解決C# WinForm Graphics繪制閃爍問題


不直接使用form的CreateGraphics創建Graphics進行繪制,可以先在Form上面放一個需要大小的PictureBox,再創建一個同大小的Bitmap,將這個Bitmap設置為PictureBox的Image。再在這個Bitmap上進行繪制,這樣拖動resize之類就不會閃爍了。

代碼片段:

PictureBox ImageBox = null;
Bitmap RenderTarget = null;

Size RenderSize = new Size();
public RenderForm()
        {
            InitializeComponent();

            ImageBox = new PictureBox();
            ImageBox.Size = Properties.Resources.background.Size;
            ImageBox.Parent = this;

            renderSize = new Size(StatTools.Properties.Resources.background.Width, StatTools.Properties.Resources.background.Height);
        }


public Size renderSize
        {
            get { return RenderSize; }
            set
            {
                if(RenderTarget == null || RenderTarget.Width != value.Width || RenderTarget.Height != value.Height)
                {
                    RenderTarget = null;
                    RenderTarget = new Bitmap(value.Width, value.Height);

                    ImageBox.Size = new Size(value.Width, value.Height);
                    ImageBox.Image = RenderTarget;
                }

                RenderSize = value;
            }
        }

private void RenderForm_Paint(object sender, PaintEventArgs e)
        {
            if( CurrentRender != null )
            {
                var GFX = Graphics.FromImage(RenderTarget);
                CurrentRender.OnDraw(GFX, renderSize.Width, renderSize.Height);
            }
        }

 


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