Line End Points (Animated)

C4WorkSpace.m

//
//  C4WorkSpace.m
//  Examples
//
//  Created by Travis Kirton on 12-07-19.
//

#import "C4WorkSpace.h"

@interface C4WorkSpace ()
-(void)animate;
@end

@implementation C4WorkSpace {
    C4Shape *line1, *line2, *line3;
}

-(void)setup {
    //create a set of default points for all the lines
    CGPoint linePoints[2];
    linePoints[0] = CGPointMake(self.canvas.center.x-100, self.canvas.center.y);
    linePoints[1] = CGPointMake(linePoints[0].x+200, self.canvas.center.y);

    //create each line and style it, if necessary
    line1 = [C4Shape line:linePoints];

    line2 = [C4Shape line:linePoints];
    line2.strokeColor = C4BLUE;
    
    line3 = [C4Shape line:linePoints];
    line3.strokeColor = C4GREY;
    
    //add all the lines to the canvas
    [self.canvas addShape:line3];
    [self.canvas addShape:line2];
    [self.canvas addShape:line1];

    //animate them after a short delay
    [self runMethod:@"animate" afterDelay:0.1f];
}

-(void)animate {
    //animate the line2 with a repeating 1 second animation
    line2.animationDuration = 1.0f;
    line2.animationOptions = AUTOREVERSE | REPEAT;
    CGPoint newPointA;
    newPointA = line2.pointA;
    newPointA.y += 200;
    line2.pointA = newPointA;

    //animate the line3 with a repeating 1 second animation
    line3.animationDuration = 1.0f;
    line3.animationOptions = AUTOREVERSE | REPEAT;
    CGPoint newPointB;
    newPointB = line3.pointB;
    newPointB.y -= 200;
    line3.pointB = newPointB;
}
@end