Question

C#窗体程序求助，怎么写条件让label标签沿着窗体周边移动

我只写了对角线移动，但是不懂怎么写周边移动，上图。求大神





Answer 1

//顺时针动的：
void btnMove_Click(object sender,EventArgs e){
	lb1Logo.Left=0;
	lb1Logo.Top=0;
	Timer.Enabled=true;
}
int moveD=1;
const int MoveUp=0;
const int MoveRight=1;
const int MoveDown=2;
const int MoveLeft=3;

void Timer_Tick(object sender,EventArgs e){
	switch (moveD){
		case MoveUp:		
		lb1Logo.Top-=10;
		if(lb1Logo.Top<0){
			lb1Logo.Top=0;
			moveD++;
		}
		break;
		case MoveRight:
		lb1Logo.Left+=10;
		if(lb1Logo.Right>this.Width){
			lb1Logo.Right=this.Width;
			moveD++;
		}
		break;
		case MoveDown:		
		lb1Logo.Top+=10;
		if(lb1Logo.Bottom>this.Height){
			lb1Logo.Top=this.Height;
			moveD++;
		}
		break;
		case MoveLeft:
		lb1Logo.Left-=10;
		if(lb1Logo.Left<0){
			lb1Logo.Left=0;
			moveD=MoveUp;
		}
		break;
	}
}

追问

case MoveRight:
lb1Logo.Left+=10;
if(lb1Logo.Right>this.Width){
lb1Logo.Right=this.Width; // lb1Logo.Right ，这里无法被赋值是怎么回事

追答

lb1Logo.Left=this.Width-lb1Logo.Width;

Answer 2

您好，您这样：bool isdown;//鼠标左键是否按下
Point mousepos;//鼠标位置
private void label1_MouseDown(object sender, MouseEventArgs e)
{

if (e.Button == MouseButtons.Left)
{
isdown = true;//鼠标按下
}
}

private void label1_MouseMove(object sender, MouseEventArgs e)
{

if (isdown)
{
mousepos.Offset(e.X , e.Y);
this.label1.Location = mousepos;//label控件的位置
}

}

private void label1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
isdown = false;//释放鼠标左键
}