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98 lines
2.7 KiB
98 lines
2.7 KiB
6 years ago
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# plot.tcl --
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#
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# This demonstration script creates a canvas widget showing a 2-D
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# plot with data points that can be dragged with the mouse.
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if {![info exists widgetDemo]} {
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error "This script should be run from the \"widget\" demo."
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}
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package require Tk
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set w .plot
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catch {destroy $w}
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toplevel $w
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wm title $w "Plot Demonstration"
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wm iconname $w "Plot"
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positionWindow $w
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set c $w.c
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label $w.msg -font $font -wraplength 4i -justify left -text "This window displays a canvas widget containing a simple 2-dimensional plot. You can doctor the data by dragging any of the points with mouse button 1."
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pack $w.msg -side top
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## See Code / Dismiss buttons
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set btns [addSeeDismiss $w.buttons $w]
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pack $btns -side bottom -fill x
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canvas $c -relief raised -width 450 -height 300
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pack $w.c -side top -fill x
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set plotFont {Helvetica 18}
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$c create line 100 250 400 250 -width 2
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$c create line 100 250 100 50 -width 2
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$c create text 225 20 -text "A Simple Plot" -font $plotFont -fill brown
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for {set i 0} {$i <= 10} {incr i} {
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set x [expr {100 + ($i*30)}]
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$c create line $x 250 $x 245 -width 2
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$c create text $x 254 -text [expr {10*$i}] -anchor n -font $plotFont
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}
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for {set i 0} {$i <= 5} {incr i} {
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set y [expr {250 - ($i*40)}]
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$c create line 100 $y 105 $y -width 2
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$c create text 96 $y -text [expr {$i*50}].0 -anchor e -font $plotFont
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}
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foreach point {
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{12 56} {20 94} {33 98} {32 120} {61 180} {75 160} {98 223}
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} {
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set x [expr {100 + (3*[lindex $point 0])}]
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set y [expr {250 - (4*[lindex $point 1])/5}]
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set item [$c create oval [expr {$x-6}] [expr {$y-6}] \
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[expr {$x+6}] [expr {$y+6}] -width 1 -outline black \
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-fill SkyBlue2]
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$c addtag point withtag $item
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}
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$c bind point <Any-Enter> "$c itemconfig current -fill red"
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$c bind point <Any-Leave> "$c itemconfig current -fill SkyBlue2"
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$c bind point <1> "plotDown $c %x %y"
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$c bind point <ButtonRelease-1> "$c dtag selected"
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bind $c <B1-Motion> "plotMove $c %x %y"
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set plot(lastX) 0
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set plot(lastY) 0
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# plotDown --
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# This procedure is invoked when the mouse is pressed over one of the
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# data points. It sets up state to allow the point to be dragged.
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#
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# Arguments:
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# w - The canvas window.
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# x, y - The coordinates of the mouse press.
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proc plotDown {w x y} {
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global plot
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$w dtag selected
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$w addtag selected withtag current
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$w raise current
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set plot(lastX) $x
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set plot(lastY) $y
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}
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# plotMove --
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# This procedure is invoked during mouse motion events. It drags the
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# current item.
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#
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# Arguments:
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# w - The canvas window.
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# x, y - The coordinates of the mouse.
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proc plotMove {w x y} {
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global plot
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$w move selected [expr {$x-$plot(lastX)}] [expr {$y-$plot(lastY)}]
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set plot(lastX) $x
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set plot(lastY) $y
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}
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