1Graphics2D(3) User Contributed Perl Documentation Graphics2D(3)
2
6 PDL::Graphics2D - An object oriented interface to PDL graphics
7
9 use PDL::Graphics2D;
10 $win = PDL::Graphics2D->new(<Interface>, <Options>);
11 $w = imag2d( $image, 'Title Here', ... );
13
15 This is an umbrella class allowing for a simple interface to all
16 plotting routines in PDL. On its own it does not do any work it merely
17 passes information to the appropriate class. Ideally this should
18 probably offer a uniform interface to a variety of packages.
19 This requires a lot more work before it is useful I feel, but it can be
21 used already.
22
24 new
25 Create a 2-D graphics object with the requested interface type
26
28 imag2d
29 Display a 2-D image in a figure window
30 imag2d() creates a plain FreeGLUT OpenGL window and displays the input
32 image with 1:1 aspect ratio for pixels. The window resize is
33 constrained to the actual ratio of the image dimensions. The initial
34 display size is currently a 200x200 window to prevent things from being
35 too small by default.
36 The image to display can have dimensions ($c,$M,$N) where for $c==4 the
38 display is in GL_RGBA, for $c==3 the display is GL_RGB, for $c==2 the
39 display is GL_LUMINANCE_ALPHA, and for $c==1 or for for dimensions
40 ($M,$N) then the display is GL_LUMINANCE.
41 This routine does not yet thread but multiple images may be viewed at
43 the same time in separate windows by multiple calls to imag2d(). TriD
44 graphics visualization windows and the imag2d() windows may be created
45 and used independently.
46 NOTE: If you are twiddling a TriD window, the imag2d() windows are
48 active as well. If you call twiddle() the sub, only the imag2d()
49 windows will update correctly.
50 $window_id = imag2d($image, $name, $zoom, $x_off, $y_off);
52 creates a new image figure window from the input piddle
54 with the given title, zoom factor, and position (if possible)
55 $window_id - may be used to refer to the figure window
57 $image - 2D image piddle with at least 2 or 3 dimensions
59 e.g. [M,N], [1,M,N], [2,M,N], [3,M,N], [4,M,N]
60 $name - the name to use for the figure window (optional)
62 $zoom - desired (float) pixel zoom factor (optional)
64 ($x_off, $y_off) - desired window pixel position (optional)
66 with (0,0) as the top left pixel of the
67 display
68 use PDL::Graphics2D; # imports imag2d() and twiddle()
70 $x = sequence(64,48,3); # make test RGB image
72 $x = $x->mv(2,0); # color must be dim(0) with size [0..4]
73 $x /= $x->max; # pixel values in [0.0,1.0]
74 $x = sin(10*$x);
75 $w1 = imag2d($x); # with parens...
76 $w2 = imag2d $x->sqrt; # or without
77 $w3 = imag2d $x**2;
78 imag2d_update
80 Update an existing imag2d window with new piddle data
81 $image = random(3,64,48)/2 + 0.25; # random pixel image
83 $win = imag2d($image); # create original image display
84 imag2d_update($win, $image->sequence/$image->nelem); # update data
86 "imag2d_update" allows one to update an "imag2d" display window by
88 replacing the associated image data with new contents. The new image
89 data must be the same type and shape as the previous.
90 Eventually, we would like to implement this via some sort of dataflow
92 that would be transparent to the user.
93 twiddle
95 Enable GUI interaction with a FreeGLUT display window. With an
96 argument, it sets the default value for the auto-twiddling state. 0
97 will disable the automatic twiddling and 1 , or true, will enable
98 twiddling.
99 twiddle(); # same as twiddle(undef)
101 Runs the FreeGLUT event loop so window GUI operations
103 such as resize, expose, mouse click,.. work
104 twiddle(0); # disables twiddle looping for next twiddle() call
106 twiddle(1); # re-enables default twiddle looping for next twiddle() call
107perl v5.32.0 2020-09-17 Graphics2D(3)