Fading Paths ???

Scripting Forums AppleScript Studio & Xcode
#1

hello everyone,

i would like to know how to code for this: everytime i click generate i want the previous path’s colors to change into a different color.

THANKS

#import “RanWithParameters.h”

@implementation RanWithParameters

  • (id)initWithFrame:(NSRect)rect
    {
    NSLog(@“-------------initWithFrame------------------”);
    if (self = [super initWithFrame:rect])
    {
    transform = [[NSAffineTransform alloc] init];
    path = [[NSBezierPath alloc] init];
    }
    return self;
    }

  • (IBAction)generate:(id)sender
    {
    NSLog(@“generate”);
    [self drawRandomLine];
    [self setNeedsDisplay:YES];

}

  • (void)drawRandomLine
    {
    int i;
    NSPoint p;

    //Create a path object
    [path setLineWidth:2.0];
    p = [self randomPoint:0];
    [path moveToPoint: p];

    for (i = 0; i <= 10; i++)
    {
    p = [self randomPoint:i];
    [path lineToPoint: p];
    }
    }

// randomPoint returns a random point inside the view

  • (NSPoint)randomPoint:(long)index
    {
    NSPoint result;
    result.y = (random() % 100) -50;
    result.x = index + 0;

    return result;
    }

//Setting scales

  • (void)setScale:(NSRect)bounds
    {
    NSAffineTransformStruct I, unitsToPix;

    NSLog(@“setScale”);

    I.m11 = 1;
    I.m12 = 0;
    I.m21 = 0;
    I.m22 = 1;
    I.tX = 0;
    I.tY = 0;

    [transform setTransformStruct:I];
    [transform translateXBy: bounds.origin.x yBy: bounds.origin.y + bounds.size.height/2.0];
    [transform scaleXBy: bounds.size.width/10 yBy: bounds.size.height/100];

    unitsToPix = [transform transformStruct];

    NSLog(@“unitsToPix.m11=%f unitsToPix.m12=%f unitsToPix.m21=%f unitsToPix.m22=%f unitsToPix.tX=%f unitsToPix.tY=%f”,
    unitsToPix.m11, unitsToPix.m12, unitsToPix.m21, unitsToPix.m22, unitsToPix.tX, unitsToPix.tY);
    }

  • (void)drawRect:(NSRect)rect
    {
    NSRect bounds;

    NSLog(@“======= drawRect ======”);

    bounds = [self bounds];

    [self setScale:bounds];

    //Fill the view with black
    [[NSColor blackColor] set];
    [NSBezierPath fillRect:bounds];

    // Draw the path red
    [[NSColor greenColor] set];

    [path transformUsingAffineTransform: transform]; // transform path in units to path in pixels
    [path stroke]; // draw path in pixels
    [transform invert]; // invert transform to go from pixels to units
    [path transformUsingAffineTransform: transform]; // transform path in pixels back to path in units
    [transform invert]; // invert transform back to take us from units to pixels
    }

  • (void)dealloc
    {
    [path release];
    [transform release];
    [super dealloc];
    }

@end