mirror of https://github.com/kivy/kivy.git
line: add the line pxi
This commit is contained in:
Mathieu Virbel
parent
2ea2f52308
commit
0b256b418b
|
|
@ -0,0 +1,232 @@
|
|||
DEF LINE_CAP_NONE = 0
|
||||
DEF LINE_CAP_SQUARE = 1
|
||||
DEF LINE_CAP_ROUND = 2
|
||||
|
||||
DEF LINE_JOINT_NONE = 0
|
||||
DEF LINE_JOINT_MITER = 1
|
||||
DEF LINE_JOINT_BEVEL = 2
|
||||
DEF LINE_JOINT_ROUND = 3
|
||||
|
||||
cdef class Line(VertexInstruction):
|
||||
'''A 2d line.
|
||||
|
||||
.. versionadded:: 1.0.8
|
||||
`dash_offset` and `dash_length` have been added
|
||||
|
||||
:Parameters:
|
||||
`points`: list
|
||||
List of points in the format (x1, y1, x2, y2...)
|
||||
`dash_length`: int
|
||||
Length of a segment (if dashed), default 1
|
||||
`dash_offset`: int
|
||||
Offset between the end of a segments and the begining of the
|
||||
next one, default 0, changing this makes it dashed.
|
||||
`width`: float
|
||||
Width of the line, default 1.0
|
||||
'''
|
||||
cdef int _cap
|
||||
cdef int _joint
|
||||
cdef list _points
|
||||
cdef float _width
|
||||
cdef int _dash_offset, _dash_length
|
||||
|
||||
def __init__(self, **kwargs):
|
||||
VertexInstruction.__init__(self, **kwargs)
|
||||
v = kwargs.get('points')
|
||||
self.points = v if v is not None else []
|
||||
self.batch.set_mode('line_strip')
|
||||
self._dash_length = kwargs.get('dash_length') or 1
|
||||
self._dash_offset = kwargs.get('dash_offset') or 0
|
||||
self._width = kwargs.get('width') or 1.0
|
||||
self.joint = kwargs.get('joint') or 'round'
|
||||
self.cap = kwargs.get('cap') or 'round'
|
||||
|
||||
cdef void build(self):
|
||||
if self._width == 1.0:
|
||||
self.build_legacy()
|
||||
else:
|
||||
self.build_extended()
|
||||
|
||||
cdef void build_legacy(self):
|
||||
cdef int i, count = len(self.points) / 2
|
||||
cdef list p = self.points
|
||||
cdef vertex_t *vertices = NULL
|
||||
cdef unsigned short *indices = NULL
|
||||
cdef float tex_x
|
||||
cdef char *buf = NULL
|
||||
cdef Texture texture = self.texture
|
||||
|
||||
if count < 2:
|
||||
self.batch.clear_data()
|
||||
return
|
||||
|
||||
if self._dash_offset != 0:
|
||||
if texture is None or texture._width != \
|
||||
(self._dash_length + self._dash_offset) or \
|
||||
texture._height != 1:
|
||||
|
||||
self.texture = texture = Texture.create(
|
||||
size=(self._dash_length + self._dash_offset, 1))
|
||||
texture.wrap = 'repeat'
|
||||
|
||||
# create a buffer to fill our texture
|
||||
buf = <char *>malloc(4 * (self._dash_length + self._dash_offset))
|
||||
memset(buf, 255, self._dash_length * 4)
|
||||
memset(buf + self._dash_length * 4, 0, self._dash_offset * 4)
|
||||
p_str = PyString_FromStringAndSize(buf, (self._dash_length + self._dash_offset) * 4)
|
||||
|
||||
self.texture.blit_buffer(p_str, colorfmt='rgba', bufferfmt='ubyte')
|
||||
free(buf)
|
||||
|
||||
elif texture is not None:
|
||||
self.texture = None
|
||||
|
||||
vertices = <vertex_t *>malloc(count * sizeof(vertex_t))
|
||||
if vertices == NULL:
|
||||
raise MemoryError('vertices')
|
||||
|
||||
indices = <unsigned short *>malloc(count * sizeof(unsigned short))
|
||||
if indices == NULL:
|
||||
free(vertices)
|
||||
raise MemoryError('indices')
|
||||
|
||||
tex_x = 0
|
||||
for i in xrange(count):
|
||||
if self._dash_offset != 0 and i > 0:
|
||||
tex_x += sqrt(
|
||||
pow(p[i * 2] - p[(i - 1) * 2], 2) +
|
||||
pow(p[i * 2 + 1] - p[(i - 1) * 2 + 1], 2)) / (
|
||||
self._dash_length + self._dash_offset)
|
||||
|
||||
vertices[i].s0 = tex_x
|
||||
vertices[i].t0 = 0
|
||||
|
||||
vertices[i].x = p[i * 2]
|
||||
vertices[i].y = p[i * 2 + 1]
|
||||
indices[i] = i
|
||||
|
||||
self.batch.set_data(vertices, count, indices, count)
|
||||
|
||||
free(vertices)
|
||||
free(indices)
|
||||
|
||||
cdef void build_extended(self):
