Question

我有一个PictureBox，其中backgroundImage设置为位图的区域，而Image设置为位图的区域，其中某些点的位置用矩形绘制我有一个MouseMove事件处理程序，其中检测到何时有人在某个点附近按下了鼠标，然后在按下鼠标时移动了点，重新绘制了位图。

问题是，仅在运动停止时才重新绘制点，但是我希望运动保持平稳，我该如何实现？

我尝试设置1ms计时器，该计时器与检查是否按下鼠标有相同的作用，但是对我来说很难在表单坐标和PictureBox坐标之间进行转换，所以我想避免这种情况

//MouseMove event codem sliders determine which part of buffer to show inside picturebox, points are drawn to OutputBuffer        
void BackgroundImage_MouseMove(object sender, MouseEventArgs e)
{
    if(MouseDown && (LEDPainterPanel != null))
        {
        LEDPainterPanel.MovePoint(e.Location, PictureHorizontalScrollBar.Value, PictureVerticalScrollBar.Value);
        OutputBuffer = LEDPainterPanel.Draw(BackgroundBuffer);
        BackgroundImage.Image = OutputBuffer.Clone
        (new Rectangle(new Point(PictureHorizontalScrollBar.Value, PictureVerticalScrollBar.Value), new Size(BackgroundImage.Width, BackgroundImage.Height)), System.Drawing.Imaging.PixelFormat.DontCare);
    }
}

//MovePoint method
public void MovePoint(Point NewCoords, int XOffset, int YOffset)
{
    if (CurrentSelectedPointNumber != 0 && CurrentSelectedStripNumber != 0)
    {
        Strips[CurrentSelectedStripNumber - 1].Points[CurrentSelectedPointNumber - 1] = new Point(NewCoords.X + XOffset, NewCoords.Y + YOffset);
    }
}

SelectPointAtCoords方法。它会遍历所有点集（条带）并遍历它们中的所有点，以选择搜索区域内的第一个点：

public void SelectPointAtCoords(Point MousePos, int XOffset, int YOffset)
{
    int i = 0;
    int j = 0;
    foreach (Strip strip in Strips)
    {
        i = 0;
        foreach (Point StripPoint in strip.Points)
        {
            if (MousePos.X + XOffset < StripPoint.X && MousePos.X + XOffset > StripPoint.X-5 && MousePos.Y + YOffset < StripPoint.Y && MousePos.Y + YOffset > StripPoint.Y - 5)
            {
                CurrentSelectedPointNumber = i + 1;
                CurrentSelectedStripNumber = j + 1;
                return;
            }
            i += 1;
        }
        j += 1;
    }
    CurrentSelectedPointNumber = 0;
    CurrentSelectedStripNumber = 0;
}

Draw方法。有点混乱，我仍然不了解图形对象与位图的关系，但至少它能起作用：

public Bitmap Draw(Bitmap InputBuffer)
{
    Bitmap MidBuffer = new Bitmap(InputBuffer);
    Graphics BufferGraphics = Graphics.FromImage(MidBuffer);
    BufferGraphics.Clear(Color.Transparent);
    int k = 0;
    int j = 0;
    MidBuffer.MakeTransparent();
    foreach (Strip CurrentStrip in Strips)
    {
        if (CurrentStrip != null)
        {
            if (CurrentStrip.HasPoints())
            {
                for (int i = 0; i <= CurrentStrip.AmountOfPoints; i++)
                {
                    if (i == CurrentSelectedPointNumber - 1)
                    {
                        BufferGraphics.DrawRectangle(System.Drawing.Pens.White, CurrentStrip.Points[i].X - 5, CurrentStrip.Points[i].Y - 5, 5, 5);
                        BufferGraphics.FillRectangle(System.Drawing.Brushes.Black, CurrentStrip.Points[i].X - 4, CurrentStrip.Points[i].Y - 4, 4, 4);
                        Console.WriteLine($"Drawing selected point at X:{CurrentStrip.Points[i].X} and Y:{CurrentStrip.Points[i].Y}");
                    }
                    else
                    {
                        BufferGraphics.DrawRectangle(System.Drawing.Pens.Black, CurrentStrip.Points[i].X - 5, CurrentStrip.Points[i].Y - 5, 5, 5);
                        BufferGraphics.FillRectangle(System.Drawing.Brushes.White, CurrentStrip.Points[i].X - 4, CurrentStrip.Points[i].Y - 4, 4, 4);
                        Console.WriteLine($"Drawing NOT selected point at X:{CurrentStrip.Points[i].X} and Y:{CurrentStrip.Points[i].Y}");
                    }
                }
            }
        }
        else
        {
            Console.WriteLine("Attempted to draw NULL strip");
        }
        k += 1;
    }
    //SecondBuffer = new Bitmap(SecondBuffer.Width, SecondBuffer.Height, BufferGraphics);
    //InputBuffer = InputBuffer + MidBuffer;
    return MidBuffer;
}

带有mousemove事件的慢速Picturebox更新

0 个答案: