git.zerfleddert.de Git - micropolis/blob - src/tk/library/demos/mkPlot.tcl

   1 # mkPlot w
   2 #
   3 # Create a top-level window containing a canvas displaying a simple
   4 # graph with data points that can be moved interactively.
   5 #
   6 # Arguments:
   7 #    w -        Name to use for new top-level window.
   8
   9 proc mkPlot {{w .plot}} {
  10     catch {destroy $w}
  11     toplevel $w
  12     dpos $w
  13     wm title $w "Plot Demonstration"
  14     wm iconname $w "Plot"
  15     set c $w.c
  16
  17     frame $w.frame1 -relief raised -bd 2
  18     canvas $c -relief raised -width 450 -height 300
  19     button $w.ok -text "OK" -command "destroy $w"
  20     pack append $w $w.frame1 {top fill} $w.c {expand fill} \
  21             $w.ok {bottom pady 10 frame center}
  22     message $w.frame1.m -font -Adobe-Times-Medium-R-Normal-*-180-* -aspect 300 \
  23             -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."
  24     pack append $w.frame1 $w.frame1.m {frame center}
  25
  26     set font -Adobe-helvetica-medium-r-*-180-*
  27
  28     $c create line 100 250 400 250 -width 2
  29     $c create line 100 250 100 50 -width 2
  30     $c create text 225 20 -text "A Simple Plot" -font $font -fill brown
  31
  32     for {set i 0} {$i <= 10} {incr i} {
  33         set x [expr {100 + ($i*30)}]
  34         $c create line $x 250 $x 245 -width 2
  35         $c create text $x 254 -text [expr 10*$i] -anchor n -font $font
  36     }
  37     for {set i 0} {$i <= 5} {incr i} {
  38         set y [expr {250 - ($i*40)}]
  39         $c create line 100 $y 105 $y -width 2
  40         $c create text 96 $y -text [expr $i*50].0 -anchor e -font $font
  41     }
  42
  43     foreach point {{12 56} {20 94} {33 98} {32 120} {61 180}
  44             {75 160} {98 223}} {
  45         set x [expr {100 + (3*[lindex $point 0])}]
  46         set y [expr {250 - (4*[lindex $point 1])/5}]
  47         set item [$c create oval [expr $x-6] [expr $y-6] \
  48                 [expr $x+6] [expr $y+6] -width 1 -outline black \
  49                 -fill SkyBlue2]
  50         $c addtag point withtag $item
  51     }
  52
  53     $c bind point <Any-Enter> "$c itemconfig current -fill red"
  54     $c bind point <Any-Leave> "$c itemconfig current -fill SkyBlue2"
  55     $c bind point <1> "plotDown $c %x %y"
  56     $c bind point <ButtonRelease-1> "$c dtag selected"
  57     bind $c <B1-Motion> "plotMove $c %x %y"
  58 }
  59
  60 set plot(lastX) 0
  61 set plot(lastY) 0
  62
  63 proc plotDown {w x y} {
  64     global plot
  65     $w dtag selected
  66     $w addtag selected withtag current
  67     $w raise current
  68     set plot(lastX) $x
  69     set plot(lastY) $y
  70 }
  71
  72 proc plotMove {w x y} {
  73     global plot
  74     $w move selected [expr $x-$plot(lastX)] [expr $y-$plot(lastY)]
  75     set plot(lastX) $x
  76     set plot(lastY) $y
  77 }