Class Heatmap

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A generator for heatmap images based on simulation log data.

Author: B. Henne

Instance Methods

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__init__(self, mapfilename, minlon, maxlon, minlat, maxlat, dotsize=30)
Initialize the heatmap generation object.

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_colorize(self, img, colors, opacity)
Use the colorscheme selected to color the image densities.

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__dotImage(self, size)
Returns a image of the dot that is used for drawing heatmap.

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__translate(self, xy)
Translates x,y coordinates into pixel offsets of a map.

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generate(self, logfilename, delimiter, t, x, y, t_start, t_end, step, reset_dotlayer_every_step=False)
Generates the heapmap PNG image files.

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mencode_video(self, location, files, filetype, videofile)
[Bad Video Quality] Encodes a set of image files to a video file using mencoder.

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Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Instance Variables

[hide private]

mapfile
filename of underlay map from osm export

minlon
min longitude from osm png export

maxlon
max longitude from osm png export

minlat
min latitude from osm png export

maxlat
max latitude from osm png export

Properties

[hide private]

Inherited from object: __class__

Method Details

[hide private]

init(self, mapfilename, minlon, maxlon, minlat, maxlat, dotsize=30)
(Constructor)

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Initialize the heatmap generation object.

Overrides: object.__init__

_colorize(self, img, colors, opacity)

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Use the colorscheme selected to color the image densities.

heatmap.py v1.0 20091004. from http://www.jjguy.com/heatmap/

generate(self, logfilename, delimiter, t, x, y, t_start, t_end, step, reset_dotlayer_every_step=False)

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Generates the heapmap PNG image files.

Parameters:

logfilename - name of csv-formated log file
delimiter - delimiter between columns in csv log file
t - number of log file's column containing time
x - number of log file's column containing x-value
y - number of log file's column containing y-value
t_start - start of output time interval
t_end - end of output time interval
step - size/length of a log accumulation step
reset_dotlayer_every_step - draw second heatmap over first one etc. or clear for each image

mencode_video(self, location, files, filetype, videofile)

source code

[Bad Video Quality] Encodes a set of image files to a video file using mencoder.

Better use:

mencoder mf://PNG/heatmap1*.png -mf type=png:w=780:h=600:fps=30 -o /dev/null -ovc x264 -x264encopts pass=1:bitrate=1200:bframes=1:me=umh:partitions=all:trellis=1:qp_step=4:qcomp=0.7:direct_pred=auto:keyint=300 -vf crop=768:576:0:0
mencoder mf://PNG/heatmap1*.png -mf type=png:w=780:h=600:fps=30 -o heatmap1.avi -ovc x264 -x264encopts pass=2:bitrate=1200:bframes=1:me=umh:partitions=all:trellis=1:qp_step=4:qcomp=0.7:direct_pred=auto:keyint=300 -vf crop=768:576:0:0

Class Heatmap

__init__(self, mapfilename, minlon, maxlon, minlat, maxlat, dotsize=30) (Constructor)

_colorize(self, img, colors, opacity)

generate(self, logfilename, delimiter, t, x, y, t_start, t_end, step, reset_dotlayer_every_step=False)

mencode_video(self, location, files, filetype, videofile)

init(self, mapfilename, minlon, maxlon, minlat, maxlat, dotsize=30)
(Constructor)