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line: add round cap

This commit is contained in:
Mathieu Virbel 2012-09-21 02:11:26 +02:00
parent 39c45abaf2
commit 21501651af
1 changed files with 70 additions and 0 deletions
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70
kivy/graphics/vertex_instructions_line.pxi
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@ -25,6 +25,7 @@ cdef class Line(VertexInstruction):
Width of the line, default 1.0
'''
cdef int _cap
cdef int _cap_precision
cdef int _joint
cdef list _points
cdef float _width
@ -40,6 +41,7 @@ cdef class Line(VertexInstruction):
self._width = kwargs.get('width') or 1.0
self.joint = kwargs.get('joint') or 'round'
self.cap = kwargs.get('cap') or 'round'
self._cap_precision = kwargs.get('cap_precision') or 20
cdef void build(self):
if self._width == 1.0:
@ -137,6 +139,9 @@ cdef class Line(VertexInstruction):
if self._cap == LINE_CAP_SQUARE:
indices_count += 12
vertices_count += 4
elif self._cap == LINE_CAP_ROUND:
indices_count += (self._cap_precision * 3) * 2
vertices_count += (self._cap_precision + 1) * 2
vertices = <vertex_t *>malloc(vertices_count * sizeof(vertex_t))
if vertices == NULL:
@ -299,6 +304,71 @@ cdef class Line(VertexInstruction):
ii += 6
iv += 2
elif self._cap == LINE_CAP_ROUND:
# cap start
a1 = sangle - PI2
a2 = sangle + PI2
step = (a1 - a2) / float(self._cap_precision)
siv = iv
cx = p[0]
cy = p[1]
vertices[iv].x = cx
vertices[iv].y = cy
vertices[iv].s0 = 0
vertices[iv].t0 = 0
iv += 1
for i in xrange(0, self._cap_precision - 1):
vertices[iv].x = cx + cos(a1 + step * i) * w
vertices[iv].y = cy + sin(a1 + step * i) * w
vertices[iv].s0 = 0
vertices[iv].t0 = 0
if i == 0:
indices[ii] = siv
indices[ii + 1] = 0
indices[ii + 2] = iv
else:
indices[ii] = siv
indices[ii + 1] = iv - 1
indices[ii + 2] = iv
iv += 1
ii += 3
indices[ii] = siv
indices[ii + 1] = iv - 1
indices[ii + 2] = 3
ii += 3
# cap end
a1 = angle - PI2
a2 = angle + PI2
step = (a2 - a1) / float(self._cap_precision)
siv = iv
cx = p[-2]
cy = p[-1]
vertices[iv].x = cx
vertices[iv].y = cy
vertices[iv].s0 = 0
vertices[iv].t0 = 0
iv += 1
for i in xrange(0, self._cap_precision - 1):
vertices[iv].x = cx + cos(a1 + step * i) * w
vertices[iv].y = cy + sin(a1 + step * i) * w
vertices[iv].s0 = 0
vertices[iv].t0 = 0
if i == 0:
indices[ii] = siv
indices[ii + 1] = piv + 1
indices[ii + 2] = iv
else:
indices[ii] = siv
indices[ii + 1] = iv - 1
indices[ii + 2] = iv
iv += 1
ii += 3
indices[ii] = siv
indices[ii + 1] = iv - 1
indices[ii + 2] = piv + 2
self.batch.set_data(vertices, vertices_count, indices, indices_count)
free(vertices)