javascript - 旋转实体以查看鼠标(Craftyjs)

Question

我一直在尝试让我的播放器实体旋转到鼠标，但是我无法触发 MouseMove 事件。

Crafty.e("2D, Mouse, Canvas, Color"
   .attr({ w:1000, h:1000, x:0, y:0 })
   .bind('MouseMove', function(e)
   {
         console.log("Mouse Pos:"+ e.x +","+e.y);
        //get hero
         var pos1 = {
           x: e.x,
           y: e.y
         }
         var pos2 = {
           x: player.x,
           y: player.y
         }
         player.rotation = 0;
         player.rotation = -Engine.degree(pos1, pos2);


     })

当我将 MouseMove 替换为 click 或 mousedown 或任何其他鼠标事件时，它会在该事件发生时旋转到鼠标。但是它从不调用 mousemove 函数。我做错了什么？

Answer 1

看看CraftyMouseFace ，一个 Crafty 组件 made by the community :

This component does the following:

• It finds the angle between given Sprite and mouse position and triggers a Crafty event which holds information about current mouse position and calculated angle in radians and degrees.
• Determines sprite facing direction.
• Triggers Crafty events when a mouse buttons is pressed down or released up anywhere on the game screen.

第一个功能听起来正是您所需要的。

让我们将 MouseMoved 事件及其事件数据放在以下代码段中进行测试。
四处移动鼠标指针，注意绿色矩形如何旋转以面向指针。

Crafty.init();

Crafty.e("2D, DOM, Color, MouseFace")
    .attr({x: 75, y: 75, w: 60, h: 60})
    .origin("center")
    .color('green')
    .bind("MouseMoved", function(data) {
        this.rotation = data.rad * 180 / Math.PI;
    });

<script src="https://github.com/craftyjs/Crafty/releases/download/0.7.1/crafty-min.js"></script>
<script src="https://cdn.rawgit.com/petarov/CraftyMouseFace/master/src/craftyMFace.js"></script>