2 replies to this topic

[ChaosMaker]

There is some mathematical formula to check collision between two lines?
without using sprites or function collision_line native game maker.

[Gamer3D]

Non-vertical lines may be expressed in the form . Where (if the line passes through points <x1, y1> and <x2, y2>) and

If line 1 is and line 2 is , then because we want a point on both lines (x1 = x2, y1 = y2) we substitute to get: . Solving, we get . With x known, we now substitute that value back into one of the line equations to get y.

For vertical lines, substitute the x of the vertical line into the other line's equation.



Another more general way to do it is (without error-checking):

//  line_intersect (line1x1, line1y1, line1x2, line1y2, line2x1, line2y1, line2x2, line2y2);
argument2 -= argument0;
argument3 -= argument1;
argument6 -= argument4;
argument7 -= argument5;
var t;
t = (argument2 * (argument5 - argument1) + argument3 * (argument0 - argument4)) / (argument6 * argument3 - argument2 * argument7);
global.x = argument6 * t + argument4;
global.y = argument7 * t + argument5;

[ChaosMaker]

Thank you very much, works fine.
*.*