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 1.3 2001/06/14 10:56:58 dkf 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 { |
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50 | {12 56} {20 94} {33 98} {32 120} {61 180} {75 160} {98 223} |
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51 | } { |
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52 | set x [expr {100 + (3*[lindex $point 0])}] |
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53 | set y [expr {250 - (4*[lindex $point 1])/5}] |
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54 | set item [$c create oval [expr {$x-6}] [expr {$y-6}] \ |
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55 | [expr {$x+6}] [expr {$y+6}] -width 1 -outline black \ |
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56 | -fill SkyBlue2] |
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57 | $c addtag point withtag $item |
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58 | } |
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59 | |
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60 | $c bind point <Any-Enter> "$c itemconfig current -fill red" |
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61 | $c bind point <Any-Leave> "$c itemconfig current -fill SkyBlue2" |
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62 | $c bind point <1> "plotDown $c %x %y" |
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63 | $c bind point <ButtonRelease-1> "$c dtag selected" |
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64 | bind $c <B1-Motion> "plotMove $c %x %y" |
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65 | |
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66 | set plot(lastX) 0 |
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67 | set plot(lastY) 0 |
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68 | |
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69 | # plotDown -- |
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70 | # This procedure is invoked when the mouse is pressed over one of the |
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71 | # data points. It sets up state to allow the point to be dragged. |
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72 | # |
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73 | # Arguments: |
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74 | # w - The canvas window. |
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75 | # x, y - The coordinates of the mouse press. |
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76 | |
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77 | proc plotDown {w x y} { |
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78 | global plot |
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79 | $w dtag selected |
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80 | $w addtag selected withtag current |
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81 | $w raise current |
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82 | set plot(lastX) $x |
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83 | set plot(lastY) $y |
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84 | } |
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85 | |
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86 | # plotMove -- |
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87 | # This procedure is invoked during mouse motion events. It drags the |
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88 | # current item. |
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89 | # |
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90 | # Arguments: |
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91 | # w - The canvas window. |
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92 | # x, y - The coordinates of the mouse. |
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93 | |
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94 | proc plotMove {w x y} { |
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95 | global plot |
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96 | $w move selected [expr {$x-$plot(lastX)}] [expr {$y-$plot(lastY)}] |
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97 | set plot(lastX) $x |
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98 | set plot(lastY) $y |
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99 | } |
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