On Oct 10, 2009, at 11:41 AM, Jos Timanta Tarigan wrote:
i got a very basic question on iphone development. so i add an
uiview via IB and try to update it by making my own interface called
updateInterface(). in the update interface i put this code:
Why would you do that instead of using the UIView method intended to
do drawing, -drawRect:?
Subclass UIView, and put the following code into it.
CGRect frame = [polyView frame];
NSArray*polypath = [[selfclass]pointsForPolygonInRect:frame
numberOfSides:[myPolynumberOfSides]];
CGContextRefmyContext = UIGraphicsGetCurrentContext();
int i = 0;
CGContextSetRGBStrokeColor(myContext, 0, 0, 1, 1);
for (NSValue* value in polypath) {
CGPoint point = [value CGPointValue];
if (i == 0) {
CGContextMoveToPoint(myContext, point.x, point.y);
i++;
}
else {
CGContextAddLineToPoint(myContext, point.x, point.y);
}
}
CGContextClosePath(myContext);
im trying to draw a polygon here built by lines from one point to
antoher. the "pointsForPolygonInRect" is working properly but my
UIview(polyView) isnt showing anything. i dont really understand
what happened up there, i just googled it around working for a
proper method. im very new to cocoa-dev so please do a more human
language ;)
You might also want to actually *draw* the path; see "Painting Paths" <file:///Library/Developer/Shared/Documentation/DocSets/com.apple.adc.documentation.AppleiPhone3_0.iPhoneLibrary.docset/Contents/Resources/Documents/documentation/GraphicsImaging/Reference/CGContext/Reference/reference.html#//apple_ref/doc/uid/TP30000950-CH1g-TPXREF107
> (you set the stroke color, but then don't actually stroke the path).
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