzGraphicsPath* path = dynamic_cast<QuartzGraphicsPath*> (_path);
	if (path == 0)
		return;

	const QuartzGradient* cgGradient = dynamic_cast<const QuartzGradient*> (&gradient);
	if (cgGradient == 0)
		return;

	CGContextRef cgContext = beginCGContext (true, currentState.drawMode.integralMode ());
	if (cgContext)
	{
		if (t)
		{
			CGContextSaveGState (cgContext);
			CGAffineTransform transform = QuartzGraphicsPath::createCGAfflineTransform (*t);
			CGContextConcatCTM (cgContext, transform);
			CGContextAddPath (cgContext, path->getCGPathRef ());
			CGContextRestoreGState (cgContext);
		}
		else
			CGContextAddPath (cgContext, path->getCGPathRef ());

		if (evenOdd)
			CGContextEOClip (cgContext);
		else
			CGContextClip (cgContext);

		CGContextDrawLinearGradient (cgContext, *cgGradient, CGPointMake (startPoint.x, startPoint.y), CGPointMake (endPoint.x, endPoint.y), kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
		
		releaseCGContext (cgContext);
	}
}
開發者ID:DaniM，項目名稱:lyngo，代碼行數:35，代碼來源:cgdrawcontext.cpp

示例11: CGRectMake

wxBitmap wxScreenDCImpl::DoGetAsBitmap(const wxRect *subrect) const
{
    CGRect srcRect = CGRectMake(0, 0, m_width, m_height);
    if (subrect)
    {
        srcRect.origin.x = subrect->GetX();
        srcRect.origin.y = subrect->GetY();
        srcRect.size.width = subrect->GetWidth();
        srcRect.size.height = subrect->GetHeight();
    }
    wxBitmap bmp = wxBitmap(srcRect.size.width, srcRect.size.height, 32);
#if wxOSX_USE_IPHONE
#else
    CGContextRef context = (CGContextRef)bmp.GetHBITMAP();
    
    CGContextSaveGState(context);
    
    CGContextTranslateCTM( context, 0,  m_height );
    CGContextScaleCTM( context, 1, -1 );
    
    if ( subrect )
        srcRect = CGRectOffset( srcRect, -subrect->x, -subrect->y ) ;
    
    CGImageRef image = grabViaOpenGL(kCGNullDirectDisplay, srcRect);
    
    wxASSERT_MSG(image, wxT("wxScreenDC::GetAsBitmap - unable to get screenshot."));
    
    CGContextDrawImage(context, srcRect, image);
    
    CGContextRestoreGState(context);
#endif
    return bmp;
}
開發者ID:jonntd，項目名稱:dynamica，代碼行數:33，代碼來源:dcscreen.cpp

示例12: AddRoundedRectToPath

static void AddRoundedRectToPath(CGContextRef context, CGRect rect,
                                 float ovalWidth, float ovalHeight)
{
    float fw, fh;

    if (ovalWidth == 0 || ovalHeight == 0)
    {
        CGContextAddRect(context, rect);
        return;
    }

    CGContextSaveGState(context);

    CGContextTranslateCTM (context, CGRectGetMinX(rect),
                           CGRectGetMinY(rect));
    CGContextScaleCTM (context, ovalWidth, ovalHeight);
    fw = CGRectGetWidth (rect) / ovalWidth;
    fh = CGRectGetHeight (rect) / ovalHeight;

    CGContextMoveToPoint(context, fw, fh / 2);
    CGContextAddArcToPoint(context, fw, fh, fw / 2, fh, 1);
    CGContextAddArcToPoint(context, 0, fh, 0, fh / 2, 1);
    CGContextAddArcToPoint(context, 0, 0, fw / 2, 0, 1);
    CGContextAddArcToPoint(context, fw, 0, fw, fh / 2, 1);
    CGContextClosePath(context);

    CGContextRestoreGState(context);
}
開發者ID:AdamDiment，項目名稱:CocoaSampleCode，代碼行數:28，代碼來源:hud.cpp

示例13: ScratchContext

Rect
PathCG::GetStrokedBounds(const StrokeOptions &aStrokeOptions,
                         const Matrix &aTransform) const
{
  // 10.7 has CGPathCreateCopyByStrokingPath which we could use
  // instead of this scratch context business
  CGContextRef cg = ScratchContext();

  CGContextSaveGState(cg);

  CGContextBeginPath(cg);
  CGContextAddPath(cg, mPath);

  SetStrokeOptions(cg, aStrokeOptions);

  CGContextReplacePathWithStrokedPath(cg);
  Rect bounds = CGRectToRect(CGContextGetPathBoundingBox(cg));

  CGContextRestoreGState(cg);

  if (!bounds.IsFinite()) {
    return Rect();
  }

  return aTransform.TransformBounds(bounds);
}
開發者ID:70599，項目名稱:Waterfox，代碼行數:26，代碼來源:PathCG.cpp

示例14: snprintf

void PlatformCALayer::drawRepaintIndicator(CGContextRef context, PlatformCALayer* platformCALayer, int repaintCount, CGColorRef customBackgroundColor)
{
    char text[16]; // that's a lot of repaints
    snprintf(text, sizeof(text), "%d", repaintCount);
    
    CGRect indicatorBox = platformCALayer->bounds();

    CGContextSaveGState(context);

    indicatorBox.size.width = 12 + 10 * strlen(text);
    indicatorBox.size.height = 27;
    
    CGContextSetAlpha(context, 0.5f);
    CGContextBeginTransparencyLayerWithRect(context, indicatorBox, 0);
    
    if (customBackgroundColor)
        CGContextSetFillColorWithColor(context, customBackgroundColor);
    else
        CGContextSetRGBFillColor(context, 0, 0.5f, 0.25f, 1);
    
    CGContextFillRect(context, indicatorBox);
    
    if (platformCALayer->acceleratesDrawing())
        CGContextSetRGBFillColor(context, 1, 0, 0, 1);
    else
        CGContextSetRGBFillColor(context, 1, 1, 1, 1);
    
    platformCALayer->drawTextAtPoint(context, indicatorBox.origin.x + 5, indicatorBox.origin.y + 22, CGSizeMake(1, -1), 22, text, strlen(text));
    
    CGContextEndTransparencyLayer(context);
    CGContextRestoreGState(context);
}
開發者ID:rhythmkay，項目名稱:webkit，代碼行數:32，代碼來源:PlatformCALayer.cpp

示例15: platformContext

void GraphicsContext::drawConvexPolygon(size_t npoints, const FloatPoint* points, bool shouldAntialias)
{
    if (paintingDisabled())
        return;

    if (npoints <= 1)
        return;

    CGContextRef context = platformContext();

    CGContextSaveGState(context);

    CGContextSetShouldAntialias(context, shouldAntialias);
    
    CGContextBeginPath(context);
    CGContextMoveToPoint(context, points[0].x(), points[0].y());
    for (size_t i = 1; i < npoints; i++)
        CGContextAddLineToPoint(context, points[i].x(), points[i].y());
    CGContextClosePath(context);

    if (fillColor().alpha())
        CGContextEOFillPath(context);

    if (strokeStyle() != NoStroke)
        CGContextStrokePath(context);

    CGContextRestoreGState(context);
}
開發者ID:jackiekaon，項目名稱:owb-mirror，代碼行數:28，代碼來源:GraphicsContextCG.cpp


注：本文中的CGContextSaveGState函數示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台，相關代碼片段篩選自各路編程大神貢獻的開源項目，源碼版權歸原作者所有，傳播和使用請參考對應項目的License；未經允許，請勿轉載。