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line_intersects_line

By Daniel · January 12, 2009

Tests whether the line (NOT line segment) running from (x1, y1) to (x2, y2) intersects the line running from (x3, y3) to (x4, y4).

/* line_intersects_line(x1, y1, x2, y2, x3, y3, x4, y4)
 *
 * Tests whether the line (NOT line segment) running from (x1, y1) to
 * (x2, y2) intersects the line running from (x3, y3) to (x4, y4).
 *
 * The .13974 was added to prevent division by zero errors without having
 * to do extensive condition checking.
 */

return (argument0 - argument2) / (argument1 - argument3 + .13974)
    != (argument4 - argument6) / (argument5 - argument7 + .13974)
    || (argument0 - argument2) / (argument1 - argument3 + .13974)
    == (argument0 - argument4) / (argument1 - argument5 + .13974);

Categories: Geometry, Mathematics

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