drawing a Line in a couple of frames with Quartz 2d [closed] - objective-c

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I am an Objective C Programmer. I am developing a universal App.
In this App i want to use Quartz to draw a square, but not completely in one frame, rather frame for frame. In the Code below there is a possibility. But its not so good, because i want to draw rectangles, circles and other stuff. So, is there a better way to draw such things.
-(void)drawRect:(CGRect)rect {
[self drawARect];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 20.0);
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
CGFloat components[] = {0.0, 0.0, 1.0, 1.0};
CGColorRef color = CGColorCreate(colorspace, components);
CGContextSetStrokeColorWithColor(context, color);
if (!firstLineReady) {
CGContextMoveToPoint(context, 200, 200);
CGContextAddLineToPoint(context, x, y);
}
if (firstLineReady && !secondLineReady) {
CGContextMoveToPoint(context, 200, 200);
CGContextAddLineToPoint(context, 600, 200);
CGContextMoveToPoint(context, 600, 200);
CGContextAddLineToPoint(context, x, y);
}
if (secondLineReady && !thirdLineReady) {
CGContextMoveToPoint(context, 200, 200);
CGContextAddLineToPoint(context, 600, 200);
CGContextMoveToPoint(context, 600, 200);
CGContextAddLineToPoint(context, 600, 600);
CGContextMoveToPoint(context, 600, 600);
CGContextAddLineToPoint(context, x, y);
}
if (thirdLineReady && ! fourthLineReady) {
CGContextMoveToPoint(context, 200, 200);
CGContextAddLineToPoint(context, 600, 200);
CGContextMoveToPoint(context, 600, 200);
CGContextAddLineToPoint(context, 600, 600);
CGContextMoveToPoint(context, 600, 600);
CGContextAddLineToPoint(context, 200, 600);
CGContextMoveToPoint(context, 200, 600);
CGContextAddLineToPoint(context, x, y);
}
if (fourthLineReady) {
CGContextMoveToPoint(context, 200, 200);
CGContextAddLineToPoint(context, 600, 200);
CGContextMoveToPoint(context, 600, 200);
CGContextAddLineToPoint(context, 600, 600);
CGContextMoveToPoint(context, 600, 600);
CGContextAddLineToPoint(context, 200, 600);
CGContextMoveToPoint(context, 200, 600);
CGContextAddLineToPoint(context, 200, 200);
[timer invalidate];
}
CGContextStrokePath(context);
CGColorSpaceRelease(colorspace);
CGColorRelease(color);
}
- (void) drawARect{
if (!firstLineReady) {
x+=speed; y+=0;
if (x>=600) {
x=600;
firstLineReady = YES;
}
}
if (firstLineReady && !secondLineReady ) {
x+=0; y+=speed;
if (y>=600) {
y=600;
secondLineReady = YES;
}
}
if (firstLineReady && secondLineReady && !thirdLineReady ) {
x-=speed; y+=0;
if (x<=200) {
x=200;
thirdLineReady = YES;
}
}
if (firstLineReady && secondLineReady && thirdLineReady ) {
x+=0; y-=speed;
if (y<=200) {
y=200;
fourthLineReady = YES;
}
}
}
Is it possible to give the CGContextAddLineToPoint a custom Pattern like a pencil or a biro?

Answer 1

Oval
CGRect aRect= CGRectMake(80, 80, 160, 100);
CGContextSetRGBStrokeColor(context, 0.6, 0.9, 0, 1.0);
CGContextSetLineWidth(context, 3.0);
CGContextAddEllipseInRect(context, aRect); //椭圆
CGContextDrawPath(context, kCGPathStroke);
Diamond
CGContextSetLineWidth(context, 2.0);
CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
CGContextMoveToPoint(context, 100, 100);
CGContextAddLineToPoint(context, 150, 150);
CGContextAddLineToPoint(context, 100, 200);
CGContextAddLineToPoint(context, 50, 150);
CGContextAddLineToPoint(context, 100, 100);
CGContextStrokePath(context);
Rectangle
CGContextSetLineWidth(context, 2.0);
CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
CGRect rectangle = CGRectMake(60,170,200,80);
CGContextAddRect(context, rectangle);
CGContextStrokePath(context);
or you can get the opensource code from github