DrawingAlgos.py

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import FreeCAD, Part, Drawing

startSVG = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 
<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ev="http://www.w3.org/2001/xml-events"
     version="1.1" baseProfile="full"
     width="297mm" height="420mm">
"""


def createSVG(Part):

        # projecting with HLR
        [Visibly,Hidden] = Drawing.project(Part)
        buffer = startSVG

        for i in Hidden.Edges:
                buffer += '<line x1="' +`i.Vertexes[0].X` +'" y1="' +`i.Vertexes[0].Y` +'" x2="'+ `i.Vertexes[1].X`+ '" y2="'+ `i.Vertexes[1].Y`+ '" stroke="#fff000" stroke-width="1px" />\n'
        for i in Visibly.Edges:
                buffer += '<line x1="' +`i.Vertexes[0].X` +'" y1="' +`i.Vertexes[0].Y` +'" x2="'+ `i.Vertexes[1].X`+ '" y2="'+ `i.Vertexes[1].Y`+ '" stroke="#000000" stroke-width="1px" />\n'
                
        buffer += '</svg>'

        return buffer