ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / share / tk8.5 / demos

# aniwave.tcl --
#
# This demonstration script illustrates how to adjust canvas item
# coordinates in a way that does something fairly similar to waveform
# display.

if {![info exists widgetDemo]} {
    error "This script should be run from the \"widget\" demo."
}

package require Tk

set w .aniwave
catch {destroy $w}
toplevel $w
wm title $w "Animated Wave Demonstration"
wm iconname $w "aniwave"
positionWindow $w

label $w.msg -font $font -wraplength 4i -justify left -text "This demonstration contains a canvas widget with a line item inside it. The animation routines work by adjusting the coordinates list of the line; a trace on a variable is used so updates to the variable result in a change of position of the line." 
pack $w.msg -side top

## See Code / Dismiss buttons
set btns [addSeeDismiss $w.buttons $w]
pack $btns -side bottom -fill x

# Create a canvas large enough to hold the wave. In fact, the wave
# sticks off both sides of the canvas to prevent visual glitches.
pack [canvas $w.c -width 300 -height 200 -background black] -padx 10 -pady 10 -expand yes

# Ensure that this this is an array
array set animationCallbacks {}

# Creates a coordinates list of a wave. This code does a very sketchy
# job and relies on Tk's line smoothing to make things look better.
set waveCoords {}
for {set x -10} {$x<=300} {incr x 5} {
    lappend waveCoords $x 100
}
lappend waveCoords $x 0 [incr x 5] 200

# Create a smoothed line and arrange for its coordinates to be the
# contents of the variable waveCoords.
$w.c create line $waveCoords -tags wave -width 1 -fill green -smooth 1
proc waveCoordsTracer {w args} {
    global waveCoords
    # Actual visual update will wait until we have finished
    # processing; Tk does that for us automatically.
    $w.c coords wave $waveCoords
}
trace add variable waveCoords write [list waveCoordsTracer $w]

# Basic motion handler. Given what direction the wave is travelling
# in, it advances the y coordinates in the coordinate-list one step in
# that direction.
proc basicMotion {} {
    global waveCoords direction
    set oc $waveCoords
    for {set i 1} {$i<[llength $oc]} {incr i 2} {
	if {$direction eq "left"} {
	    lset waveCoords $i [lindex $oc \
		    [expr {$i+2>[llength $oc] ? 1 : $i+2}]]
	} else {
	    lset waveCoords $i \
		    [lindex $oc [expr {$i-2<0 ? "end" : $i-2}]]
	}
    }
}

# Oscillation handler. This detects whether to reverse the direction
# of the wave by checking to see if the peak of the wave has moved off
# the screen (whose size we know already.)
proc reverser {} {
    global waveCoords direction
    if {[lindex $waveCoords 1] < 10} {
	set direction "right"
    } elseif {[lindex $waveCoords end] < 10} {
	set direction "left"
    }
}

# Main animation "loop". This calls the two procedures that handle the
# movement repeatedly by scheduling asynchronous calls back to itself
# using the [after] command. This procedure is the fundamental basis
# for all animated effect handling in Tk.
proc move {} {
    basicMotion
    reverser

# Theoretically 100 frames-per-second (==10ms between frames)
    global animationCallbacks
    set animationCallbacks(simpleWave) [after 10 move]
}

# Initialise our remaining animation variables
set direction "left"
set animateAfterCallback {}
# Arrange for the animation loop to stop when the canvas is deleted
bind $w.c <Destroy> {
    after cancel $animationCallbacks(simpleWave)
    unset animationCallbacks(simpleWave)
}
# Start the animation processing
move

[-] tree.tcl [edit]
[-] toolbar.tcl [edit]
[-] textpeer.tcl [edit]
[-] spin.tcl [edit]
[-] label.tcl [edit]
[-] ctext.tcl [edit]
[-] paned1.tcl [edit]
[-] button.tcl [edit]
[-] radio.tcl [edit]
[-] sayings.tcl [edit]
[+] ..
[-] timer [edit]
[-] ttkbut.tcl [edit]
[-] states.tcl [edit]
[-] README [edit]
[-] ttknote.tcl [edit]
[-] puzzle.tcl [edit]
[-] bind.tcl [edit]
[-] combo.tcl [edit]
[-] check.tcl [edit]
[-] paned2.tcl [edit]
[-] bitmap.tcl [edit]
[-] browse [edit]
[-] license.terms [edit]
[-] ttkscale.tcl [edit]
[-] plot.tcl [edit]
[-] rmt [edit]
[-] tcolor [edit]
[-] tclIndex [edit]
[-] ttkprogress.tcl [edit]
[-] arrow.tcl [edit]
[-] aniwave.tcl [edit]
[-] widget [edit]
[-] items.tcl [edit]
[-] style.tcl [edit]
[-] colors.tcl [edit]
[-] twind.tcl [edit]
[-] text.tcl [edit]
[-] labelframe.tcl [edit]
[-] entry1.tcl [edit]
[-] hello [edit]
[-] filebox.tcl [edit]
[-] knightstour.tcl [edit]
[-] dialog2.tcl [edit]
[-] ruler.tcl [edit]
[-] form.tcl [edit]
[-] dialog1.tcl [edit]
[-] msgbox.tcl [edit]
[-] ttkpane.tcl [edit]
[-] image2.tcl [edit]
[-] floor.tcl [edit]
[-] mclist.tcl [edit]
[-] menu.tcl [edit]
[-] ixset [edit]
[-] entry2.tcl [edit]
[-] rolodex [edit]
[+] images
[-] goldberg.tcl [edit]
[-] unicodeout.tcl [edit]
[-] vscale.tcl [edit]
[-] nl.msg [edit]
[-] search.tcl [edit]
[-] icon.tcl [edit]
[-] menubu.tcl [edit]
[-] ttkmenu.tcl [edit]
[-] en.msg [edit]
[-] anilabel.tcl [edit]
[-] entry3.tcl [edit]
[-] cscroll.tcl [edit]
[-] image1.tcl [edit]
[-] clrpick.tcl [edit]
[-] pendulum.tcl [edit]
[-] hscale.tcl [edit]