104 lines
3.7 KiB
Lua
104 lines
3.7 KiB
Lua
|
--[[ 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
|