[英].FillRectangle not drawing anything
I'm having trouble figuring out why .FillRectangle is not working for me.我无法弄清楚为什么 .FillRectangle 对我不起作用。
Furthermore, as it's not thorwing any exception, I ran out of ideas why it could be, so I need some help here:/此外,由于它没有抛出任何异常,我想不出为什么会这样,所以我需要一些帮助:/
The part of the code affected is this受影响的代码部分是这样的
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任何帮助将不胜感激,因为我对 Grpahics 的了解非常有限
Thanks in advance,提前致谢,
Rubén :)鲁本 :)
Ok, that helped a lot :D.
好的,这很有帮助:D。 Thanks!
谢谢!
Posting comment as an Answer then:发表评论作为答案然后:
this.CreateGraphics
is the likely culprit. this.CreateGraphics
可能是罪魁祸首。 This draws to a temp surface that gets erased when the Form refreshes.这将绘制到一个临时表面,当表单刷新时该表面会被擦除。 Either use
e.Graphics
in the Paint() Event, or draw to a Bitmap with Graphics.FromImage()
and display that.在 Paint() 事件中使用
e.Graphics
,或者使用Graphics.FromImage()
绘制到位图并显示它。
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