Source code for opengl.sanitize

#
##
##  This file is part of pyFormex 2.5  (Wed Mar 24 20:37:37 CET 2021)
##  pyFormex is a tool for generating, manipulating and transforming 3D
##  geometrical models by sequences of mathematical operations.
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"""Sanitize data before rendering.

The pyFormex drawing functions were designed to require a minimal knowledge
of OpenGL and rendering principles in general. They allow the user to specify
rendering attributes in a simple, user-friendly, sometimes even sloppy way.
This module contains some functions to sanitize the user input into the more
strict attributes required by the OpenGl rendering engine.

These functions are generally not intended for direct used by the user, but
for use in the opengl rendering functions.
"""

import pyformex as pf
from pyformex import colors
import pyformex.arraytools as at
import numpy as np


### Sanitize settings ###############################################

[docs]def saneFloat(value): """Return a float value or None. If value can be converted to float, the float is returned, else None. """ try: value = float(value) except Exception: value = None return value
saneLineWidth = saneFloat
[docs]def saneLineStipple(stipple): """Return a sane line stipple tuple. A line stipple tuple is a tuple (factor,pattern) where pattern defines which pixels are on or off (maximum 16 bits), factor is a multiplier for each bit. """ try: stipple = [int(i) for i in stipple] except Exception: stipple = None return stipple
[docs]def saneColor(color=None): """Return a sane color array derived from the input color. A sane color is one that will be usable by the draw method. The input value of color can be either of the following: - None: indicates that the default color will be used, - a single color value in a format accepted by colors.GLcolor, - a tuple or list of such colors, - a (3,) shaped array of RGB values, ranging from 0.0 to 1.0, - an (n,3) shaped array of RGB values, - a (4,) shaped array of RGBA values, ranging from 0.0 to 1.0, - an (n,4) shaped array of RGBA values, - an (n,) shaped array of integer color indices. The return value is one of the following: - None, indicating no color (current color will be used), - a float array with shape (3/4,), indicating a single color, - a float array with shape (n,3/4), holding a collection of colors, - an integer array with shape (n,), holding color index values. !! Note that a single color can not be specified as integer RGB values. A single list of integers will be interpreted as a color index ! Turning the single color into a list with one item will work though. [[ 0, 0, 255 ]] will be the same as [ 'blue' ], while [ 0,0,255 ] would be a color index with 3 values. Examples -------- >>> print(saneColor('red')) [ 1. 0. 0.] >>> print(saneColor('grey90')) [ 0.9 0.9 0.9] >>> saneColor(['red', 'green', 'blue']) array([[ 1., 0., 0.], [ 0., 1., 0.], [ 0., 0., 1.]]) >>> saneColor([['red', 'green', 'blue'], ['cyan', 'magenta', 'yellow']]) array([[[ 1., 0., 0.], [ 0., 1., 0.], [ 0., 0., 1.]], [[ 0., 1., 1.], [ 1., 0., 1.], [ 1., 1., 0.]]]) """ if color is None: # no color: use canvas color return None color = np.asarray(color) if color.dtype.kind == 'i': # We have a color index: convert to int32 return color.astype(np.int32) if color.dtype.kind != 'f': # Convert to colors try: color = at.mapArray(colors.GLcolor, color) except Exception: print("Could not convert input to colors:") print(color) return None if color.shape[-1] == 3 or color.shape[-1] == 4: # Looks like we have a sane color array return color.astype(np.float32) print(f"Invalid color array shape: color.shape") return None
[docs]def saneColorSet(color=None, colormap=None, shape=(1,)): """Return a sane set of colors. A sane set of colors is one that guarantees correct use by the draw functions. This means either - no color (None) - a single color - at least as many colors as the shape argument specifies - a color index and a color map with enough colors to satisfy the index. The return value is a tuple color,colormap. colormap will be None, unless color is an integer array, meaning a color index. """ if at.isInt(shape): # make sure we get a tuple shape = (shape,) color = saneColor(color) if color is not None: pf.debug(f"SANECOLORSET: color {color.shape}, shape {shape}", pf.DEBUG.DRAW) if color.dtype.kind == 'i': ncolors = color.max()+1 #print(f"ncolors: {ncolors}") if colormap is None: colormap = pf.canvas.settings.colormap colormap = saneColor(colormap) #print(f"Before resize: {colormap.shape}") colormap = at.resizeArray(colormap, (ncolors,colormap.shape[1])) #print(f"After resize: {colormap.shape}") if color.ndim > 1: #print(f"Before resize: {color.shape}") #print(color) color = at.resizeArray(color, shape[:-1]) #print(f"After resize: {color.shape}") #print(color) else: colormap = None if color.ndim > 1: #print(f"Before resize: {color.shape}") if color.ndim == 2: color = at.addAxis(color, 1) color = at.resizeArray(color, shape) #print(f"After resize: {color.shape}") pf.debug("SANECOLORSET RESULT: %s" % str(color.shape), pf.DEBUG.DRAW) return color, colormap
### End