Finding if a line intersects another.

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Giuseppe
Giuseppe 2014-3-26
评论： Star Strider 2014-3-26
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).

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Image Analyst
Image Analyst 2014-3-26
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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