Ios4 使用点数组在iPhone上绘制多条线/路径

我试图通过使用CGPoints数组绘制线来创建工程视图

我现在可以画多条线，但问题是当触摸结束时，我不知道如何断开每条线

目前的状况是- 线1一直绘制到触摸结束 再次开始触摸时，也会绘制line2，但line1端点与line2起点相连

执行情况如下：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSUInteger tapCount = [[touches anyObject] tapCount];
    if (tapCount == 2)
    {
        [pointArray removeAllObjects];
        [self setNeedsDisplay];
    }
    else
    {
        if ([pointArray count] == 0)
            pointArray = [[NSMutableArray alloc] init];
        UITouch *touch = [touches anyObject];
        start_location = [touch locationInView:self];
        [pointArray addObject:[NSValue valueWithCGPoint:start_location]];
    }
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    current_location = [touch locationInView:self];
    [pointArray addObject:[NSValue valueWithCGPoint:current_location]];
    [self setNeedsDisplay];    
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{

}



-(void)drawRect:(CGRect)rect
{
    if ([pointArray count] > 0)
    {
        int i;
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetLineWidth(context, 2.0);
        CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
        for (i=0; i < ([pointArray count] -1); i++)
        {
            CGPoint p1 = [[pointArray objectAtIndex:i]CGPointValue];
            CGPoint p2 = [[pointArray objectAtIndex:i+1]CGPointValue];
            CGContextMoveToPoint(context, p1.x, p1.y);
            CGContextAddLineToPoint(context, p2.x, p2.y);
            CGContextStrokePath(context);
        }
    }
}

start_location = [touch locationInView:self];
NSMutableArray *newLineArray = [[NSMutableArray alloc] init];
[pointArray addObject:newLineArray];
[[pointArray lastObject] addObject:[NSValue valueWithCGPoint:start_location]];

-（void）touchesbeated:（NSSet*）toucheevent:（UIEvent*）event
{
NSU整数tapCount=[[Touchs anyObject]tapCount]；
如果（tapCount==2）
{
[pointArray removeAllObjects]；
[自我设置需要显示]；
}
其他的
{
如果（[pointArray count]==0）
pointArray=[[NSMutableArray alloc]init]；
UITouch*touch=[触摸任何对象]；
开始位置=[触摸位置查看：自]；
[pointArray addObject:[NSValue valueWithCGPoint:start_location]；
}
}
-（无效）触摸移动：（NSSet*）触摸事件：（UIEvent*）事件
{
UITouch*touch=[触摸任何对象]；
当前位置=[触摸位置查看：自]；
[pointArray addObject:[NSValue valueWithCGPoint:当前_位置]；
[自我设置需要显示]；
}
-（void）touchesend:（NSSet*）toucheevent:（UIEvent*）event
{
}
-（void）drawRect:（CGRect）rect
{
如果（[pointArray count]>0）
{
int i；
CGContextRef context=UIGraphicsGetCurrentContext（）；
CGContextSetLineWidth（上下文，2.0）；
CGContextSetStrokeColorWithColor（上下文[UIColor blueColor].CGColor）；
对于（i=0；i<（[pointArray count]-1）；i++）
{
CGPoint p1=[[pointArray objectAtIndex:i]CGPointValue]；
CGPoint p2=[[pointArray objectAtIndex:i+1]CGPointValue]；
CGContextMoveToPoint（上下文，p1.x，p1.y）；
CGContextAddLineToPoint（上下文，p2.x，p2.y）；
CGContextStrokePath（上下文）；
}
}
}

请告知：-）

提前谢谢大家,

---

Dudi Shani Gabay

在这种情况下，我认为最好为单独的行保留单独的数组。让“pointArray”是一个数组，每画一条线都有若干个数组

在“touchesBegind”方法中，您需要按如下方式向pointArray添加新的数组对象：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSUInteger tapCount = [[touches anyObject] tapCount];
    if (tapCount == 2)
    {
        [pointArray removeAllObjects];
        [self setNeedsDisplay];
    }
    else
    {
        if ([pointArray count] == 0)
            pointArray = [[NSMutableArray alloc] init];
        UITouch *touch = [touches anyObject];
        start_location = [touch locationInView:self];
        [pointArray addObject:[NSValue valueWithCGPoint:start_location]];
    }
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    current_location = [touch locationInView:self];
    [pointArray addObject:[NSValue valueWithCGPoint:current_location]];
    [self setNeedsDisplay];    
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{

}



-(void)drawRect:(CGRect)rect
{
    if ([pointArray count] > 0)
    {
        int i;
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetLineWidth(context, 2.0);
        CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
        for (i=0; i < ([pointArray count] -1); i++)
        {
            CGPoint p1 = [[pointArray objectAtIndex:i]CGPointValue];
            CGPoint p2 = [[pointArray objectAtIndex:i+1]CGPointValue];
            CGContextMoveToPoint(context, p1.x, p1.y);
            CGContextAddLineToPoint(context, p2.x, p2.y);
            CGContextStrokePath(context);
        }
    }
}

start_location = [touch locationInView:self];
NSMutableArray *newLineArray = [[NSMutableArray alloc] init];
[pointArray addObject:newLineArray];
[[pointArray lastObject] addObject:[NSValue valueWithCGPoint:start_location]];

