CGPathContainsPoint问题?

时间:2010-02-14 23:41:21

标签: iphone sdk fill area cgpath

这是在GameViewController.m

-(void)fillMutablePath{



    CGPoint movePoint = CGPointFromString([pointsToFillArray objectAtIndex:0]);

    CGPathMoveToPoint(fillPath, NULL, movePoint.x, movePoint.y);
    for (int i=0; i<[pointsToFillArray count]; i++) {
        CGPoint tempPoint = CGPointFromString([pointsToFillArray objectAtIndex:i]);
        CGPathAddLineToPoint(fillPath, NULL, tempPoint.x, tempPoint.y);
        CGContextAddPath(gameViewObj._myContext, fillPath);
        CGContextFillPath(gameViewObj._myContext);

        if(CGPathContainsPoint(fillPath, nil, "What goes here?", false)){
            [self doDie];
        }
else {
  CGContextFillPath(gameViewObj._myContext);
}
        CGPathRelease(fillPath);
        [pointsToFillArray removeAllObjects];
    }


}

这是在GameView.m

-(CGPoint) GetBirdPosition:(CGPoint) PtPoint :(int) BirdNumber{
    CGPoint Temp=PtPoint;
    BOOL isTouch=TRUE;
    while (isTouch)
    {
        isTouch=FALSE;
        if(playField[(int) Temp.x][(int) Temp.y]==2)
        {
            isTouch=TRUE;
            if(playField[(int) Temp.x+1][(int) Temp.y] == 2 || playField[(int) Temp.x-1][(int) Temp.y] == 2)
            {
                pos[BirdNumber].y = -pos[BirdNumber].y;
                Temp.y+=pos[BirdNumber].y;

            }
            else if(playField[(int) Temp.x][(int) Temp.y+1] == 2 || playField[(int) Temp.x][(int) Temp.y-1] == 2)
            {
                pos[BirdNumber].x = -pos[BirdNumber].x;
                Temp.x+=pos[BirdNumber].x;
            }

        }
    }
    return Temp;
}

-(void)flyingBird:(NSTimer *)timer {

    if(appDelegate.gameStateRunning == YES){

        for (int i=0; i< [birdImageViewArray count];i++)
        {
            UIImageView* birdImageView=[birdImageViewArray objectAtIndex:i];

            CGPoint Temp=CGPointMake(birdImageView.center.x + pos[i].x , birdImageView.center.y + pos[i].y);
            birdImageView.center =[self GetBirdPosition:Temp:i];

            if(playField[(int) birdImageView.center.x][(int) birdImageView.center.y]==3){

                [[NSNotificationCenter defaultCenter] postNotificationName:@"LineCrossed" object:nil];
                [[NSNotificationCenter defaultCenter] postNotificationName:@"PlayDieSound" object:nil];
            }
        }
    }
}

我无法弄清楚在哪里写了“什么在这里”?我想要它,如果一只鸟被困在形状内,那么[doDie]就会发生。如果鸟没有被困在形状内,它就会被填满。任何想法都非常感激。

1 个答案:

答案 0 :(得分:1)

我真的不了解你的代码,但我想这基本上就是你想做的事情:

CGPoint Temp=CGPointMake(birdImageView.center.x + pos[birdNum].x , birdImageView.center.y + pos[birdNum].y);
if(CGPathContainsPoint(fillPath, nil, [myGameView GetBirdPosition:Temp:i], false)){
    [self doDie];
}

看起来你的路径最初只是一条线,我认为它不会被包含在内。如果你更彻底地解释目标(我们检查了多少只鸟?它们是否相同?)我们可以进一步帮助。

编辑:

嗯,好的。首先,这很简单。如果路径中有任何鸟类,为了防止填充,请不要使用其他情况。在if中,如果当前鸟包含在路径中,则设置一个标志。然后在循环之后,如果未设置标志,则填充路径。如下所示:

BOOL pathContainsBird = NO;
for (int i=0; i<[pointsToFillArray count]; i++) {
    //bunch of stuff
    if(CGPathContainsPoint(fillPath, nil, "What goes here?", false)){
        pathContainsBird = YES;
        [self doDie];
    }
}
if(!pathContainsBird) {
    //fill path here
}

其次,我很确定你没有绕过正确的事情。看起来你每次迭代都会扩展路径,但我认为你应该首先构建整个路径,然后循环遍历所有的鸟类,但我可能会误解。