移动多个物体

问题描述

我正在使用使用C#的XNA2D.我是C#的新手
我正在尝试移动一组对象.到目前为止，我一次只能移动一个对象.
这是我的代码.

I am using XNA2D which uses C#. I am new to C#
i am trying to move a group of objects around. So far, i am able to move only one object at a time.
Here is my code.

if (input == null)
{
    throw new ArgumentNullException("input"");
}

mouseStateCurrent = Mouse.GetState();
drag = Vector2.Zero;

foreach (ALU a in ALU.List)
{
    if (a.Rectangle.Contains(mouseStatePrevious.X, mouseStatePrevious.Y) && 
        !dragging && 
        mouseStateCurrent.LeftButton == ButtonState.Pressed)
    {
        selectedALU = a;
        dragging = true;
        drag.X = selectedALU.Position.X - mouseStatePrevious.X;
        drag.Y = selectedALU.Position.Y - mouseStatePrevious.Y;
    }

    if (mouseStateCurrent.LeftButton == ButtonState.Released)
    {
        if (dragging)
        {
            selectedALU.Position.X = (float)((Math.Round(selectedALU.Position.X / 64)) * 64);
            selectedALU.Position.Y = (float)((Math.Round(selectedALU.Position.Y / 64)) * 64);
        }

        dragging = false;
    }
    mouseStatePrevious = mouseStateCurrent;
}

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