Graphic primitives

Files
file	animscenes.c
	generates intermediate scenes by interpolation
file	curve2spline.c
	converts a discrete open curve into a spline
file	drawball.c
	generates a binary euclidean ball
file	drawcurve.c
	draw line segments which are specified by a text file
file	drawellipse.c
	Draws an ellipse.
file	drawfield.c
	draw line segments that represent a vector field
file	drawfieldlists.c
	draw line segments that represent a vector field (represented by two lists)
file	drawline.c
	draw a graph in a 2D image
file	drawline.c
	draw a graph in a 2D image
file	drawlines.c
	draw line segments which are specified by a text file
file	drawrect.c
	Draws a rectangle with sides parallel to the main axes.
file	drawscene.c
	draw a 3D scene which is specified by a text file into a 3D pgm image
file	drawspline.c
	draw a spline which is specified by its control points
file	drawsplineorient.c
	draw spline orientations in a vector field
file	drawsplines.c
	draw spline segments which are specified by a text file
file	drawsplinesorient.c
	draw spline orientations in a vector field (multiple spline version)
file	drawtorus.c
	generates a binary torus
file	drawtriangulation.c
	draw a triangulation
file	genball.c
	generates a binary euclidean ball
file	line.c
	Draws a straight line between the two first points found in image.
file	points2spline.c
	converts a sequence of control points into a spline
file	samplespline.c
	samples a cubic spline according to its curvilinear abcissa