bitmap - EaselJS:有问题的拖/放

Question

我在容器内有一个位图。当我拖动容器时，光标变为编辑文本形状，图像也跳到光标的右下角(好像我从左上角拿着图像并拖动它)。

这是我的代码，所以你可以看到我有 RTFM:

function createIcon(imgPath) {
    var image = new Image();
    image.onload = function () {
        var img = new createjs.Bitmap(event.target)

        var con = new createjs.Container();
        con.x = 160;
        con.y = 100;
        con.addChild(img);
        stage.addChild(con);

        con.on("pressmove", function(evt) {
            evt.currentTarget.x = evt.stageX;
            evt.currentTarget.y = evt.stageY;
            stage.update();
        });

        stage.update();
    }

    image.src = imgPath;
}

任何想法有什么问题？

Answer 1

为了防止跳跃，您必须在 pressmove 之前添加一个额外的步骤:

con.on('mousedown', function(evt) {
    var ct = evt.currentTarget,
        local = ct.globalToLocal(evt.stageX, evt.stageY),
        nx = ct.regX - local.x,
        ny = ct.regY - local.y;
    //set the new regX/Y
    ct.regX = local.x;
    ct.regY = local.y;
    //adjust the real-position, otherwise the new regX/Y would cause a jump
    ct.x -= nx;
    ct.y -= ny;
});

这会将新的 regX/Y 设置为当前的鼠标位置，以防止形状/图像跳跃。

对于光标:
您可以通过 CSS 进行设置:

canvas {
    cursor: default !important; /* in this case you couldn't set any other cursor via EaselJS though */
}

或者您可以通过 EaselJS 进行设置: http://www.createjs.com/Docs/EaselJS/classes/DisplayObject.html#property_cursor

con.cursor = "default"; //or 'pointer'...or whatever cursor you want it to be
// you have to activate enableMouseOver though on the stage for this to work