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|
--[[ Lua 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
_draw.circle
_draw.circle_filled
_draw.ellipse
_draw.ellipse_filled
_draw.ellipse_rect_filled
_draw.ellipse_rect
_draw.hline
_draw.image
_draw.line
_draw.polygon
_draw.polyline
_draw.rect
_draw.rect_filled
_draw.rounded_rect
_draw.rounded_rect_filled
_draw.vline
]]
--[[ bClip allows drawing out of bounds without raising an error it is slower
than having a correctly bounded figure, but can be helpful in some cases..
]]
if not rb.lcd_framebuffer then rb.splash(rb.HZ, "No Support!") return nil end
local _draw = {} do
local rocklib_image = getmetatable(rb.lcd_framebuffer())
setmetatable(_draw, rocklib_image)
-- Internal Constants
local BSAND = 8 -- blits color to dst if src <> 0
local _NIL = nil -- nil placeholder
local _clear = rocklib_image.clear
local _copy = rocklib_image.copy
local _ellipse = rocklib_image.ellipse
local _get = rocklib_image.get
local _line = rocklib_image.line
local _min = math.min
local _newimg = rb.new_image
-- line
_draw.line = function(img, x1, y1, x2, y2, color, bClip)
_line(img, x1, y1, x2, y2, color, bClip)
end
-- horizontal line; x, y define start point; length in horizontal direction
local function hline(img, x, y , length, color, bClip)
_line(img, x, y, x + length, _NIL, color, bClip)
end
-- vertical line; x, y define start point; length in vertical direction
local function vline(img, x, y , length, color, bClip)
_line(img, x, y, _NIL, y + length, color, bClip)
end
-- draws a non-filled rect based on points in t-points
local function polyrect(img, x, y, t_points, color, bClip)
local pt_first_last = t_points[1]
local pt1, pt2
for i = 1, 4, 1 do
pt1 = t_points[i]
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
-- rectangle
local function rect(img, x, y, width, height, color, bClip)
if width == 0 or height == 0 then return end
polyrect(img, x, y, {{0, 0}, {width, 0}, {width, height}, {0, height}}, color, bClip)
end
-- filled rect, fillcolor is color if left empty
_draw.rect_filled = function(img, x, y, width, height, color, fillcolor, bClip)
if width == 0 or height == 0 then return end
if not fillcolor then
_clear(img, color, x, y, x + width, y + height, bClip)
else
_clear(img, fillcolor, x, y, x + width, y + height, bClip)
rect(img, x, y, width, height, color, bClip)
end
end
-- circle cx,cy define center point
_draw.circle = function(img, cx, cy, radius, color, bClip)
local r = radius
_ellipse(img, cx - r, cy - r, cx + r, cy + r, color, _NIL, bClip)
end
-- filled circle cx,cy define center, fillcolor is color if left empty
_draw.circle_filled = function(img, cx, cy, radius, color, fillcolor, bClip)
fillcolor = fillcolor or color
local r = radius
_ellipse(img, cx - r, cy - r, cx + r, cy + r, color, fillcolor, bClip)
end
-- ellipse that fits into defined rect
_draw.ellipse_rect = function(img, x1, y1, x2, y2, color, bClip)
_ellipse(img, x1, y1, x2, y2, color, _NIL, bClip)
end
--ellipse that fits into defined rect, fillcolor is color if left empty
_draw.ellipse_rect_filled = function(img, x1, y1, x2, y2, color, fillcolor, bClip)
if not fillcolor then fillcolor = color end
_ellipse(img, x1, y1, x2, y2, color, fillcolor, bClip)
end
