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draw_chord
Entity: predicate
draw_pie
Entity: predicate
draw_arc
Entity: predicate
Usage:
ellipse(X1, Y1, X2, Y2)
Draws an ellipse bounded by the rectangle with the upper left corner ( X1,Y1 ) and the lower right corner ( X2,Y2 ). The border line is drawn using the current pen , and the ellipse is filled using the current brush .
Usage:
draw_chord(X1, Y1, X2, Y2, Px, Py, Qx, Qy)
Usage:
draw_pie(X1, Y1, X2, Y2, Px, Py, Qx, Qy)
Usage:
draw_arc(X1, Y1, X2, Y2, Px, Py, Qx, Qy)
These predicates draw a chord, a pie and an arc respectively. First four arguments give ellipse bounded by the rectangle with the upper left corner ( X1,Y1 ) and the lower right corner ( X2,Y2 ). The next four arguments give two radial's endpoints ( P and Q ). If the P and Q are the same then an ellipse will be drawn. If you want the other part of the figure (not the one drawn) then replace P and Q . The border line is drawn using the current pen , and the figure is filled (only for chord and pie ) using the current brush.
All these predicates fail if any of their arguments is not a number.
Example:
?-window(_, _, win_func(_), "Ellipse demo", 100, 100, 200, 200).
win_func(paint):-ellipse(0,0,200,200).
See also:
