given a point and an angle, you can get another point at
(250+sin 0,2, 250+cos 0,2)
You can then find the intersection from the two pirs of points
http://mathworld.wolfram.c
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Question
Cross Point Of two lines
I have two lines
Line A is given a angle in radian
The other line(Line B) has been given two end point.
How do I know where Line A meets to line B when Line A it is extended towards to Line B.
For example
Line A
CPoint pt(250,250)
double ang = 0.2
Line B
CPoint sp(400,0), ep(400, 300)
I want to get a Point.
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Answers
ozo,
Isn't it the other way round?
(250,+cos0.2, 250+sin 0.2)
I guess cos is changes in x coor, and sin is changes in y coord
Do you have a piece of code finding intersections of two that line segment?
Link you gave me is seemed using matrix and i don't understand why is it so complicated formulars are involved
Thanks
The example above was that I just made up for better understanding of the problem.
So.... don't mind of the actual number.
What I want to have is the function that calculate the meeting point of two line segment.
angle would be radian
I examined if Line A would meet at some point with Line B by just looking at coordinates the line B.
Now, I want to have exact point of the meeting point so that I calculates the length of the Line A.
Let's define Line segment A as
double ang;
CPoint pt
and
Line Segment B as
CPoint ptStart;
CPoint ptEnd;
Code would looks like
CrossPointOfSeg(pt, ang, ptStart, ptEnd, ptCross)
so that ptCross
Thanks
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by: trinitrotoluenePosted on 2009-11-02 at 17:24:14ID: 25725427
since you have the slope of line A it should be possible to get the angle which it makes with the X axis
0.2 = tan(angle)
once you know the angle you can get the equation for the line using the following relation
y = m(x) + c
after that it is pretty obvious whether the 2 lines intersect or not. You can just plot them and see whether they intersect.