CODEWITHSUNDEEP
objective-cdrawingcore-graphicscgcontext
Tomasz Szulc
Tomasz Szulc

Reputation: 4235

Filling a path with a particular color

I want to fill a path with red. This is my code:

CGFloat red[4] = {1.0f, 0.0f, 0.0f, 1.0f};
CGContextBeginPath(c);
CGContextSetStrokeColor(c, red);
CGContextSetFillColorWithColor(c, [UIColor whiteColor].CGColor);
CGContextMoveToPoint(c, 10, 10);
CGContextAddLineToPoint(c, 20, 20);
CGContextAddLineToPoint(c, 20, 40);
CGContextAddLineToPoint(c, 40, 20);
CGContextAddLineToPoint(c, 10, 10);
CGContextStrokePath(c);
CGContextFillPath(c);

I know that I have to use CGContextSetFillColor() and CGContextFillPath(), but it's not working.

How can I do this correctly?

Upvotes: 2

Views: 5028

Answers (3)

ergunkocak
ergunkocak

Reputation: 3380

For swift use :

CGContextSetFillColorWithColor(context, UIColor.blackColor().CGColor)
CGContextFillPath(context)

Upvotes: 0

Tomasz Szulc
Tomasz Szulc

Reputation: 4235

Answer in my case is:

CGContextRef context = UIGraphicsGetCurrentContext();

//set fill pattern
UIColor *patternRed = [UIColor colorWithPatternImage:[UIImage imageNamed:@"patternRed.png"]];

CGContextSetLineWidth(context, 1.0);
CGContextSetFillColorWithColor(context, patternRed.CGColor);

CGMutablePathRef pathRef = CGPathCreateMutable();

CGPathMoveToPoint(pathRef, NULL, 0, self.frame.size.height);
for (int i = 0; i<255; ++i) {
    CGPathAddLineToPoint(pathRef, NULL, stepX*arrayX[i], self.frame.size.height - (arrayYRed[i]*stepY));
}
CGPathAddLineToPoint(pathRef, NULL, stepX*255, self.frame.size.height);
CGContextAddPath(context, pathRef);
CGContextFillPath(context);

CGPathRelease(pathRef);

Upvotes: 3

orta
orta

Reputation: 4295

You don't set a line width on the above example, so here's a sane example that will draw a line down the left hand side of a rect. Taken directly from a drawRect function

CGContextRef context = UIGraphicsGetCurrentContext();
[[UIColor whiteColor] setFill];
CGContextFillRect(context, rect);

CGContextSetLineWidth(context, 2);
CGFloat gray[4] = {0.5f, 0.5f, 0.5f, 1.0f};
CGContextSetStrokeColor(context, gray);

// left
CGContextMoveToPoint(context, 0, 0);
CGContextAddLineToPoint(context, 0, CGRectGetHeight(rect));

CGContextStrokePath(context);

Upvotes: 0

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