Determining the new faces (subpolygons) when vertical lines intersect polygon

2014 3 22
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更新时间：2014 3 23
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Hi everyone,
If a polygon is inside a rectangle, and a set of vertical parallel lines where each of them pass through one vertex creating new faces.
Is there algorithm to determining the points of the new faces, when a vertical parallel lines cut polygon that lies inside rectangle?

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Image Analyst
Image Analyst 2014-3-22

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If you want to do it numerically, sure. Just turn it into an array (an image) and use find() to find the intersections in each column. If you want to do it analytically, then it seems to be a theoretical math or geometry problem - not sure it's a MATLAB problem.

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Image Analyst
Image Analyst 2014-3-22
By the way, hash tags are not used in Answers. Spaces will connect all your tags into one big long tag. Use commas to separate tags. You might want to fix your tags.
Sososasa
Sososasa 2014-3-22
Is there a way to get the color of each pixel( which is for my problem each vertex)? I don't want to save the figure then turn it to a matrix because I will lose the coordinates right ?
Image Analyst
Image Analyst 2014-3-22
Assuming you plotted it with patch() or fill() or something like that then you have the coordinates of the polygon you plotted. You can use inpolygon() to determine if a point is inside or outside the polygon. The colors there can be determined. The color right exactly on the infinitesimally thin boundary is, of course, indeterminate.
Sososasa
Sososasa 2014-3-23
Thank you so much. and I want to ask is it possible to blind color in matlab? I mean if I have a rectangle in yellow color, and a circle in read, and they are intersect, is there a function or way to make the intersection to orange?
Image Analyst
Image Analyst 2014-3-23
No, not unless you make it an image - a true color RGB image with pixels.

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