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# plot.rb
#
# This demonstration script creates a canvas widget showing a 2-D
# plot with data points that can be dragged with the mouse.
#
# 2-D plot widget demo (called by 'widget')
#
# toplevel widget
if defined?($plot_demo) && $plot_demo
$plot_demo.destroy
$plot_demo = nil
end
# demo toplevel widget
$plot_demo = TkToplevel.new {|w|
title("Plot Demonstration")
iconname("Plot")
positionWindow(w)
}
# label
TkLabel.new($plot_demo, '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."){
pack('side'=>'top')
}
# frame
$plot_buttons = TkFrame.new($plot_demo) {|frame|
TkButton.new(frame) {
text 'Dismiss'
command proc{
tmppath = $plot_demo
$plot_demo = nil
tmppath.destroy
}
}.pack('side'=>'left', 'expand'=>'yes')
TkButton.new(frame) {
text 'Show Code'
command proc{showCode 'plot'}
}.pack('side'=>'left', 'expand'=>'yes')
}
$plot_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
# font
plotFont = '-*-Helvetica-Medium-R-Normal--*-180-*-*-*-*-*-*'
# canvas
$plot_canvas = TkCanvas.new($plot_demo,'relief'=>'raised','width'=>450,'height'=>300)
$plot_canvas.pack('side'=>'top', 'fill'=>'x')
# plot
TkcLine.new($plot_canvas, 100, 250, 400, 250, 'width'=>2)
TkcLine.new($plot_canvas, 100, 250, 100, 50, 'width'=>2)
TkcText.new($plot_canvas, 225, 20,
'text'=>"A Simple Plot", 'font'=>plotFont, 'fill'=>'brown')
(0..10).each {|i|
x = 100 + (i * 30)
TkcLine.new($plot_canvas, x, 250, x, 245, 'width'=>2)
TkcText.new($plot_canvas, x, 254,
'text'=>10*i, 'font'=>plotFont, 'anchor'=>'n')
}
(0..5).each {|i|
y = 250 - (i * 40)
TkcLine.new($plot_canvas, 100, y, 105, y, 'width'=>2)
TkcText.new($plot_canvas, 96, y,
'text'=>"#{i*50}.0", 'font'=>plotFont, 'anchor'=>'e')
}
for xx, yy in [[12,56],[20,94],[33,98],[32,120],[61,180],[75,160],[98,223]]
x = 100 + (3*xx)
y = 250 - (4*yy)/5
item = TkcOval.new($plot_canvas, x-6, y-6, x+6, y+6,
'width'=>1, 'outline'=>'black', 'fill'=>'SkyBlue2')
item.addtag 'point'
end
$plot_canvas.itembind('point', 'Any-Enter',
proc{$plot_canvas.itemconfigure 'current','fill','red'})
$plot_canvas.itembind('point', 'Any-Leave',
proc{$plot_canvas.itemconfigure 'current','fill','SkyBlue2'})
$plot_canvas.itembind('point', '1',
proc{|x,y| plotDown $plot_canvas,x,y}, "%x %y")
$plot_canvas.itembind('point', 'ButtonRelease-1',
proc{$plot_canvas.dtag 'selected'})
$plot_canvas.bind('B1-Motion',
proc{|x,y| plotMove $plot_canvas,x,y}, "%x %y")
$plot = {'lastX'=>0, 'lastY'=>0}
# plotDown --
# This method is invoked when the mouse is pressed over one of the
# data points. It sets up state to allow the point to be dragged.
#
# Arguments:
# w - The canvas window.
# x, y - The coordinates of the mouse press.
def plotDown (w, x, y)
w.dtag 'selected'
w.addtag_withtag 'selected', 'current'
w.raise 'current'
$plot['lastX'] = x
$plot['lastY'] = y
end
# plotMove --
# This method is invoked during mouse motion events. It drags the
# current item.
#
# Arguments:
# w - The canvas window.
# x, y - The coordinates of the mouse.
def plotMove (w, x, y)
w.move 'selected', x - $plot['lastX'], y - $plot['lastY']
$plot['lastX'] = x
$plot['lastY'] = y
end
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