The same scale on both axes

Let me describe my chart:
1. It has 4 units on X axis and 4 units on Y axis.
2. I can see that my chart is not a square - it is a rectangle (units on X axis are wider than units on Y axis).
3. I draw a line from (1, 1) to (3, 3) and definitely there is not 45 degree angle.

One more thing: size of my ZedGraph control is 600 : 400.

Still I have no clue what I am doing wrong.

Placek

Hi,
You can do this by adjusting the (for example) YAxis scale range to always maintain a 1:1 pixel aspect ratio. To do this, first make a SetSize() method that gets called in response to a ReSize event (like to example code). In your SetSize method, do this:

//fix the X scale, let the Y scale vary to pixel 1:1 aspect ratio
GraphPane pane = zedGraphControl1.GraphPane;
double xPixPerUnit = pane.AxisRect.Width / ( pane.XAxis.Scale.Max - pane.XAxis.Scale.Min );
pane.YAxis.Scale.Max = pane.AxisRect.Height / xPixPerUnit + pane.YAxis.Scale.Min;
pane.YAxis.Scale.MinAuto = false;
zedGraphControl1.AxisChange();

Be sure to call AxisChange() and then SetSize() when you first setup your graph.
John

Thanks John.

I tried your solution, but I does not work.

This is what I did:
1. In Form_Load I am creating my chart, which axes are of text type.
2. At the end of that method I have following lines:
zedGraphControl1.AxisChange();
SetSize(this, null);
3. My SetSize method is the following:
private void SetSize(object sender, EventArgs e)
{
//fix the X scale, let the Y scale vary to pixel 1:1 aspect ratio
GraphPane pane = zedGraphControl1.GraphPane;
double xPixPerUnit = pane.AxisRect.Width / (pane.XAxis.Scale.Max - pane.XAxis.Scale.Min);
pane.YAxis.Scale.Max = pane.AxisRect.Height / xPixPerUnit + pane.YAxis.Scale.Min;
pane.YAxis.Scale.MinAuto = false;
zedGraphControl1.AxisChange();
}
4. In response to ReSize event SetSize method is called.

I run my code and still unit on X axis is wider than unit on Y axis.

What am I missing?

Placek