iphone - 在iphone中的两点之间画线？
<p><p> <img src="/image/TIeaE.png" alt="enter image description here"/>
上图为红点，我喜欢加入红点。</p>
<p>我喜欢在两点之间画一条线，我在 ImageView 中有图像，我喜欢标记图像的某些部分以指示该点，使用触摸事件放置点</p>
<pre><code> -(void) drawRect:(CGRect)rect
{
if(==4)
{
float firstpointx= [floatValue];
float firstpointy= [floatValue];
float secondpointx= [floatValue];
float secondpointy= [floatValue];
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetStrokeColorWithColor(ctx, .CGColor);
CGContextSetLineWidth(ctx, 2.0);
CGContextMoveToPoint(ctx, firstpointx, firstpointy);///move to ur first dot
CGContextAddLineToPoint(ctx, secondpointx, secondpointy);//add line from first dot to second dot
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextStrokePath(ctx);
;//remove first two points from ur array so that next line is not drawn in continuous with previous line
}
}
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
pointarray=[init];
CGPoint curPoint = [ locationInView:self.view];
];
];
NSLog(@"the point array is %@",pointarray);
; // calls drawRectMethod
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = ;
if ( == 2) {
imageView.image = nil;
return;
}
if(!mouseSwiped) {
UIGraphicsBeginImageContext(self.view.frame.size);
;
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}
</code></pre>
<p>在我将我的点放置在这里之后如何连接这两个点，有人可以帮助我!!!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>使用下面的代码就可以了:-</p>
<pre><code>- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = NO;
UITouch *touch = ;
if ( == 2) {
pathForResource:@"white" ofType:@"png"]]];
return;
}
lastPoint = ;
lastPoint.y -= 20;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;
UITouch *touch = ;
CGPoint currentPoint = ;
currentPoint.y -= 20;
NSLog(@"current Point is x: %d, y: %d",currentPoint.x,currentPoint.y);
UIGraphicsBeginImageContext(self.drawImage.frame.size);
;
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.5, 0.6, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastPoint = currentPoint;
}
</code></pre>
<p>欢迎提问..</p></p>
<p style="font-size: 20px;">关于iphone - 在iphone中的两点之间画线？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/8208469/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/8208469/
</a>
</p>
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