-- ellipse cx, cy define center point; a, b the major/minor axis
_draw.ellipse = function(img, cx, cy, a, b, color, bClip)
_ellipse(img, cx - a, cy - b, cx + a, cy + b, color, _NIL, bClip)
end
-- filled ellipse cx, cy define center point; a, b the major/minor axis
-- fillcolor is color if left empty
_draw.ellipse_filled = function(img, cx, cy, a, b, color, fillcolor, bClip)
if not fillcolor then fillcolor = color end
_ellipse(img, cx - a, cy - b, cx + a, cy + b, color, fillcolor, bClip)
end
-- rounded rectangle
local function rounded_rect(img, x, y, w, h, radius, color, bClip)
local c_img
if w == 0 or h == 0 then return end
-- limit the radius of the circle otherwise it will overtake the rect
radius = _min(w / 2, radius)
radius = _min(h / 2, radius)
local r = radius
c_img = _newimg(r * 2 + 1, r * 2 + 1)
_clear(c_img, 0)
_ellipse(c_img, 1, 1, 1 + r + r, 1 + r + r, 0x1, _NIL, bClip)
-- copy 4 pieces of circle to their respective corners
_copy(img, c_img, x, y, _NIL, _NIL, r + 1, r + 1, bClip, BSAND, color) --TL
_copy(img, c_img, x + w - r - 2, y, r, _NIL, r + 1, r + 1, bClip, BSAND, color) --TR
_copy(img, c_img, x , y + h - r - 2, _NIL, r, r + 1, _NIL, bClip, BSAND, color) --BL
_copy(img, c_img, x + w - r - 2, y + h - r - 2, r, r, r + 1, r + 1, bClip, BSAND, color)--BR
c_img = _NIL
vline(img, x, y + r, h - r * 2, color, bClip);
vline(img, x + w - 1, y + r, h - r * 2, color, bClip);
hline(img, x + r, y, w - r * 2, color, bClip);
hline(img, x + r, y + h - 1, w - r * 2, color, bClip);
end
-- rounded rectangle fillcolor is color if left empty
_draw.rounded_rect_filled = function(img, x, y, w, h, radius, color, fillcolor, bClip)
local c_img
if w == 0 or h == 0 then return end
if not fillcolor then fillcolor = color end
-- limit the radius of the circle otherwise it will overtake the rect
radius = _min(w / 2, radius)
radius = _min(h / 2, radius)
local r = radius
c_img = _newimg(r * 2 + 1, r * 2 + 1)
_clear(c_img, 0)
_ellipse(c_img, 1, 1, 1 + r + r, 1 + r + r, 0x1, 0x1, bClip)
-- copy 4 pieces of circle to their respective corners
_copy(img, c_img, x, y, _NIL, _NIL, r + 1, r + 1, bClip, BSAND, fillcolor) --TL
_copy(img, c_img, x + w - r - 2, y, r, _NIL, r + 1, r + 1, bClip, BSAND, fillcolor) --TR
_copy(img, c_img, x, y + h - r - 2, _NIL, r, r + 1, _NIL, bClip, BSAND, fillcolor) --BL
_copy(img, c_img, x + w - r - 2, y + h - r - 2, r, r, r + 1, r + 1, bClip, BSAND, fillcolor) --BR
c_img = _NIL
-- finish filling areas circles didn't cover
_clear(img, fillcolor, x + r, y, x + w - r, y + h - 1, bClip)
_clear(img, fillcolor, x, y + r, x + r, y + h - r, bClip)
_clear(img, fillcolor, x + w - r, y + r, x + w - 1, y + h - r - 1, bClip)
if fillcolor ~= color then
rounded_rect(img, x, y, w, h, r, color, bClip)
end
end
-- draws an image at xy coord in dest image
_draw.image = function(dst, src, x, y, bClip)
if not src then --make sure an image was passed, otherwise bail
rb.splash(rb.HZ, "No Image!")
return _NIL
end
_copy(dst, src, x, y, 1, 1, _NIL, _NIL, bClip)
end
-- expose internal functions to the outside through _draw table
_draw.hline = hline
_draw.vline = vline
_draw.rect = rect
_draw.rounded_rect = rounded_rect
end -- _draw functions
return _draw
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