the graph widget can even be used for excessive amounts of data:<<br>>
[waveform]
<<br>>
#!/usr/bin/wish
package require BLT
namespace import ::blt::vector
namespace import ::blt::graph
# create a graph widget and show a grid
graph .g ; pack .g -expand 1 -fill both
.g grid configure -hide no
# enable zooming
Blt_ZoomStack .g
set start [ clock clicks -milliseconds ]
# create two vectors,
set ::X [ vector #auto ]
set ::Y [ vector #auto ]
# fill one vector for the x axis with 1 million points
$::X seq 0 1.0e6
# fill one vector for the y axis with a sine + noise
$::Y expr "sin($::X/1e5) +(0.05*(random($::X)-0.5))"
# create one element with data for the x and y axis, no dots
.g element create Wave1 -xdata $::X -ydata $::Y -symbol none
set stop [ clock clicks -milliseconds ]
puts time_blt_vector_example:[expr ($stop - $start)/ 1000.0]
----
[AET] 24jan07 Erm . . .it chokes on the random() call. I'm using dqkit (tcl8.4.5). Complains
can't find vector "random"
Tried srand(), same result.
[UK] pasting this into wish runs without fault. Did you loose the quotes? ... Just tested with kit-8.4.13-build1-linux-x86-STall.bin : no probs
[LV] I just copy and pasted this example into a text file and ran it against Tcl/Tk 8.4.7 and BLT 3.0. I get this error:
Error in startup script: can't import command "label": already exists
while executing
"namespace import ::blt::*"
(file "/tmp/samblt.tk" line 5)
Anyone have any idea what might be going wrong?
[UK] I guess BLT has grown a [[label]] command? apropos: BLT 3.0 from cvs at sourceforge?
<<categories>> BLT | Example | Graphics | Plotting