在“touchesMoved”中，您必须替换

[pointArray addObject:[NSValue valueWithCGPoint:current_location]];

以下是：

[[pointArray lastObject] addObject:[NSValue valueWithCGPoint:current_location]];

在“drawRect”方法中，“for”循环应如下所示：

for (i=0; i < [pointArray count]; i++)
{
   for (int j=0; j < ([[pointArray objectAtIndex:i] count] -1); j++)
   {
        CGPoint p1 = [[[pointArray objectAtIndex:i] objectAtIndex:j]CGPointValue];
        CGPoint p2 = [[[pointArray objectAtIndex:i] objectAtIndex:j+1]CGPointValue];
        CGContextMoveToPoint(context, p1.x, p1.y);
        CGContextAddLineToPoint(context, p2.x, p2.y);
        CGContextStrokePath(context);
   }
}

for（i=0；i<[pointArray count]；i++）
{
对于（int j=0；j<（[[pointArray objectAtIndex:i]count]-1）；j++）
{
CGPoint p1=[[pointArray objectAtIndex:i]objectAtIndex:j]CGPointValue]；
CGPoint p2=[[pointArray objectAtIndex:i]objectAtIndex:j+1]CGPointValue]；
CGContextMoveToPoint（上下文，p1.x，p1.y）；
CGContextAddLineToPoint（上下文，p2.x，p2.y）；
CGContextStrokePath（上下文）；
}
}

在这种情况下，我认为最好为单独的行保留单独的数组。让“pointArray”是一个数组，每画一条线都有若干个数组

在“touchesBegind”方法中，您需要按如下方式向pointArray添加新的数组对象：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSUInteger tapCount = [[touches anyObject] tapCount];
    if (tapCount == 2)
    {
        [pointArray removeAllObjects];
        [self setNeedsDisplay];
    }
    else
    {
        if ([pointArray count] == 0)
            pointArray = [[NSMutableArray alloc] init];
        UITouch *touch = [touches anyObject];
        start_location = [touch locationInView:self];
        [pointArray addObject:[NSValue valueWithCGPoint:start_location]];
    }
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    current_location = [touch locationInView:self];
    [pointArray addObject:[NSValue valueWithCGPoint:current_location]];
    [self setNeedsDisplay];    
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{

}



-(void)drawRect:(CGRect)rect
{
    if ([pointArray count] > 0)
    {
        int i;
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetLineWidth(context, 2.0);
        CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
        for (i=0; i < ([pointArray count] -1); i++)
        {
            CGPoint p1 = [[pointArray objectAtIndex:i]CGPointValue];
            CGPoint p2 = [[pointArray objectAtIndex:i+1]CGPointValue];
            CGContextMoveToPoint(context, p1.x, p1.y);
            CGContextAddLineToPoint(context, p2.x, p2.y);
            CGContextStrokePath(context);
        }
    }
}

start_location = [touch locationInView:self];
NSMutableArray *newLineArray = [[NSMutableArray alloc] init];
[pointArray addObject:newLineArray];
[[pointArray lastObject] addObject:[NSValue valueWithCGPoint:start_location]];

在“touchesMoved”中，您必须替换

[pointArray addObject:[NSValue valueWithCGPoint:current_location]];

以下是：

[[pointArray lastObject] addObject:[NSValue valueWithCGPoint:current_location]];

在“drawRect”方法中，“for”循环应如下所示：

for (i=0; i < [pointArray count]; i++)
{
   for (int j=0; j < ([[pointArray objectAtIndex:i] count] -1); j++)
   {
        CGPoint p1 = [[[pointArray objectAtIndex:i] objectAtIndex:j]CGPointValue];
        CGPoint p2 = [[[pointArray objectAtIndex:i] objectAtIndex:j+1]CGPointValue];
        CGContextMoveToPoint(context, p1.x, p1.y);
        CGContextAddLineToPoint(context, p2.x, p2.y);
        CGContextStrokePath(context);
   }
}

for（i=0；i<[pointArray count]；i++）
{
对于（int j=0；j<（[[pointArray objectAtIndex:i]count]-1）；j++）
{
CGPoint p1=[[pointArray objectAtIndex:i]objectAtIndex:j]CGPointValue]；
CGPoint p2=[[pointArray objectAtIndex:i]objectAtIndex:j+1]CGPointValue]；
CGContextMoveToPoint（上下文，p1.x，p1.y）；
CGContextAddLineToPoint（上下文，p2.x，p2.y）；
CGContextStrokePath（上下文）；
}
}