GetCursorPos
lazarus / 39-Graphics

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Middlecope · 2012-02-10 01:33

On a form I have a Paintbox.
On the Canvas of the Paintbox I draw an Ellipse(x1,y1,x2,y2)
If I click inside the ellipse in the PaintboxOnClick I state
GetCursorPos(p).
Unfortunately the  p.X and p.Y are outside the ranges [x1..x2] and
[y1..y2]
Does anyone has an idea what I do wrong?
Thanks for your attention
Teunis

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Leledumbo · 2012-02-10 02:12

AFAIK GetCursorPos returns cursor's global position (i.e. relative to
the screen, not your application nor the specific control). Try
calling ScreenToClient method from the specific control (TPaintBox in
your case).

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User137 · 2012-02-10 14:18

Alternatively you can declare variables mouseX, mouseY, and update
their values in PaintBoxOnMouseMove event, by X, Y parameters.

Or even easier by using onMouseDown (or onMouseUp) event instead of
onClick. You have those cursor coordinates passed as X, Y there too.