[37] | 1 | # plot.tcl -- |
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| 2 | # |
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| 3 | # This demonstration script creates a canvas widget showing a 2-D |
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| 4 | # plot with data points that can be dragged with the mouse. |
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| 5 | # |
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| 6 | # RCS: @(#) $Id: plot.tcl,v 1.2 1998/09/14 18:23:29 stanton Exp $ |
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| 7 | |
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| 8 | if {![info exists widgetDemo]} { |
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| 9 | error "This script should be run from the \"widget\" demo." |
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| 10 | } |
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| 11 | |
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| 12 | set w .plot |
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| 13 | catch {destroy $w} |
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| 14 | toplevel $w |
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| 15 | wm title $w "Plot Demonstration" |
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| 16 | wm iconname $w "Plot" |
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| 17 | positionWindow $w |
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| 18 | set c $w.c |
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| 19 | |
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| 20 | 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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| 21 | pack $w.msg -side top |
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| 22 | |
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| 23 | frame $w.buttons |
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| 24 | pack $w.buttons -side bottom -fill x -pady 2m |
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| 25 | button $w.buttons.dismiss -text Dismiss -command "destroy $w" |
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| 26 | button $w.buttons.code -text "See Code" -command "showCode $w" |
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| 27 | pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 |
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| 28 | |
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| 29 | canvas $c -relief raised -width 450 -height 300 |
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| 30 | pack $w.c -side top -fill x |
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| 31 | |
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| 32 | set plotFont {Helvetica 18} |
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| 33 | |
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| 34 | $c create line 100 250 400 250 -width 2 |
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| 35 | $c create line 100 250 100 50 -width 2 |
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| 36 | $c create text 225 20 -text "A Simple Plot" -font $plotFont -fill brown |
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| 37 | |
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| 38 | for {set i 0} {$i <= 10} {incr i} { |
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| 39 | set x [expr {100 + ($i*30)}] |
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| 40 | $c create line $x 250 $x 245 -width 2 |
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| 41 | $c create text $x 254 -text [expr 10*$i] -anchor n -font $plotFont |
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| 42 | } |
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| 43 | for {set i 0} {$i <= 5} {incr i} { |
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| 44 | set y [expr {250 - ($i*40)}] |
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| 45 | $c create line 100 $y 105 $y -width 2 |
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| 46 | $c create text 96 $y -text [expr $i*50].0 -anchor e -font $plotFont |
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| 47 | } |
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| 48 | |
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| 49 | foreach point {{12 56} {20 94} {33 98} {32 120} {61 180} |
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| 50 | {75 160} {98 223}} { |
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| 51 | set x [expr {100 + (3*[lindex $point 0])}] |
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| 52 | set y [expr {250 - (4*[lindex $point 1])/5}] |
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| 53 | set item [$c create oval [expr $x-6] [expr $y-6] \ |
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| 54 | [expr $x+6] [expr $y+6] -width 1 -outline black \ |
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| 55 | -fill SkyBlue2] |
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| 56 | $c addtag point withtag $item |
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| 57 | } |
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| 58 | |
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| 59 | $c bind point <Any-Enter> "$c itemconfig current -fill red" |
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| 60 | $c bind point <Any-Leave> "$c itemconfig current -fill SkyBlue2" |
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| 61 | $c bind point <1> "plotDown $c %x %y" |
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| 62 | $c bind point <ButtonRelease-1> "$c dtag selected" |
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| 63 | bind $c <B1-Motion> "plotMove $c %x %y" |
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| 64 | |
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| 65 | set plot(lastX) 0 |
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| 66 | set plot(lastY) 0 |
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| 67 | |
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| 68 | # plotDown -- |
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| 69 | # This procedure is invoked when the mouse is pressed over one of the |
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| 70 | # data points. It sets up state to allow the point to be dragged. |
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| 71 | # |
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| 72 | # Arguments: |
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| 73 | # w - The canvas window. |
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| 74 | # x, y - The coordinates of the mouse press. |
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| 75 | |
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| 76 | proc plotDown {w x y} { |
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| 77 | global plot |
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| 78 | $w dtag selected |
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| 79 | $w addtag selected withtag current |
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| 80 | $w raise current |
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| 81 | set plot(lastX) $x |
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| 82 | set plot(lastY) $y |
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| 83 | } |
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| 84 | |
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| 85 | # plotMove -- |
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| 86 | # This procedure is invoked during mouse motion events. It drags the |
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| 87 | # current item. |
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| 88 | # |
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| 89 | # Arguments: |
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| 90 | # w - The canvas window. |
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| 91 | # x, y - The coordinates of the mouse. |
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| 92 | |
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| 93 | proc plotMove {w x y} { |
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| 94 | global plot |
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| 95 | $w move selected [expr $x-$plot(lastX)] [expr $y-$plot(lastY)] |
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| 96 | set plot(lastX) $x |
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| 97 | set plot(lastY) $y |
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| 98 | } |
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