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|
--[[ Lua Poly Drawing functions
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2017 William Wilgus
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
]]
--[[ Exposed Functions
_poly.polygon
_poly.polyline
]]
if not rb.lcd_framebuffer then rb.splash(rb.HZ, "No Support!") return nil end
local _poly = {} do
local BSAND = 8 -- blits color to dst if src <> 0
local _NIL = nil -- nil placeholder
local _abs = math.abs
local _copy = rocklib_image.copy
local _line = rocklib_image.line
local flood_fill = require("draw_floodfill")
-- draws a non-filled figure based on points in t-points
local function polyline(img, x, y, t_points, color, bClosed, bClip)
if #t_points < 2 then error("not enough points", 3) end
local pt_first_last
if bClosed then
pt_first_last = t_points[1]
else
pt_first_last = t_points[#t_points]
end
for i = 1, #t_points, 1 do
local pt1 = t_points[i]
local pt2 = t_points[i + 1] or pt_first_last-- first and last point
_line(img, pt1[1] + x, pt1[2] + y, pt2[1] + x, pt2[2] + y, color, bClip)
end
end
-- draws a closed figure based on points in t_points
_poly.polygon = function(img, x, y, t_points, color, fillcolor, bClip)
if #t_points < 2 then error("not enough points", 3) end
if fillcolor then
local x_min, x_max = 0, 0
local y_min, y_max = 0, 0
local w, h = 0, 0
-- find boundries of polygon
for i = 1, #t_points, 1 do
local pt = t_points[i]
if pt[1] < x_min then x_min = pt[1] end
if pt[1] > x_max then x_max = pt[1] end
if pt[2] < y_min then y_min = pt[2] end
if pt[2] > y_max then y_max = pt[2] end
end
w = _abs(x_max) + _abs(x_min)
h = _abs(y_max) + _abs(y_min)
x_min = x_min - 2 -- leave a border to use flood_fill
y_min = y_min - 2
local fill_img = _newimg(w + 3, h + 3)
_clear(fill_img, 0x1)
for i = 1, #t_points, 1 do
local pt1 = t_points[i]
local pt2 = t_points[i + 1] or t_points[1]-- first and last point
_line(fill_img, pt1[1] - x_min, pt1[2] - y_min,
pt2[1]- x_min, pt2[2] - y_min, 0)
end
flood_fill(fill_img, fill_img:width(), fill_img:height() , 0x1, 0x0)
_copy(img, fill_img, x - 1, y - 1, _NIL, _NIL, _NIL, _NIL, bClip, BSAND, fillcolor)
end
polyline(img, x, y, t_points, color, true, bClip)
end
-- expose internal functions to the outside through _poly table
_poly.polyline = polyline
end
return _poly
|
