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Answer 1

+1 A:

If you are drawing the text in an OnPaint() method, you can try this (reference):

Graphics g = e.Graphics;  // your graphics object.
float deg = 45F;  // an angle, this one is 45 degrees

g.RotateTransform(deg);
g.DrawString("slopey text is fun");

kbrimington 2010-08-07 05:44:06

Thanks, this seems to work. The only problem I have currently is that it rotates all the lines and stuff I draw too- though I think I can just create a new graphics object instead.

DMan 2010-08-07 14:55:59

You could probably un-rotate the text after drawing the string with `g.RotateTransform(-deg)`.

kbrimington 2010-08-07 17:06:53

That works, thanks. I multiplied by -1, but to the same effect as you posted.

DMan 2010-08-07 17:35:10

Answer 2

+1 A:

Use Math.Atan2() to calculate the angle. Convert from radians to degrees by multiplying by 180 / Math.Pi. Getting the center of rotation for RotateTransform() is the critical step to get the text aligned properly with the line. r * Math.Cos(angle) for the X-offset from the line start point, r * Sin(angle) for the Y-offset where r is the offset from the line start point. Adjust by the font's Height to get it above the line.

Hans Passant 2010-08-07 12:37:07

What does 'r' represent? Rotation?

DMan 2010-08-07 17:09:34

How far away from the line start point you draw the text.

Hans Passant 2010-08-07 17:11:51

I currently have ` e.Graphics.TranslateTransform(point.X, point.Y);` as the place for the start point. This seems to work without using Math.Cos/Sin, however, it is now under the line in some cases. What would you suggest I do to get it always above the line, no matter what angle I draw?

DMan 2010-08-07 17:43:24

I marked this as the best answer because it covers most of what I'm looking for. I found this order-of-magnitudes easier in WPF, so I decided to do that instead.

DMan 2010-08-07 23:13:52

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Aligning text on diagonal path

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