125 lines
3.5 KiB
Ruby
125 lines
3.5 KiB
Ruby
# plot.rb
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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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#
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# 2-D plot widget demo (called by 'widget')
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#
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# toplevel widget
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if defined?($plot_demo) && $plot_demo
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$plot_demo.destroy
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$plot_demo = nil
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end
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# demo toplevel widget
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$plot_demo = TkToplevel.new {|w|
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title("Plot Demonstration")
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iconname("Plot")
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positionWindow(w)
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}
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base_frame = TkFrame.new($plot_demo).pack(:fill=>:both, :expand=>true)
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# label
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TkLabel.new(base_frame, 'font'=>$font, 'wraplength'=>'4i', 'justify'=>'left',
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'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('side'=>'top')
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}
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# frame
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$plot_buttons = TkFrame.new(base_frame) {|frame|
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TkButton.new(frame) {
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text 'Dismiss'
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command proc{
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tmppath = $plot_demo
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$plot_demo = nil
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tmppath.destroy
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}
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}.pack('side'=>'left', 'expand'=>'yes')
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TkButton.new(frame) {
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text 'Show Code'
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command proc{showCode 'plot'}
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}.pack('side'=>'left', 'expand'=>'yes')
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}
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$plot_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
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# font
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plotFont = '-*-Helvetica-Medium-R-Normal--*-180-*-*-*-*-*-*'
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# canvas
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$plot_canvas = TkCanvas.new(base_frame,'relief'=>'raised','width'=>450,'height'=>300)
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$plot_canvas.pack('side'=>'top', 'fill'=>'x')
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# plot
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TkcLine.new($plot_canvas, 100, 250, 400, 250, 'width'=>2)
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TkcLine.new($plot_canvas, 100, 250, 100, 50, 'width'=>2)
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TkcText.new($plot_canvas, 225, 20,
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'text'=>"A Simple Plot", 'font'=>plotFont, 'fill'=>'brown')
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(0..10).each {|i|
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x = 100 + (i * 30)
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TkcLine.new($plot_canvas, x, 250, x, 245, 'width'=>2)
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TkcText.new($plot_canvas, x, 254,
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'text'=>10*i, 'font'=>plotFont, 'anchor'=>'n')
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}
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(0..5).each {|i|
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y = 250 - (i * 40)
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TkcLine.new($plot_canvas, 100, y, 105, y, 'width'=>2)
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TkcText.new($plot_canvas, 96, y,
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'text'=>"#{i*50}.0", 'font'=>plotFont, 'anchor'=>'e')
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}
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for xx, yy in [[12,56],[20,94],[33,98],[32,120],[61,180],[75,160],[98,223]]
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x = 100 + (3*xx)
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y = 250 - (4*yy)/5
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item = TkcOval.new($plot_canvas, x-6, y-6, x+6, y+6,
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'width'=>1, 'outline'=>'black', 'fill'=>'SkyBlue2')
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item.addtag 'point'
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end
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$plot_canvas.itembind('point', 'Any-Enter',
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proc{$plot_canvas.itemconfigure 'current','fill','red'})
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$plot_canvas.itembind('point', 'Any-Leave',
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proc{$plot_canvas.itemconfigure 'current','fill','SkyBlue2'})
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$plot_canvas.itembind('point', '1',
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proc{|x,y| plotDown $plot_canvas,x,y}, "%x %y")
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$plot_canvas.itembind('point', 'ButtonRelease-1',
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proc{$plot_canvas.dtag 'selected'})
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$plot_canvas.bind('B1-Motion',
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proc{|x,y| plotMove $plot_canvas,x,y}, "%x %y")
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$plot = {'lastX'=>0, 'lastY'=>0}
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# plotDown --
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# This method 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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def plotDown (w, x, y)
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w.dtag 'selected'
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w.addtag_withtag 'selected', 'current'
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w.raise 'current'
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$plot['lastX'] = x
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$plot['lastY'] = y
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end
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# plotMove --
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# This method 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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def plotMove (w, x, y)
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w.move 'selected', x - $plot['lastX'], y - $plot['lastY']
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$plot['lastX'] = x
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$plot['lastY'] = y
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end
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