void JBGStrokePathByLines(CGContextRef ctx, CGPathRef path, CGColorRef color_1, CGFloat width_1, CGColorRef color_2, CGFloat width_2, CGColorRef color_3, CGFloat width_3)
{
if (width_1 > 0.0f)
{
CGContextSetLineWidth(ctx, width_1);
CGContextAddPath(ctx, path);
CGContextSetStrokeColorWithColor(ctx, color_1);
CGContextStrokePath(ctx);
}
if (width_2 > 0.0f)
{
CGContextAddPath(ctx, path);
CGContextSetStrokeColorWithColor(ctx, color_2);
CGContextSetLineWidth(ctx, width_2);
CGContextStrokePath(ctx);
}
if (width_3 > 0.0f)
{
CGContextAddPath(ctx, path);
CGContextSetStrokeColorWithColor(ctx, color_3);
CGContextSetLineWidth(ctx, width_3);
CGContextStrokePath(ctx);
}
}
void drawWithColorRefs(CGContextRef context)
{
static CGColorRef opaqueRedColor = NULL, opaqueBlueColor = NULL, transparentBlueColor = NULL;
// Initialize the CGColorRefs if necessary
if(opaqueRedColor == NULL){
// Initialize the color array to an opaque red
// in the generic calibrated RGB color space.
float color[4] = { 0.663, 0.0, 0.031, 1.0 };
CGColorSpaceRef theColorSpace = getTheCalibratedRGBColorSpace();
// Create a CGColorRef for opaque red.
opaqueRedColor = CGColorCreate(theColorSpace, color);
// Make the color array correspond to an opaque blue color.
color[0] = 0.482; color[1] = 0.62; color[2] = 0.871;
// Create another CGColorRef for opaque blue.
opaqueBlueColor = CGColorCreate(theColorSpace, color);
// Create a new CGColorRef from the opaqueBlue CGColorRef
// but with a different alpha value.
transparentBlueColor = CGColorCreateCopyWithAlpha(opaqueBlueColor, 0.5);
if(!(opaqueRedColor && opaqueBlueColor && transparentBlueColor)){
fprintf(stderr, "Couldn't create one of the CGColorRefs!!!\n");
return;
}
}
// Set the fill color to the opaque red CGColor object.
CGContextSetFillColorWithColor(context, opaqueRedColor);
// Set the stroke color to the opaque blue CGColor object.
CGContextSetStrokeColorWithColor(context, opaqueBlueColor);
CGContextSetLineWidth(context, 8.);
// Draw the first rectangle.
CGContextBeginPath(context);
CGContextAddRect(context, CGRectMake(20., 20., 100., 100.));
CGContextDrawPath(context, kCGPathFillStroke);
// Set the stroke color to be that of the transparent blue
// CGColor object.
CGContextSetStrokeColorWithColor(context, transparentBlueColor);
// Draw a second rectangle to the right of the first one.
CGContextBeginPath(context);
CGContextAddRect(context, CGRectMake(140., 20., 100., 100.));
CGContextDrawPath(context, kCGPathFillStroke);
}
//-----------------------------------------------------------------------------
void CGDrawContext::setFrameColor (const CColor& color)
{
if (currentState.frameColor == color)
return;
if (cgContext)
CGContextSetStrokeColorWithColor (cgContext, getCGColor (color));
CDrawContext::setFrameColor (color);
}
void JBGFillGradientCircle(CGContextRef ctx, CGPoint center_1, CGFloat r_1, CGPoint center_2, CGFloat r_2, CGGradientRef fill_gradient, CGColorRef stroke_color)
{
if (fill_gradient)
{
CGGradientDrawingOptions options = kCGGradientDrawsBeforeStartLocation;
CGContextDrawRadialGradient(ctx, fill_gradient, center_1, r_1, center_2, r_2, options);
}
if (stroke_color)
{
CGContextSetStrokeColorWithColor(ctx, stroke_color);
CGContextAddArc(ctx, center_2.x, center_2.y, r_2, 0, M_PI * 2, false);
CGContextStrokePath(ctx);
}
}
static void setCGStrokeColor(CGContextRef context, const Color& color, ColorSpace colorSpace)
{
CGContextSetStrokeColorWithColor(context, cachedCGColor(color, colorSpace));
}
void QuartzWindow::set_color(int c) {
CGContextSetFillColorWithColor( myContext, (CGColorRef)c );
CGContextSetStrokeColorWithColor( myContext, (CGColorRef)c );
}
void doClippedEllipse(CGContextRef context)
{
CGPoint theCenterPoint = { 120., 120. };
CGSize theEllipseSize = { 100., 200. };
float dash[1] = { 2 };
static CGColorRef opaqueBrownColor = NULL, opaqueOrangeColor = NULL;
// Initialize the CGColorRefs if necessary.
if(opaqueBrownColor == NULL){
// The initial value of the color array is an
// opaque brown in an RGB color space.
float color[4] = { 0.325, 0.208, 0.157, 1.0 };
CGColorSpaceRef theColorSpace = getTheCalibratedRGBColorSpace();
// Create a CGColorRef for opaque brown.
opaqueBrownColor = CGColorCreate(theColorSpace, color);
// Make the color array correspond to an opaque orange.
color[0] = 0.965 ; color[1] = 0.584; color[2] = 0.059;
// Create another CGColorRef for opaque orange.
opaqueOrangeColor = CGColorCreate(theColorSpace, color);
}
// Draw two ellipses centered about the same point, one
// rotated 45 degrees from the other.
CGContextSaveGState(context);
// Ellipse 1
createEllipsePath(context, theCenterPoint, theEllipseSize);
CGContextSetFillColorWithColor(context, opaqueBrownColor);
CGContextFillPath(context);
// Translate and rotate about the center point of the ellipse.
CGContextTranslateCTM(context, theCenterPoint.x, theCenterPoint.y);
// Rotate by 45 degrees.
CGContextRotateCTM(context, DEGREES_TO_RADIANS(45));
// Ellipse 2
// CGPointZero is a pre-defined Quartz point corresponding to
// the coordinate (0,0).
createEllipsePath(context, CGPointZero, theEllipseSize);
CGContextSetFillColorWithColor(context, opaqueOrangeColor);
CGContextFillPath(context);
CGContextRestoreGState(context);
CGContextTranslateCTM(context, 170., 0.);
// Now use the first ellipse as a clipping area prior to
// painting the second ellipse.
CGContextSaveGState(context);
// Ellipse 3
createEllipsePath(context, theCenterPoint, theEllipseSize);
CGContextSetStrokeColorWithColor(context, opaqueBrownColor);
CGContextSetLineDash(context, 0, dash, 1);
// Stroke the path with a dash.
CGContextStrokePath(context);
// Ellipse 4
createEllipsePath(context, theCenterPoint, theEllipseSize);
// Clip to the elliptical path.
CGContextClip(context);
CGContextTranslateCTM(context, theCenterPoint.x, theCenterPoint.y);
// Rotate by 45 degrees.
CGContextRotateCTM(context, DEGREES_TO_RADIANS(45));
// Ellipse 5
createEllipsePath(context, CGPointZero, theEllipseSize);
CGContextSetFillColorWithColor(context, opaqueOrangeColor);
CGContextFillPath(context);
CGContextRestoreGState(context);
}
