From 0348b03b91f64c43c5d0adba2f41d0ef21a82c9a Mon Sep 17 00:00:00 2001 From: Lex Neva Date: Wed, 30 May 2018 20:10:11 -0400 Subject: add realistic boolean param to render_stitch_plan() --- lib/svg/realistic_rendering.py | 129 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 lib/svg/realistic_rendering.py (limited to 'lib/svg/realistic_rendering.py') diff --git a/lib/svg/realistic_rendering.py b/lib/svg/realistic_rendering.py new file mode 100644 index 00000000..e31534da --- /dev/null +++ b/lib/svg/realistic_rendering.py @@ -0,0 +1,129 @@ +import simplepath +import math + +from .units import PIXELS_PER_MM +from ..utils import cache, Point + +# The stitch vector path looks like this: +# _______ +# (_______) +# +# It's 0.32mm high, which is the approximate thickness of common machine +# embroidery threads. + +# 1.216 pixels = 0.32mm +stitch_height = 1.216 + +# This vector path starts at the upper right corner of the stitch shape and +# proceeds counter-clockwise.and contains a placeholder (%s) for the stitch +# length. +# +# It contains two invisible "whiskers" of zero width that go above and below +# to ensure that the SVG renderer allocates a large enough canvas area when +# computing the gaussian blur steps. Otherwise, we'd have to expand the +# width and height attributes of the tag to add more buffer space. +# The width and height are specified in multiples of the bounding box +# size, It's the bounding box aligned with the global SVG canvas's axes, not +# the axes of the stitch itself. That means that having a big enough value +# to add enough padding on the long sides of the stitch would waste a ton +# of space on the short sides and significantly slow down rendering. +stitch_path = "M0,0c0.4,0,0.4,0.3,0.4,0.6c0,0.3,-0.1,0.6,-0.4,0.6v0.2,-0.2h-%sc-0.4,0,-0.4,-0.3,-0.4,-0.6c0,-0.3,0.1,-0.6,0.4,-0.6v-0.2,0.2z" + +# This filter makes the above stitch path look like a real stitch with lighting. +realistic_filter = """ + + + + + + + + + + + + + + + + + + +""" + +def realistic_stitch(start, end): + """Generate a stitch vector path given a start and end point.""" + + end = Point(*end) + start = Point(*start) + + stitch_length = (end - start).length() + stitch_center = (end + start) / 2.0 + stitch_direction = (end - start) + stitch_angle = math.atan2(stitch_direction.y, stitch_direction.x) + + stitch_length = max(0, stitch_length - 0.2 * PIXELS_PER_MM) + + # create the path by filling in the length in the template + path = simplepath.parsePath(stitch_path % stitch_length) + + # rotate the path to match the stitch + rotation_center_x = -stitch_length / 2.0 + rotation_center_y = stitch_height / 2.0 + simplepath.rotatePath(path, stitch_angle, cx=rotation_center_x, cy=rotation_center_y) + + # move the path to the location of the stitch + simplepath.translatePath(path, stitch_center.x - rotation_center_x, stitch_center.y - rotation_center_y) + + return simplepath.formatPath(path) -- cgit v1.2.3