Finding if a line intersects another.

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Giuseppe on 26 Mar 2014
Commented: Star Strider on 26 Mar 2014
I have the simultaneous solution of line 1 and line 2 for instance. This is a point where hey intersect. Say line one was between (1,2) to (2,3) how would i determine using if else end structure if this point lied along the line. NOTE It must not land on these end points (1,2) and (2,3).

Answers (1)

Image Analyst
Image Analyst on 26 Mar 2014
Basic algebra. You have the equations of 2 lines. They intersect at the same y value. So y1=m1*x+b1 = y2=m2*x+b2. So (m1-m2)*x = (b2-b1) and x = (b2-b1)/(m1-m2). Then you can check if that x is between 1 and 2 by plugging in the slope parameters m, and the intercept parameters b.

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