f85df30e3e
Change-Id: I67cac5bc4ce5525ab30abf9443f6cc1a33190512
103 lines
3.7 KiB
Lua
103 lines
3.7 KiB
Lua
--[[ Lua Poly Drawing functions
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2017 William Wilgus
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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]]
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--[[ Exposed Functions
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_poly.polygon
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_poly.polyline
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]]
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if not rb.lcd_framebuffer then rb.splash(rb.HZ, "No Support!") return nil end
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local _poly = {} do
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local BSAND = 8 -- blits color to dst if src <> 0
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local _NIL = nil -- nil placeholder
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local _abs = math.abs
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local _copy = rocklib_image.copy
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local _line = rocklib_image.line
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local flood_fill = require("draw_floodfill")
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-- draws a non-filled figure based on points in t-points
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local function polyline(img, x, y, t_points, color, bClosed, bClip)
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if #t_points < 2 then error("not enough points", 3) end
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local pt_first_last
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if bClosed then
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pt_first_last = t_points[1]
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else
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pt_first_last = t_points[#t_points]
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end
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for i = 1, #t_points, 1 do
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local pt1 = t_points[i]
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local pt2 = t_points[i + 1] or pt_first_last-- first and last point
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_line(img, pt1[1] + x, pt1[2] + y, pt2[1] + x, pt2[2] + y, color, bClip)
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end
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end
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-- draws a closed figure based on points in t_points
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_poly.polygon = function(img, x, y, t_points, color, fillcolor, bClip)
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if #t_points < 2 then error("not enough points", 3) end
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if fillcolor then
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local x_min, x_max = 0, 0
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local y_min, y_max = 0, 0
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local w, h = 0, 0
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-- find boundries of polygon
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for i = 1, #t_points, 1 do
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local pt = t_points[i]
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if pt[1] < x_min then x_min = pt[1] end
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if pt[1] > x_max then x_max = pt[1] end
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if pt[2] < y_min then y_min = pt[2] end
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if pt[2] > y_max then y_max = pt[2] end
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end
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w = _abs(x_max) + _abs(x_min)
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h = _abs(y_max) + _abs(y_min)
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x_min = x_min - 2 -- leave a border to use flood_fill
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y_min = y_min - 2
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local fill_img = _newimg(w + 3, h + 3)
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_clear(fill_img, 0x1)
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for i = 1, #t_points, 1 do
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local pt1 = t_points[i]
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local pt2 = t_points[i + 1] or t_points[1]-- first and last point
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_line(fill_img, pt1[1] - x_min, pt1[2] - y_min,
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pt2[1]- x_min, pt2[2] - y_min, 0)
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end
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flood_fill(fill_img, fill_img:width(), fill_img:height() , 0x1, 0x0)
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_copy(img, fill_img, x - 1, y - 1, _NIL, _NIL, _NIL, _NIL, bClip, BSAND, fillcolor)
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end
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polyline(img, x, y, t_points, color, true, bClip)
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end
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-- expose internal functions to the outside through _poly table
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_poly.polyline = polyline
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end
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return _poly
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