鼠标按下并向下移动
有什么问题吗？
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
position_x = e.Location.X;
position_y = e.Location.Y;
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
int position_x_next = e.Location.X;
int position_y_next = e.Location.Y;
if (position_x_next < position_x)
{
MessageBox.Show("it moved left");
}
}
What's wrong with it?
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
position_x = e.Location.X;
position_y = e.Location.Y;
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
int position_x_next = e.Location.X;
int position_y_next = e.Location.Y;
if (position_x_next < position_x)
{
MessageBox.Show("it moved left");
}
}
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评论（5）
您需要跟踪鼠标的先前位置和新位置。
创建 2 个新变量：
mouseIsDown和previousMouseX。在
MouseDown处理程序中，将mouseIsDown设置为true，将previousMouseX设置为mouse.x并在MouseUp处理程序中将其设置为false。然后，添加一个
MouseMove处理程序来检查previousMouseX是否大于mouse.x。如果是这样，则鼠标向左移动。请务必在此处更新previousMouseX。You need to keep track of the previous position of the mouse and the new position.
Create 2 new variables,
mouseIsDownandpreviousMouseX.In your
MouseDownhandler, setmouseIsDowntotrueandpreviousMouseXtomouse.xand set it tofalsein aMouseUphandler.Then, add a
MouseMovehandler that checks ifpreviousMouseXis greater thanmouse.x. If so, the mouse is moving left. Make sure to updatepreviousMouseXhere as well.您应该检查
MouseEventArgs每次查看按钮何时按下并捕获 X 和 Y 坐标 - 如果 X 坐标小于上次的值，您可以判断它正在向左移动。You should be checking the
MouseEventArgsevery time to see when the button is down and to capture the X and Y coordinates - you can tell it is moving left if the X coordinate is less than it was the last time.实际上很简单。存储它在上次移动事件中的位置（位于
e参数中）。然后将当前位置与上一个位置进行比较。如果它的 X 坐标位于左侧，则它会向左移动。例如，如果您想区分精确向左移动和对角线左上移动，您应该添加一个条件来检查 Y 轴的变化是否足够小以解决用户不精确的问题。
It's pretty simple actually. Store the position it was in the last move event (it's in the
eparameter). Then compare the current position with the last one. If its X coordinate is to the left it's moving left.If you want to distinguish moving exactly left from moving diagonally left-up for instance, you should add a condition to check if the variation in the Y axis is small enough to account for user imprecision.
俗气的方法：
在鼠标按下事件中设置一个标志 IsMouseDown = true。
在鼠标移动事件中检查 IsMouseDown == true
在 MouseUp 中设置 IsMouseDown = true
The cheesy way:
Set a flag in the mouse down event IsMouseDown = true.
In the mouse move event check if IsMouseDown == true
In MouseUp set IsMouseDown = true
鼠标移动事件并传递 X 和 Y 坐标怎么样
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.mousemove(VS.71).aspx
http://www.java2s.com/Code/CSharp/Event/MouseMovement.htm
What about the mouse move event and passing the X and Y cordinates
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.mousemove(VS.71).aspx
http://www.java2s.com/Code/CSharp/Event/MouseMovement.htm