generate image for stroke width 2.0 and 3.0 on Python (pgmagick)

gen_polyline.py

import pgmagick as pg


def gen_line_png(line_width):
    img = pg.Image(pg.Geometry(200, 200), "white")
    img.type(pg.ImageType.TrueColorMatteType)
    coords = pg.CoordinateList()
    drawables = pg.DrawableList()

    blankColor = pg.Color()
    ptColor = pg.Color("magenta")
    lineColor = pg.Color("red")
    drawables.push_back(pg.DrawableFillColor(ptColor))
    drawables.push_back(pg.DrawableStrokeColor(ptColor))
    for x, y in [(50, 50), (75, 60), (100, 80), (150, 150), (150, 30), (180, 10)]:
        coords.push_back(pg.Coordinate(x, img.size().height() - y))
        r = 1.0
        y = img.size().height() - y
        drawables.push_back(pg.DrawableCircle(x, y, x + r, y + r))

    drawables.push_back(pg.DrawableFillColor(blankColor))
    drawables.push_back(pg.DrawableStrokeColor(lineColor))
    drawables.push_back(pg.DrawableStrokeLineJoin(pg.LineJoin.RoundJoin))
    drawables.push_back(pg.DrawableStrokeWidth(line_width))
    drawables.push_back(pg.DrawablePolyline(coords))
    img.draw(drawables)
    img.write('test%d.png' % int(line_width))


for w in (1.0, 2.0, 3.0, 4.0, 5.0, 10.0):
    gen_line_png(w)