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Add grid lines for circular build plates

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Some trigonometry is involved to find the correct lengths for the lines.

Contributes to issue CURA-4150.
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Ghostkeeper 2017-08-21 10:21:25 +02:00
parent d8dd9c0d3a
commit 3b93a9d309
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1 changed files with 21 additions and 2 deletions
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23
cura/BuildVolume.py
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@ -334,7 +334,7 @@ class BuildVolume(SceneNode):
mb.addArc(max_w, Vector.Unit_Y, center = (0, max_h, 0), color = self._volume_outline_color)
self.setMeshData(mb.build().getTransformed(scale_matrix))
# Build plate grid mesh
# Build plate surface.
mb = MeshBuilder()
mb.addVertex(0, min_h - z_fight_distance, 0)
mb.addArc(max_w, Vector.Unit_Y, center = Vector(0, min_h - z_fight_distance, 0))
@ -348,7 +348,26 @@ class BuildVolume(SceneNode):
for n in range(0, mb.getVertexCount()):
v = mb.getVertex(n)
mb.setVertexUVCoordinates(n, v[0], v[2] * aspect)
self._grid_mesh = mb.build().getTransformed(scale_matrix)
self._plate_mesh = mb.build().getTransformed(scale_matrix)
#Build plate grid mesh.
#We need to constrain the length of the lines to the build plate ellipsis. Time to get out the calculator!
mb = MeshBuilder()
for x in range(0, int(math.ceil(max_w)), MAJOR_GRID_SIZE):
#x / max_w is the fraction along the build plate we have progressed, counting from the centre.
#So x / max_w is sin(a), where a is the angle towards an endpoint of the grid line from the centre.
#So math.asin(x / max_w) is a.
#So math.cos(math.asin(x / max_w)) is half of the length of the grid line on a unit circle, which scales between 0 and 1.
length_factor = math.cos(math.asin(x / max_w))
mb.addLine(Vector(x, min_h, min_d * length_factor), Vector(x, min_h, max_d * length_factor), color = self._grid_color)
#Start from 0 in both cases, so you need to do this in two for loops.
mb.addLine(Vector(-x, min_h, min_d * length_factor), Vector(-x, min_h, max_d * length_factor), color = self._grid_color)
for y in range(0, int(math.ceil(max_d)), MAJOR_GRID_SIZE):
length_factor = math.sin(math.acos(y / max_d))
mb.addLine(Vector(min_w * length_factor, min_h, y), Vector(max_w * length_factor, min_h, y), color = self._grid_color)
mb.addLine(Vector(min_w * length_factor, min_h, -y), Vector(max_w * length_factor, min_h, -y), color = self._grid_color)
self._grid_mesh = mb.build()
# Indication of the machine origin
if self._global_container_stack.getProperty("machine_center_is_zero", "value"):