objective-c - NSBezierPath 独特的线条

Question

我正在制作一个简单的绘图应用程序，并使用 NSBezierPath 来绘制线条。我正在对 NSView 进行子类化。我需要制定一种方法，允许用户更改下一条路径的颜色和大小(因此用户按下一个按钮，然后下次他们绘制路径时，它就是指定的颜色/大小)，但现在当我尝试时这样做会改变所有现有路径的颜色和大小。可以这么说，我怎样才能使它们成为“个体”呢？这是我的代码:

- (void)drawRect:(NSRect)dirtyRect
{


    [path setLineWidth:5];

    [path setLineJoinStyle:NSRoundLineJoinStyle];
    [path setLineCapStyle:NSRoundLineCapStyle];

    [path stroke];


}

- (void)mouseDown:(NSEvent *)theEvent {

    NSPoint location = [theEvent locationInWindow];
    NSLog(@"%f, %f", location.x, location.y);

    [path moveToPoint:location];
    [self setNeedsDisplay:YES];

}

- (void)mouseUp:(NSEvent *)theEvent {

}

- (void)mouseDragged:(NSEvent *)theEvent {

    NSPoint location = [theEvent locationInWindow];
    [path lineToPoint:location];
    [self setNeedsDisplay:YES];

}

- (void)changeBrushColor:(NSString *)color {

     // change color of the next path

    [self setNeedsDisplay:YES];  // show it
}

所以我需要创建一个单独的 NSBezierPath 路径。

Answer 1

你必须使用2个可变数组(贝塞尔路径和颜色)，一个整数变量(画笔大小)。和一个用于 BrushColor 的 UIColor 变量

    -(IBAction) brushsizeFun
    {
    brushSize = 30; // any brush size here. better use a slider here to select size
    }

    -(IBAction) brushColorFun
    {
    brushColor = [UIColor redColor]; // Any color here. better use a color picker
    }


    - (void)mouseDown:(NSEvent *)theEvent {

    NSPoint location = [theEvent locationInWindow];
    NSLog(@"%f, %f", location.x, location.y);
    [path release];
    path = [[UIBezierpath alloc]init];
    path.lineWidth = brushSize;
    [path moveToPoint:location];
    [bezierArray addObject:path];
    [colorArray addObject:brushPattern];


    [self setNeedsDisplay:YES];

    }

    - (void)drawRect:(NSRect)dirtyRect
    {
    int q=0;
//Draw the bezierpath and corresonding colors from array
for (UIBezierPath *_path in bezierArray) 
{
    UIColor *_color = [colorArray objectAtIndex:q];
    [_color setStroke];
    [_path strokeWithBlendMode:kCGBlendModeNormal alpha:1.0]; 
    q++;
}

    }