|
||||
# TODO: current implementation doesn't support alpha well.
|
||||
cdef int i, count = len(self.points) / 2
|
||||
cdef list p = self.points
|
||||
cdef vertex_t *vertices = NULL
|
||||
cdef unsigned short *indices = NULL
|
||||
cdef float tex_x
|
||||
cdef char *buf = NULL
|
||||
cdef Texture texture = self.texture
|
||||
|
||||
|
||||
|
||||
property points:
|
||||
'''Property for getting/settings points of the line
|
||||
|
||||
.. warning::
|
||||
|
||||
This will always reconstruct the whole graphics from the new points
|
||||
list. It can be very CPU expensive.
|
||||
'''
|
||||
def __get__(self):
|
||||
return self._points
|
||||
def __set__(self, points):
|
||||
self._points = list(points)
|
||||
self.flag_update()
|
||||
|
||||
property dash_length:
|
||||
'''Property for getting/setting the length of the dashes in the curve
|
||||
|
||||
.. versionadded:: 1.0.8
|
||||
'''
|
||||
def __get__(self):
|
||||
return self._dash_length
|
||||
|
||||
def __set__(self, value):
|
||||
if value < 0:
|
||||
raise GraphicException('Invalid dash_length value, must be >= 0')
|
||||
self._dash_length = value
|
||||
self.flag_update()
|
||||
|
||||
property dash_offset:
|
||||
'''Property for getting/setting the offset between the dashes in the curve
|
||||
|
||||
.. versionadded:: 1.0.8
|
||||
'''
|
||||
def __get__(self):
|
||||
return self._dash_offset
|
||||
|
||||
def __set__(self, value):
|
||||
if value < 0:
|
||||
raise GraphicException('Invalid dash_offset value, must be >= 0')
|
||||
self._dash_offset = value
|
||||
self.flag_update()
|
||||
|
||||
property width:
|
||||
'''Determine the width of the line, default to 1.0.
|
||||
|
||||
.. versionadded:: 1.4.1
|
||||
'''
|
||||
def __get__(self):
|
||||
return self._width
|
||||
|
||||
def __set__(self, value):
|
||||
if value <= 0:
|
||||
raise GraphicException('Invalid width value, must be > 0')
|
||||
self._width = value
|
||||
self.flag_update()
|
||||
|
||||
property cap:
|
||||
'''Determine the cap of the line, default to "round"
|
||||
|
||||
.. versionadded:: 1.4.1
|
||||
'''
|
||||
def __get__(self):
|
||||
if self._cap == LINE_CAP_SQUARE:
|
||||
return 'square'
|
||||
elif self._cap == LINE_CAP_ROUND:
|
||||
return 'round'
|
||||
return None
|
||||
|
||||
def __set__(self, value):
|
||||
if value not in (None, 'square', 'round'):
|
||||
raise GraphicException('Invalid cap, must be one of '
|
||||
'None, "square", "round"')
|
||||
if value == 'square':
|
||||
self._cap = LINE_CAP_SQUARE
|
||||
elif value == 'round':
|
||||
self._cap = LINE_CAP_ROUND
|
||||
else:
|
||||
self._cap = LINE_CAP_NONE
|
||||
self.flag_update()
|
||||
|
||||
property joint:
|
||||
'''Determine the join of the line, default to "round"
|
||||
|
||||
.. versionadded:: 1.4.1
|
||||
'''
|
||||
|
||||
def __get__(self):
|
||||
if self._joint == LINE_JOINT_ROUND:
|
||||
return 'round'
|
||||
elif self._joint == LINE_JOINT_BEVEL:
|
||||
return 'bevel'
|
||||
elif self._joint == LINE_JOINT_MITER:
|
||||
return 'miter'
|
||||
return None
|
||||
|
||||
def __set__(self, value):
|
||||
if value not in (None, 'miter', 'bevel', 'round'):
|
||||
raise GraphicException('Invalid joint, must be one of '
|
||||
'None, "miter", "bevel", "round"')
|
||||
if value == 'round':
|
||||
self._joint = LINE_JOINT_ROUND
|
||||
elif value == 'bevel':
|
||||
self._joint = LINE_JOINT_BEVEL
|
||||
elif value == 'miter':
|
||||
self._joint = LINE_JOINT_MITER
|
||||
else:
|
||||
self._joint = LINE_JOINT_NONE
|
||||
self.flag_update()
|
||||
Loading…
Reference in New Issue