55 lines
1009 B
Lua
55 lines
1009 B
Lua
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require("iupcdaux") -- utility module used in some samples
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dlg = iupcdaux.new_dialog(w, h)
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cnv = dlg[1] -- retrieve the IUP canvas
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function cnv:button_cb(button,pressed,x,y,r)
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canvas = self.canvas -- retrieve the CD canvas from the IUP attribute
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-- start drag if button1 is pressed
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if button ==iup.BUTTON1 and pressed == 1 then
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y = canvas:UpdateYAxis(y)
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-- prepare for XOR
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canvas:Foreground(cd.WHITE)
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canvas:WriteMode(cd.XOR)
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xstart = x
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ystart = y
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drag = 1
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first = 1
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else
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if (drag == 1) then
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drag = 0
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canvas:Rect(xstart,xend,ystart,yend)
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end
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end
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end
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function cnv:motion_cb(x,y,r)
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canvas = self.canvas -- retrieve the CD canvas from the IUP attribute
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if (drag == 1) then
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y = canvas:UpdateYAxis(y)
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if (first == 1) then
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first = 0
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else
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canvas:Rect(xstart,xend,ystart,yend)
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end
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canvas:Rect(xstart,x,ystart,y)
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xend = x
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yend = y
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end
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end
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first = 1
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drag = 0
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dlg:show()
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iup.MainLoop()
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