Graph Migration from c++ to c#

Ensoi

Hi,

Below is the code which is used for drawing a graph in the winforms using C++

Kindly let us know the correct conversion for drawing the same graph using C# in a picturebox

pDC->MoveTo(x,y+int(height*10/11));
pDC->LineTo(x+int(wid),y+int(height*10/11));

3 Replies

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Vulpes13y ago
That's because the upper left hand corner of the picturebox is considered to be the origin (0,0) for drawing purposes.

Points with negative co-ordinates will therefore be outside the picturebox.

You'll need to translate your co-ordinates so that they all fall within the positive xy quadrant in order to draw them within the picturebox.
Ensoi13y ago
Hi Thanks for your quick reply.

The idea worked out for positive values of x&y.

We have one more clarification i.e., if y is -ve the line is not getting plotted inside the picturebox.

Kindly let us know how to set the -ve value in picture box
Vulpes13y ago
It's difficult to translate these fragments in isolation but, as the C++ code appears to be drawing a vertical line 10/11ths of the way down from the origin, try this:

private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
int x = 0, y = 0; // say
int height = pictureBox1.Size.Height;
int wid = pictureBox1.Size.Width;

Point pt1 = new Point(x, y + (int)((float)height * 10 / 11));
Point pt2 = new Point(x + wid, y + (int)((float)height * 10 / 11));
e.Graphics.DrawLine(Pens.Black, pt1, pt2);
}