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Points lines and circles
Points line segments and arcs
4 other sections not shown
A*XJ algebra algorithm angle ax+by+c B*YJ calculated CDASH centre of gravity CFAC circle centre clipping coefficients components convex polygon coordinates corresponding cosines curve DENOM DENOM.LT.ACCY determinant DETINV direction ENDIF ENDIF ENDIF lf endpoints eye position FORTRAN function geometry graphics half-plane implicit equation implicit form intersection point lf the line line equation line segment linear simultaneous equations lines intersect LK LK matrix multiplied NEGX NEGY normal normalised form Octant parallel parameterisation parametric equations parametric form parametric line perpendicular perspective perspective projection Pixel Devices plane plot polygon problem quadratic radius rectangle ROOT.LT.-ACCY scalar product side solution square root straight line SUBROUTINE subtracted SWPXY tangent tetrahedron transformation triangle trigonometric functions University of Bath vector product vertex vertices whole circle XK YLK XLK*XLK XMAX XMIN XOLD XVAR YCONST YLK*YLK YVAR zero