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# -*- coding: utf-8 -*-
# Copradiusight (c) 2014, Vispy Development Team.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
"""Simple ellipse visual based on PolygonVisual"""
from __future__ import division
import numpy as np
from ..color import Color
from .polygon import PolygonVisual
class RectangleVisual(PolygonVisual):
"""
Displays a 2D rectangle with optional rounded corners
Parameters
----------
center : array
Center of the rectangle
color : instance of Color
The fill color to use.
border_color : instance of Color
The border color to use.
border_width : int
Border width in pixels.
Line widths > 1px are only
guaranteed to work when using `border_method='agg'` method.
height : float
Length of the rectangle along y-axis
Defaults to 1.0
width : float
Length of the rectangle along x-axis
Defaults to 1.0
radius : float | array
Radii of curvatures of corners in clockwise order from top-left
Defaults to 0.
**kwargs : dict
Keyword arguments to pass to `PolygonVisual`.
"""
def __init__(self, center=None, color='black', border_color=None,
border_width=1, height=1.0, width=1.0,
radius=[0., 0., 0., 0.], **kwargs):
self._height = height
self._width = width
self._color = Color(color)
self._border_color = Color(border_color)
self._border_width = border_width
self._radius = radius
self._center = center
# triangulation can be very slow
kwargs.setdefault('triangulate', False)
PolygonVisual.__init__(self, pos=None, color=color,
border_color=border_color,
border_width=border_width, **kwargs)
self._mesh.mode = 'triangle_fan'
self._regen_pos()
self._update()
@staticmethod
def _generate_vertices(center, radius, height, width):
half_height = height / 2.
half_width = width / 2.
hw = min(half_height, half_width)
if isinstance(radius, (list, tuple)):
if len(radius) != 4:
raise ValueError("radius must be float or 4 value tuple/list"
" (got %s of length %d)" % (type(radius),
len(radius)))
if (radius > np.ones(4) * hw).all():
raise ValueError('Radius of curvature cannot be greater than\
half of min(width, height)')
radius = np.array(radius, dtype=np.float32)
else:
if radius > hw:
raise ValueError('Radius of curvature cannot be greater than\
half of min(width, height)')
radius = np.ones(4) * radius
num_segments = (radius / hw * 500.).astype(int)
bias1 = np.ones(4) * half_width - radius
bias2 = np.ones(4) * half_height - radius
corner1 = np.empty([num_segments[0]+1, 3], dtype=np.float32)
corner2 = np.empty([num_segments[1]+1, 3], dtype=np.float32)
corner3 = np.empty([num_segments[2]+1, 3], dtype=np.float32)
corner4 = np.empty([num_segments[3]+1, 3], dtype=np.float32)
start_angle = 0.
end_angle = np.pi / 2.
theta = np.linspace(end_angle, start_angle, num_segments[0]+1)
corner1[:, 0] = center[0] - bias1[0] - radius[0] * np.sin(theta)
corner1[:, 1] = center[1] - bias2[0] - radius[0] * np.cos(theta)
corner1[:, 2] = 0
theta = np.linspace(start_angle, end_angle, num_segments[1]+1)
corner2[:, 0] = center[0] + bias1[1] + radius[1] * np.sin(theta)
corner2[:, 1] = center[1] - bias2[1] - radius[1] * np.cos(theta)
corner2[:, 2] = 0
theta = np.linspace(end_angle, start_angle, num_segments[2]+1)
corner3[:, 0] = center[0] + bias1[2] + radius[2] * np.sin(theta)
corner3[:, 1] = center[1] + bias2[2] + radius[2] * np.cos(theta)
corner3[:, 2] = 0
theta = np.linspace(start_angle, end_angle, num_segments[3]+1)
corner4[:, 0] = center[0] - bias1[3] - radius[3] * np.sin(theta)
corner4[:, 1] = center[1] + bias2[3] + radius[3] * np.cos(theta)
corner4[:, 2] = 0
output = np.concatenate(([[center[0], center[1], 0.]],
[[center[0] - half_width, center[1], 0.]],
corner1,
[[center[0], center[1] - half_height, 0.]],
corner2,
[[center[0] + half_width, center[1], 0.]],
corner3,
[[center[0], center[1] + half_height, 0.]],
corner4,
[[center[0] - half_width, center[1], 0.]]))
vertices = np.array(output, dtype=np.float32)
return vertices
@property
def center(self):
"""The center of the ellipse"""
return self._center
@center.setter
def center(self, center):
"""The center of the ellipse"""
self._center = center
self._regen_pos()
self._update()
@property
def height(self):
"""The height of the rectangle."""
return self._height
@height.setter
def height(self, height):
if height <= 0.:
raise ValueError('Height must be positive')
self._height = height
self._regen_pos()
self._update()
@property
def width(self):
"""The width of the rectangle."""
return self._width
@width.setter
def width(self, width):
if width <= 0.:
raise ValueError('Width must be positive')
self._width = width
self._regen_pos()
self._update()
@property
def radius(self):
"""The radius of curvature of rounded corners."""
return self._radius
@radius.setter
def radius(self, radius):
self._radius = radius
self._regen_pos()
self._update()
def _regen_pos(self):
vertices = self._generate_vertices(center=self._center,
radius=self._radius,
height=self._height,
width=self._width)
# don't use the center point and only use X/Y coordinates
vertices = vertices[1:, ..., :2]
self._pos = vertices
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