128 lines
4.6 KiB
Lua
128 lines
4.6 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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--[[
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every 2 elements in t_pts is an x, y coord pair
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p[?] = {x,y,x,y,x,y}
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lines get drawn between the coords
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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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-- Internal Constants
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local rocklib_image = getmetatable(rb.lcd_framebuffer())
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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 _clear = rocklib_image.clear
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local _copy = rocklib_image.copy
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local _line = rocklib_image.line
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local _newimg = rb.new_image
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local flood_fill
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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_pts, color, bClosed, bClip, scale_x, scale_y)
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scale_x = scale_x or 1
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scale_y = scale_y or 1
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local pt_first_last, pt1, pt2
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local max_x, max_y = 0, 0
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local len = #t_pts
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if len < 4 then error("not enough points", 3) end
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if bClosed then
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pt_first_last = {t_pts[1] * scale_x, t_pts[2] * scale_y}
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else
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pt_first_last = {t_pts[len - 1] * scale_x, t_pts[len] * scale_y}
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end
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pt2 = {t_pts[1] * scale_x, t_pts[2] * scale_y}
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for i = 3, len + 2, 2 do
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pt1 = pt2
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if t_pts[i + 1] == nil then
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pt2 = pt_first_last
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else
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pt2 = {t_pts[i] * scale_x, t_pts[i + 1] * scale_y}
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end-- 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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if pt1[1] > max_x then max_x = pt1[1] end
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if pt1[2] > max_y then max_y = pt1[2] end
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end
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if pt2[1] > max_x then max_x = pt2[1] end
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if pt2[2] > max_y then max_y = pt2[2] end
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return max_x + x, max_y + y
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end
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-- draws a closed figure based on points in t_pts
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_poly.polygon = function(img, x, y, t_pts, color, fillcolor, bClip, scale_x, scale_y)
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scale_x = scale_x or 1
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scale_y = scale_y or 1
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if #t_pts < 2 then error("not enough points", 3) end
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if fillcolor then
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flood_fill = flood_fill or require("draw_floodfill")
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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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local pt1, pt2
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-- find boundries of polygon
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for i = 1, #t_pts, 2 do
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if t_pts[i] < x_min then x_min = t_pts[i] end
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if t_pts[i] > x_max then x_max = t_pts[i] end
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if t_pts[i+1] < y_min then y_min = t_pts[i+1] end
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if t_pts[i+1] > y_max then y_max = t_pts[i+1] end
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end
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x_max = x_max * scale_x
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x_min = x_min * scale_x
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y_max = y_max * scale_y
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y_min = y_min * scale_y
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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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polyline(fill_img, x_min, y_min, t_pts,
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0x0, true, bClip, scale_x, scale_y)
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-- flood the outside of the figure with 0 the inside will be fillcolor
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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,
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_NIL, _NIL, _NIL, _NIL, bClip, BSAND, fillcolor)
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end
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polyline(img, x, y, t_pts, color, true, bClip, scale_x, scale_y)
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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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