.FillRectangle不绘制任何东西 [英] .FillRectangle not drawing anything

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本文介绍了.FillRectangle不绘制任何东西的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述



此外,由于它没有任何例外,所以我跑出了一些想法,为什么它可能是,所以我在这里需要一些帮助:/ b / b>

受影响的代码部分是这个



<$ p $ (FileStream fileStream = File.OpenRead(filePath))
{
using(StreamReader streamReader = new StreamReader(fileStream,Encoding) .UTF8,true,1024))
{
String line;
int mW = Convert.ToInt32(Math.Round(this.Size.Width / 2d));
int mH = Convert.ToInt32(Math.Round(this.Size.Height / 2d));
SolidBrush myBrush;
myBrush = new SolidBrush(Color.Black);
PointF A = new PointF(0f,0f);
图形g = this.CreateGraphics();
g.TranslateTransform(mW,mH); ((line = streamReader.ReadLine())!= null)
{
string [] points = line.Split(',');
A = new PointF((float)(Convert.ToDecimal(points [0])),((float)(Convert.ToDecimal(points [1]))));
// A的定义是正确的,因为A.X和A.Y都有值
g.FillRectangle(myBrush,A.X,A.Y,1f,1f);



$ b catch(例外p)
{
MessageBox.Show(p.Message);
}

任何帮助都会超赞,因为我对Grpahics的知识是非常有限

在此先感谢,

Rubén:)

解决方案


好的,这有很大的帮助:D。

发表评论作为答案然后:



this.CreateGraphics 是可能的罪魁祸首。这将绘制到临时表面,当表单刷新时会被擦除。在Paint()事件中使用 e.Graphics ,或者使用 Graphics.FromImage()绘制位图显示。


I'm having trouble figuring out why .FillRectangle is not working for me.

Furthermore, as it's not thorwing any exception, I ran out of ideas why it could be, so I need some help here:/

The part of the code affected is this

try
{
    using (FileStream fileStream = File.OpenRead(filePath))
    {
        using (StreamReader streamReader = new StreamReader(fileStream, Encoding.UTF8, true, 1024))
        {
            String line;
            int mW = Convert.ToInt32(Math.Round(this.Size.Width / 2d));
            int mH = Convert.ToInt32(Math.Round(this.Size.Height / 2d));
            SolidBrush myBrush;
            myBrush = new SolidBrush(Color.Black);
            PointF A = new PointF(0f, 0f);
            Graphics g = this.CreateGraphics();
            g.TranslateTransform(mW, mH);
            while ((line = streamReader.ReadLine()) != null)
            {
                string[] points = line.Split(',');
                A = new PointF((float)(Convert.ToDecimal(points[0])), ((float)(Convert.ToDecimal(points[1]))));
                //A is defined correctly, as A.X and A.Y both have values
                g.FillRectangle(myBrush, A.X, A.Y, 1f, 1f);
            }
        }
    }
}
catch (Exception p)
{
    MessageBox.Show(p.Message);
}

Any help would be supper appreciated, as my knowledge about Grpahics is very limited

Thanks in advance,

Rubén :)

解决方案

Ok, that helped a lot :D. Thanks!

Posting comment as an Answer then:

this.CreateGraphics is the likely culprit. This draws to a temp surface that gets erased when the Form refreshes. Either use e.Graphics in the Paint() Event, or draw to a Bitmap with Graphics.FromImage() and display that.

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