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#
# Example of BLT simplify command. Performs line simplication on x and y
# vectors, filling results in two output vectors. The last argument is the
# tolerance.
#
package require BLT
set afterId -1
proc UpdateGraph {} {
global afterId
after cancel $afterId
set afterId [after idle Simplify]
}
proc Simplify {} {
global afterId
blt::simplify x0 y0 xs ys [.s get mark]
set afterId -1
}
blt::graph .g \
-width 700
blt::scale .s \
-min 0.0 \
-max 0.5 \
-command UpdateGraph \
-hide minarrow \
-hide maxarrow
blt::table . \
0,0 .g -fill both \
1,0 .s -fill x
blt::table configure . c* r* -resize none
blt::table configure . c0 r0* -resize both
blt::vector x0
blt::vector y0
blt::vector xs
blt::vector ys
.g element create simplified \
-x xs \
-y ys \
-pixels 3 \
-label simplified \
-color red4 -fill red1 \
.g element create original \
-x x0 \
-y y0 \
-pixels 3 \
-label original \
-color green4 -fill green2 \
-dashes 1
.g axis configure x -title "radians"
.g axis configure y -title "sine"
x0 seq -180 360 5
set pi 3.14159265358979323846
set pi1_2 [expr $pi/180.0]
x0 expr {x0 * $pi1_2}
y0 expr {(random(x0)-0.5) * 0.5 + sin(x0) }
.s set 0.25
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