[back to homepage] Quiver
Pierre Bayerl
(software tool /plotting library for the Ulm Vision Group)


quiver greedytriangle -resolution 600 yos.zfa html/greedytriangle_big.png

Description: 'quiver.exe' is a plotting utility for visualizing 2D vector fields. A DLL (VFV-DLL, Vector Field Viewer) is provided to use the plotting capabilities of the 'quiver' utility in other applications. The DLL can also be used to implement new plotting methods.
The output files can be raster types (PPM, PNG, BMP, JPG) or vector graphics (EMF) with arbitrary resolution. Some plotting methods can also be combined (see below). Vector fields can be imported from pcm files and zfa files (conversion/read/write procedures provided via the VFV-DLL).

Quiver 'pi2006'

Different variations of the quiver 'pi2006':


quiver pi2006 -resolution -1 -h_arrow_count 12 -dyn_linewidth 0.1 yos.zfa html/pi2006.png

quiver pi2006 -resolution -1 -h_arrow_count 12 -dyn_linewidth 0.1 -colored_arrows 1 yos.zfa html/pi2006_colored_arrows.png

quiver pi2006 -resolution -1 -h_arrow_count 12 -dyn_linewidth 0.1 -filled_arrows 1 yos.zfa html/pi2006_filled_arrows.png

quiver pi2006 -resolution -1 -h_arrow_count 12 -dyn_linewidth 0.1 -ommit_outlines 1 yos.zfa html/pi2006_ommit_outines.png

quiver pi2006 -resolution -1 -h_arrow_count 18 -dyn_linewidth 0.1 -ommit_outlines 1 yos.zfa html/pi2006_ommit_outines2.png

Quiver 'motionstreaks'

Quiver 'motionstreaks' and an overlay of 'motionstreaks' with 'pi2006':


quiver motionstreaks -resolution -1 -min_v_threshold 0 -alpha 0.1 -random_luminance 1.0 yos.zfa html/motionstreaks.png

quiver pi2006 -resolution -1 -h_arrow_count 12 -ommit_outlines 1 -dyn_linewidth 0.1 -background html/motionstreaks.png yos.zfa html/combined_motionstreaks_pi2006.png

Quiver 'greedytriangle'

Quiver 'pi2006' without background and outlines vs. Quiver 'greedytriangle' without background and colors:


quiver pi2006 -resolution -1 -h_arrow_count 18 -dyn_linewidth 0.1 -ommit_outlines 1 -background white yos.zfa html/pi2006_ommit_outines_bw.png

quiver greedytriangle -resolution -1 -scale 7 -use_luminance 0 -background white yos.zfa html/greedytriangle_bw.png

Colored quiver 'greedytriangle' with and without background:


quiver greedytriangle -resolution -1 -scale 7 -background white yos.zfa html/greedytriangle_col.png

quiver greedytriangle -resolution -1 -scale 7 yos.zfa html/greedytriangle.png

(1.5MB-hires version of the 'greedyarrow'-quiverplot - zoom in to see the details)