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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2019 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ############################################################################*/
"""
This module provides a class to render a set of 2D triangles
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "03/04/2017"
import ctypes
import numpy
from .....math.combo import min_max
from .... import _glutils as glutils
from ...._glutils import gl
class GLPlotTriangles(object):
"""Handle rendering of a set of colored triangles"""
_PROGRAM = glutils.Program(
vertexShader="""
#version 120
uniform mat4 matrix;
attribute float xPos;
attribute float yPos;
attribute vec4 color;
varying vec4 vColor;
void main(void) {
gl_Position = matrix * vec4(xPos, yPos, 0.0, 1.0);
vColor = color;
}
""",
fragmentShader="""
#version 120
uniform float alpha;
varying vec4 vColor;
void main(void) {
gl_FragColor = vColor;
gl_FragColor.a *= alpha;
}
""",
attrib0='xPos')
def __init__(self, x, y, color, triangles, alpha=1.):
"""
:param numpy.ndarray x: X coordinates of triangle corners
:param numpy.ndarray y: Y coordinates of triangle corners
:param numpy.ndarray color: color for each point
:param numpy.ndarray triangles: (N, 3) array of indices of triangles
:param float alpha: Opacity in [0, 1]
"""
# Check and convert input data
x = numpy.ravel(numpy.array(x, dtype=numpy.float32))
y = numpy.ravel(numpy.array(y, dtype=numpy.float32))
color = numpy.array(color, copy=False)
# Cast to uint32
triangles = numpy.array(triangles, copy=False, dtype=numpy.uint32)
assert x.size == y.size
assert x.size == len(color)
assert color.ndim == 2 and color.shape[1] in (3, 4)
if numpy.issubdtype(color.dtype, numpy.floating):
color = numpy.array(color, dtype=numpy.float32, copy=False)
elif numpy.issubdtype(color.dtype, numpy.integer):
color = numpy.array(color, dtype=numpy.uint8, copy=False)
else:
raise ValueError('Unsupported color type')
assert triangles.ndim == 2 and triangles.shape[1] == 3
self.__x_y_color = x, y, color
self.xMin, self.xMax = min_max(x, finite=True)
self.yMin, self.yMax = min_max(y, finite=True)
self.__triangles = triangles
self.__alpha = numpy.clip(float(alpha), 0., 1.)
self.__vbos = None
self.__indicesVbo = None
self.__picking_triangles = None
def pick(self, x, y):
"""Perform picking
:param float x: X coordinates in plot data frame
:param float y: Y coordinates in plot data frame
:return: List of picked data point indices
:rtype: numpy.ndarray
"""
if (x < self.xMin or x > self.xMax or
y < self.yMin or y > self.yMax):
return ()
xPts, yPts = self.__x_y_color[:2]
if self.__picking_triangles is None:
self.__picking_triangles = numpy.zeros(
self.__triangles.shape + (3,), dtype=numpy.float32)
self.__picking_triangles[:, :, 0] = xPts[self.__triangles]
self.__picking_triangles[:, :, 1] = yPts[self.__triangles]
segment = numpy.array(((x, y, -1), (x, y, 1)), dtype=numpy.float32)
# Picked triangle indices
indices = glutils.segmentTrianglesIntersection(
segment, self.__picking_triangles)[0]
# Point indices
indices = numpy.unique(numpy.ravel(self.__triangles[indices]))
# Sorted from furthest to closest point
dists = (xPts[indices] - x) ** 2 + (yPts[indices] - y) ** 2
indices = indices[numpy.flip(numpy.argsort(dists))]
return tuple(indices)
def discard(self):
"""Release resources on the GPU"""
if self.__vbos is not None:
self.__vbos[0].vbo.discard()
self.__vbos = None
self.__indicesVbo.discard()
self.__indicesVbo = None
def prepare(self):
"""Allocate resources on the GPU"""
if self.__vbos is None:
self.__vbos = glutils.vertexBuffer(self.__x_y_color)
# Normalization is need for color
self.__vbos[-1].normalization = True
if self.__indicesVbo is None:
self.__indicesVbo = glutils.VertexBuffer(
numpy.ravel(self.__triangles),
usage=gl.GL_STATIC_DRAW,
target=gl.GL_ELEMENT_ARRAY_BUFFER)
def render(self, matrix, isXLog, isYLog):
"""Perform rendering
:param numpy.ndarray matrix: 4x4 transform matrix to use
:param bool isXLog:
:param bool isYLog:
"""
self.prepare()
if self.__vbos is None or self.__indicesVbo is None:
return # Nothing to display
self._PROGRAM.use()
gl.glUniformMatrix4fv(self._PROGRAM.uniforms['matrix'],
1,
gl.GL_TRUE,
matrix.astype(numpy.float32))
gl.glUniform1f(self._PROGRAM.uniforms['alpha'], self.__alpha)
for index, name in enumerate(('xPos', 'yPos', 'color')):
attr = self._PROGRAM.attributes[name]
gl.glEnableVertexAttribArray(attr)
self.__vbos[index].setVertexAttrib(attr)
with self.__indicesVbo:
gl.glDrawElements(gl.GL_TRIANGLES,
self.__triangles.size,
glutils.numpyToGLType(self.__triangles.dtype),
ctypes.c_void_p(0))
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