-
-
Save antiface/6fba25e98b292e7e45b565114149bcc8 to your computer and use it in GitHub Desktop.
Generates bitmap polygon from points
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| from PIL import Image | |
| from python.common import line as ln | |
| def polygon(points): | |
| # first lets convert the points to lines | |
| lines = [] | |
| xmax = 0 | |
| ymax = 0 | |
| points.append(points[0]) | |
| for p in range(1, len(points)): | |
| lines.append(ln.Line(points[p - 1][0], points[p - 1][1], points[p][0], points[p][1])) | |
| x = points[p - 1][0] | |
| y = points[p - 1][1] | |
| xmax = max(x, xmax) | |
| ymax = max(y, ymax) | |
| im = Image.new("RGB", (xmax + 1, ymax + 1), (255, 255, 255)) | |
| for x in range(xmax): | |
| for y in range(ymax): | |
| ypoint = y | |
| leftline = ln.Line(0, ypoint, x, ypoint) | |
| intersectioncount = 0 | |
| for line in lines: | |
| if ln.line_intersect(leftline, line) is not None: | |
| intersectioncount += 1 | |
| if intersectioncount % 2 != 0: | |
| im.putpixel((x, ypoint), (0, 0, 0)) | |
| im = im.rotate(180) | |
| im = im.transpose(Image.FLIP_LEFT_RIGHT) | |
| # im.save("polygon"+str(points)+".png") | |
| im.show() | |
| polygon([(10, 10), (180, 20), (160, 150), (100, 50), (20, 180)]) # Obr. 1 | |
| polygon([(10, 10), (180, 80), (160, 150), (130, 50), (20, 180)]) # Obr. 2 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment