KineticJS - 检测多个图像的碰撞

时间:2014-02-26 19:53:00

标签: canvas html5-canvas collision-detection kineticjs

我创建了一个包含多个图像的图层。通过拖放,您可以在画布周围移动图像。在“dragend”事件中,我想检查实际图像是否位于任何其他图像上。

我将所有Kinetic.Image对象推入一个数组:形状。

function start() {

for (var i = 0; i < imgs.length; i++) {
    var img = new Kinetic.Image({
        x: i * 75 + 15,
        y: i * 75 + 15,
        width: 60,
        height: 60,
        image: imgs[i],
        id: "img" + i,
        draggable: true
    });
    layer.add(img);

    img.on('dragend', function(e) {
        var shape = e.targetNode;
        doObjectsCollide(shape);
    });
    shapes.push(img);
}

layer.draw();

}

我找到了SO Question,它描述了两个元素之间碰撞的检测。我为我的情况尝试了解决方案,但在拖动结束后,没有检测到碰撞:

doObjectsCollide = function(a) {
  for (var i = 0; i < shapes.length; i++) {
    b = shapes[i];
    if (a.id != b.id) {
        if (
            ((a.getY() + a.getHeight()) < (b.getY())) ||
            (a.getY() > (b.y + b.getHeight())) ||
            ((a.getX() + a.getWidth()) < b.getX()) ||
            (a.getX() > (b.getX() + b.getWidth()))
        ) { console.log("Detection")};
    }
  }
}

循环有问题吗?或者形状是图像的事实?

1 个答案:

答案 0 :(得分:1)

一些小故障:

  • 将ids作为函数调用:if(a.id()!= b.id())

  • 您的碰撞测试必须是不合理的:if(!(...))

所以doObjectsCollide应如下所示:

doObjectsCollide = function(a) {

  for (var i = 0; i < shapes.length; i++) {
    b = shapes[i];
    if (a.id() != b.id()) {
        if (
            !(((a.getY() + a.getHeight()) < (b.getY())) ||
            (a.getY() > (b.y + b.getHeight())) ||
            ((a.getX() + a.getWidth()) < b.getX()) ||
            (a.getX() > (b.getX() + b.getWidth())))
        ) { console.log("Detection: "+a.id()+" hit "+b.id())};
    }
  }
}

这是一个演示:http://jsfiddle.net/m1erickson/PFH55/

干杯!