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Circle Segment

rvaken
rvaken asked
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Last Modified: 2010-04-04
I have a drawn a circle and i want to draw a line from the middlepoint of the circle given the angle to the end of the circle (like a speedmeter). I use the following formula but can't get it working...Ellipse(0, 0, Radius, Radius);X := round(cos(PI * Angle / 180) * Radius / 2);Y := round(sin(PI * Angle / 180) * Radius / 2);MoveTo( round(Radius / 2), round(Radius / 2));LineTo( X, Y);with regards, Ronald
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You must change calculate for X and Y.

X := round(cos(PI * Angle / 180) * Radius / 2 + Radius/2);
Y := round(sin(PI * Angle / 180) * Radius / 2+ Radius/2);

This is because Ellipse( x1,y1,x2,y2 ) draw ellipse bounded on rectangle. (not Ellipse( x1,y1,r1,r2) !!! );


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Commented:
Thanks, mirek... I lost the clue's... Couldn't see the prob anymore... :)
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