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Python Script to rasterize / convert CAD DXF figures to PNG / JPG
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import dxfgrabber | |
import cv2 | |
import numpy as np | |
import sys | |
""" | |
def absdiff(num1, num2): | |
if num1 <= num2: | |
return num2 - num1 | |
else: | |
return num1 - num2 | |
""" | |
def getMinXY(shapes): | |
minX, minY = 99999, 99999 | |
for shape in shapes: | |
if shape.dxftype == 'LINE': | |
minX = min(minX, shape.start[0], shape.end[0]) | |
minY = min(minY, shape.start[1], shape.end[1]) | |
elif shape.dxftype == 'ARC': | |
minX = min(minX, shape.center[0]) | |
minY = min(minY, shape.center[1]) | |
return minX, minY | |
def getMaxXY(shapes): | |
maxX, maxY = -99999, -99999 | |
for shape in shapes: | |
if shape.dxftype == 'LINE': | |
maxX = max(maxX, shape.start[0], shape.end[0]) | |
maxY = max(maxY, shape.start[1], shape.end[1]) | |
elif shape.dxftype == 'ARC': | |
maxX = max(maxX, shape.center[0]) | |
maxY = max(maxY, shape.center[1]) | |
return maxX, maxY | |
#Translate x,y values as per fourth quadrant i.e positive x and negative y. Update y value to positive, to be used by opencv axes. | |
# shift origin of image by 100 pixels for better clarity of output image | |
def getXY(point): | |
x, y = point[0], point[1] | |
return int(x-minX+100), int(abs(y-maxY)+100) | |
dxf = dxfgrabber.readfile(sys.argv[1]) | |
shapes = dxf.entities.get_entities() | |
minX, minY = getMinXY(shapes) | |
maxX, maxY = getMaxXY(shapes) | |
#baseX, baseY = absdiff(minX, 0), absdiff(minY, 0) | |
#absMaxX, absMaxY = absdiff(maxX, 0), absdiff(maxY, 0) | |
print(maxX, maxY) | |
print(minX, minY) | |
#print(absMaxX, absMaxY) | |
#print(baseX, baseY) | |
canvas = np.zeros((512,512,3), np.uint8) | |
for shape in shapes: | |
if shape.dxftype == 'LINE': | |
x1, y1 = getXY(shape.start) | |
x2, y2 = getXY(shape.end) | |
canvas = cv2.line(canvas, (x1,y1), (x2,y2), (255, 0, 255), 1) | |
elif shape.dxftype == 'ARC': | |
centerX, centerY = getXY(shape.center) | |
if (shape.start_angle > 180) and (shape.end_angle < shape.start_angle): | |
canvas = cv2.ellipse(canvas, (centerX, centerY), (int(shape.radius), int(shape.radius)), 180, int(shape.start_angle) - 180, 180 + int(shape.end_angle), (0, 0, 255), 1) | |
else: | |
canvas = cv2.ellipse(canvas, (centerX, centerY), (int(shape.radius), int(shape.radius)), 0, int(360 - shape.start_angle), int(360 - shape.end_angle), (0, 0, 255), 1) | |
cv2.imshow('test', canvas) | |
cv2.waitKey(50) | |
# To save canvas use cv2.imwrite() | |
#cv2.imwrite('res.png', canvas) | |
cv2.waitKey(0) | |
cv2.destroyAllWindows() |
I run the script without any error, but the result is just null or black image.
Do you have any suggestion why?
Same, I'm guessing the dxfgrabber package got updated.
Need to scale x, y to fit into image!
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I run the script without any error, but the result is just null or black image.
Do you have any suggestion why?