Question

在移动或调整位图的大小时，我遇到了麻烦。我基本上是在做一个绘画类型的应用程序，该应用程序还将包含与photoshop相似的图层。

我已经设置了滚轮来缩放/调整位图的大小，并设置了鼠标中键来在按住面板并移动的同时移动面板。

我有一个面板，面板上的方格背景图像设置为平铺。这样可以使背景图案在调整大小时保持相同的大小。该面板主要用于设置位图的大小并具有背景。

以下是有关此问题的视频： numpy reference ceil

这是在不相关内容被删除的情况下进行绘制和移动的脚本。

 public Canvas()
    {
        InitializeComponent();
        this.SetStyle(ControlStyles.ResizeRedraw, true);
        this.MouseWheel += new MouseEventHandler(Canvas_WheelZoom);
        this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.DoubleBuffer | ControlStyles.SupportsTransparentBackColor, true);
        this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);

    }
 private void panel_DrawArea_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
        Graphics g;
        g = e.Graphics;
        //--------LAYERS--------//
        layerCount = layerBMPs.Count;
        if (layerCount > 0)
        {
            for (int i = 0; i < layerCount; i++)
            {
                Console.WriteLine("Draw Layer");
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
                g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
                g.DrawImage(layerBMPs[i], 0, 0, canvasSize.Width, canvasSize.Height);
            }
        }
        //--------LAYERS--------//

        //--------GRID--------//
        Console.WriteLine("Draw Grid");
        Bitmap gridArea;
        gridArea = new Bitmap(canvasSize.Width, canvasSize.Height);
        Pen myPen = new Pen(Brushes.Black);
        int tileCountX = canvasSize.Width / tileSize.Width;
        int tileCountY = canvasSize.Height / tileSize.Height;
        for (int i = 0; i < tileCountX; i++)
        {
            g.DrawLine(myPen, i * tileSize.Width * canvasScale, 0, i * tileSize.Width * canvasScale, canvasSize.Height);
        }
        for (int j = 0; j < tileCountY; j++)
        {
            g.DrawLine(myPen, 0, j * tileSize.Height * canvasScale, canvasSize.Width, j * tileSize.Height * canvasScale);
        }
        //--------GRID--------//
        g.Dispose();
        myPen.Dispose();
        }
    //Clicking the canvas
    private void panel_DrawArea_MouseDown(object sender, MouseEventArgs e)
    {
        //Detect which mouse button is pressed
        switch(MouseButtons)
        {
            case MouseButtons.Middle:
                //Move Canvas
                canvasMove = 1;
                canvasMoveX = e.X;
                canvasMoveY = e.Y;
                break;
        }
    }
    private void panel_DrawArea_MouseMove(object sender, MouseEventArgs e)
    {
        //Detect which mouse button is pressed
        switch (MouseButtons)
        {
            case MouseButtons.Middle:
                //Move Canvas
                if (canvasMove == 1)
                {
                    int xPos = Cursor.Position.X - canvasMoveX - this.Location.X;
                    int yPos = Cursor.Position.Y - canvasMoveY - this.Location.Y - 16;

                    drawAreaPos = new Point(xPos, yPos);

                    panel_DrawArea.Refresh(); <--- This makes it flicker really fast when moving or resizing.
                    //panel_DrawArea.Invalidate(); <--- Does nothing
                }

                break;
        }
    }
    private void panel_DrawArea_MouseUp(object sender, MouseEventArgs e)
    {
        switch (MouseButtons)
        {
            case MouseButtons.Middle:
                //Move Canvas
                canvasMove = 0;
                break;
        }
    }

所以基本上，这里发生的是列表包含位图。 draw事件中的循环绘制这些位图。一旦全部绘制完毕，然后将手柄绘制在顶部。

我已经尝试过两次缓冲并且无休止地尝试着，但是没有成功。

有人能帮忙吗？

谢谢

闪烁的C＃问题

0 个答案: