Hi, all!
WinXP 32bit, iuplua 3.6 - 3.9.
Playing with iup.canvas, I found that the ends of the vertical lines
near the boundaries of the canvas looks strange. The effect becomes
noticeable for a line width of 2 or more. Unpainted point becomes
visible at the upper end of the line. At the lower end of the line
appears vertical indentation height 1. Effect does not depend on the
presence of border canvas.
See example in attach.
--
Regards,
Karagy
require "cdlua"
require "iuplua"
require "iupluacd"
local debug_width = iup.label{ size = "50x", }
function debug_width:set(val)
self.title = string.format("Width: %5i", val)
end
local debug_height = iup.label{ size = "50x", }
function debug_height:set(val)
self.title = string.format("Height: %5i", val)
end
local debug_x = iup.label{ size = "50x", }
function debug_x:set(val)
self.title = string.format("X: %5i", val)
end
local debug_y1 = iup.label{ size = "50x", }
function debug_y1:set(val)
self.title = string.format("Y: %5i", val)
end
local debug_y2 = iup.label{ size = "50x", }
function debug_y2:set(val)
self.title = string.format("Y: %5i", val)
end
local debug_write_mode = iup.label{ size = "100x", }
function debug_write_mode:set(val)
self.title = string.format("WriteMode: %s", val)
end
local debug_line_color = iup.label{ size = "100x", }
function debug_line_color:set(val)
self.title = string.format("COLOR: r:%i g:%i b:%i", cd.DecodeColor(val))
end
local debug_line_join = iup.label{ size = "100x", }
function debug_line_join:set(val)
self.title = string.format("LineJoin: %i", val)
end
local debug_line_cap = iup.label{ size = "100x", }
function debug_line_cap:set(val)
self.title = string.format("LineCap: %i", val)
end
local cnv = iup.canvas {
rastersize = "x24",
expand = "HORIZONTAL",
--border = "NO",
-- user-defined attrs
line_width = 1,
write_mode = cd.XOR,
line_join = cd.MITER,
line_cap = cd.CAPFLAT,
line_color = cd.EncodeColor(0, 255, 255),
}
function cnv:map_cb()
self.canvas = cd.CreateCanvas(cd.IUP, self)
end
-- draw vertical bar
function cnv:draw_vline(x)
local c = self.canvas
c:Activate()
local w,h = c:GetSize()
debug_width:set(w)
debug_height:set(h)
local y1, y2 = 0, h-1
debug_x:set(x)
debug_y1:set(y1)
debug_y2:set(y2)
c:WriteMode(self.write_mode)
c:LineWidth(self.line_width)
c:Foreground(self.line_color)
c:LineJoin(self.line_join)
c:LineCap(self.line_cap)
debug_line_color:set(c:Foreground(cd.QUERY))
debug_write_mode:set(c:WriteMode(cd.QUERY))
debug_line_join:set(c:LineJoin(cd.QUERY))
debug_line_cap:set(c:LineCap(cd.QUERY))
c:Line(x,y1,x,y2)
c:Deactivate()
end
function cnv:move_vline(x)
local w,h = self.canvas:GetSize()
if x >= 0 and x < w then
local _x = self.old_x or x
if _x ~= x then
self:draw_vline(_x)
_x = x
end
self:draw_vline(x)
self.old_x = _x
end
end
function cnv:button_cb(but, pressed, x, y, status)
if but == iup.BUTTON1
then
self.old_x = pressed == 1 and x
self:draw_vline(x)
end
end
function cnv:motion_cb(x, y, status)
if status:sub(3,3) == "1" then
self:move_vline(x)
end
end
local dlg = iup.dialog {
iup.frame{
iup.vbox{
margin = "2x2",
-- canvas
iup.hbox{
cnv,
},
iup.hbox{
iup.frame{
title = "LineWidth",
iup.vbox{
margin = "10x",
iup.fill{},
iup.text{
visiblecolumns = 2,
spin = "YES",
spinmin = 1,
spin_cb = function (self, pos)
cnv.line_width = pos
end,
},
iup.fill{},
},
},
iup.frame{
title = "WriteMode",
iup.radio{
iup.vbox{
iup.toggle{
title="XOR",
action = function (self, state)
if state == 1 then
cnv.write_mode = cd.XOR
end
end,
},
iup.toggle{
title="REPLACE",
action = function (self, state)
if state == 1 then
cnv.write_mode = cd.REPLACE
end
end,
},
iup.fill{},
},
},
},
iup.frame{
title = "LineJoin",
iup.radio{
iup.vbox{
iup.toggle{
title="MITER",
action = function (self, state)
if state == 1 then
cnv.line_join = cd.MITER
end
end,
},
iup.toggle{
title="BEVEL",
action = function (self, state)
if state == 1 then
cnv.line_join = cd.BEVEL
end
end,
},
iup.toggle{
title="ROUND",
action = function (self, state)
if state == 1 then
cnv.line_join = cd.ROUND
end
end,
},
iup.fill{},
},
},
},
iup.frame{
title = "LineCap",
iup.radio{
iup.vbox{
iup.toggle{
title="CAPFLAT",
action = function (self, state)
if state == 1 then
cnv.line_cap = cd.CAPFLAT
end
end,
},
iup.toggle{
title="CAPSQUARE",
action = function (self, state)
if state == 1 then
cnv.line_cap = cd.CAPSQUARE
end
end,
},
iup.toggle{
title="CAPROUND",
action = function (self, state)
if state == 1 then
cnv.line_cap = cd.CAPROUND
end
end,
},
iup.fill{},
},
},
},
iup.frame{
title = "Debug",
iup.hbox{
iup.vbox{
debug_width,
debug_height,
},
iup.vbox{
debug_x,
debug_y1,
debug_y2,
},
iup.vbox{
debug_line_color,
debug_write_mode,
debug_line_join,
debug_line_cap,
},
},
},
},
},
},
size = "HALFx",
}
dlg:showxy(iup.CENTER, iup.CENTER)
iup.MainLoop()
------------------------------------------------------------------------------
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