我做了一个系统来使用鼠标选择一个区域。但是，当我选择该区域时，如下所示：
对不起我的英语，我是巴西人...
我的代码：
private void ResizeSelection()
{
if (CurrentAction == ClickAction.LeftSizing)
{
if (Cursor.Position.X < CurrentBottomRight.X - 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentTopLeft.X = Cursor.Position.X;
RectangleWidth = CurrentBottomRight.X - CurrentTopLeft.X;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
if (CurrentAction == ClickAction.TopLeftSizing)
{
if (Cursor.Position.X < CurrentBottomRight.X - 10 && Cursor.Position.Y < CurrentBottomRight.Y - 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentTopLeft.X = Cursor.Position.X;
CurrentTopLeft.Y = Cursor.Position.Y;
RectangleWidth = CurrentBottomRight.X - CurrentTopLeft.X;
RectangleHeight = CurrentBottomRight.Y - CurrentTopLeft.Y;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
if (CurrentAction == ClickAction.BottomLeftSizing)
{
if (Cursor.Position.X < CurrentBottomRight.X - 10 && Cursor.Position.Y > CurrentTopLeft.Y + 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentTopLeft.X = Cursor.Position.X;
CurrentBottomRight.Y = Cursor.Position.Y;
RectangleWidth = CurrentBottomRight.X - CurrentTopLeft.X;
RectangleHeight = CurrentBottomRight.Y - CurrentTopLeft.Y;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
if (CurrentAction == ClickAction.RightSizing)
{
if (Cursor.Position.X > CurrentTopLeft.X + 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentBottomRight.X = Cursor.Position.X;
RectangleWidth = CurrentBottomRight.X - CurrentTopLeft.X;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
if (CurrentAction == ClickAction.TopRightSizing)
{
if (Cursor.Position.X > CurrentTopLeft.X + 10 && Cursor.Position.Y < CurrentBottomRight.Y - 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentBottomRight.X = Cursor.Position.X;
CurrentTopLeft.Y = Cursor.Position.Y;
RectangleWidth = CurrentBottomRight.X - CurrentTopLeft.X;
RectangleHeight = CurrentBottomRight.Y - CurrentTopLeft.Y;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
if (CurrentAction == ClickAction.BottomRightSizing)
{
if (Cursor.Position.X > CurrentTopLeft.X + 10 && Cursor.Position.Y > CurrentTopLeft.Y + 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentBottomRight.X = Cursor.Position.X;
CurrentBottomRight.Y = Cursor.Position.Y;
RectangleWidth = CurrentBottomRight.X - CurrentTopLeft.X;
RectangleHeight = CurrentBottomRight.Y - CurrentTopLeft.Y;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
if (CurrentAction == ClickAction.TopSizing)
{
if (Cursor.Position.Y < CurrentBottomRight.Y - 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentTopLeft.Y = Cursor.Position.Y;
RectangleHeight = CurrentBottomRight.Y - CurrentTopLeft.Y;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
if (CurrentAction == ClickAction.BottomSizing)
{
if (Cursor.Position.Y > CurrentTopLeft.Y + 10)
{
//Erase the previous rectangle
g.DrawRectangle(EraserPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
CurrentBottomRight.Y = Cursor.Position.Y;
RectangleHeight = CurrentBottomRight.Y - CurrentTopLeft.Y;
g.DrawRectangle(MyPen, CurrentTopLeft.X, CurrentTopLeft.Y, RectangleWidth, RectangleHeight);
}
}
}
我想知道是否有办法解决这个问题或让它变得透明，只显示矩形的边缘。谢谢，