forked from len0rd/rockbox
234 lines
8.3 KiB
Lua
234 lines
8.3 KiB
Lua
--[[ Lua 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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_draw.circle
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_draw.circle_filled
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_draw.ellipse
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_draw.ellipse_filled
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_draw.ellipse_rect_filled
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_draw.ellipse_rect
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_draw.hline
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_draw.image
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_draw.line
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_draw.polygon
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_draw.polyline
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_draw.rect
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_draw.rect_filled
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_draw.rounded_rect
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_draw.rounded_rect_filled
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_draw.vline
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]]
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--[[ bClip allows drawing out of bounds without raising an error it is slower
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than having a correctly bounded figure, but can be helpful in some cases..
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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 _draw = {} do
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local rocklib_image = getmetatable(rb.lcd_framebuffer())
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setmetatable(_draw, rocklib_image)
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-- Internal Constants
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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 _clear = rocklib_image.clear
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local _copy = rocklib_image.copy
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local _ellipse = rocklib_image.ellipse
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local _get = rocklib_image.get
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local _line = rocklib_image.line
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local _min = math.min
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local _newimg = rb.new_image
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-- line
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_draw.line = function(img, x1, y1, x2, y2, color, bClip)
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_line(img, x1, y1, x2, y2, color, bClip)
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end
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-- horizontal line; x, y define start point; length in horizontal direction
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local function hline(img, x, y , length, color, bClip)
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_line(img, x, y, x + length, _NIL, color, bClip)
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end
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-- vertical line; x, y define start point; length in vertical direction
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local function vline(img, x, y , length, color, bClip)
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_line(img, x, y, _NIL, y + length, color, bClip)
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end
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-- draws a non-filled rect based on points in t-points
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local function polyrect(img, x, y, t_points, color, bClip)
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local pt_first_last = t_points[1]
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local pt1, pt2
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for i = 1, 4, 1 do
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pt1 = t_points[i]
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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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-- rectangle
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local function rect(img, x, y, width, height, color, bClip)
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if width == 0 or height == 0 then return end
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polyrect(img, x, y, {{0, 0}, {width, 0}, {width, height}, {0, height}}, color, bClip)
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end
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-- filled rect, fillcolor is color if left empty
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_draw.rect_filled = function(img, x, y, width, height, color, fillcolor, bClip)
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if width == 0 or height == 0 then return end
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if not fillcolor then
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_clear(img, color, x, y, x + width, y + height, bClip)
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else
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_clear(img, fillcolor, x, y, x + width, y + height, bClip)
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rect(img, x, y, width, height, color, bClip)
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end
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end
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-- circle cx,cy define center point
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_draw.circle = function(img, cx, cy, radius, color, bClip)
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local r = radius
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_ellipse(img, cx - r, cy - r, cx + r, cy + r, color, _NIL, bClip)
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end
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-- filled circle cx,cy define center, fillcolor is color if left empty
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_draw.circle_filled = function(img, cx, cy, radius, color, fillcolor, bClip)
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fillcolor = fillcolor or color
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local r = radius
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_ellipse(img, cx - r, cy - r, cx + r, cy + r, color, fillcolor, bClip)
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end
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-- ellipse that fits into defined rect
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_draw.ellipse_rect = function(img, x1, y1, x2, y2, color, bClip)
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_ellipse(img, x1, y1, x2, y2, color, _NIL, bClip)
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end
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--ellipse that fits into defined rect, fillcolor is color if left empty
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_draw.ellipse_rect_filled = function(img, x1, y1, x2, y2, color, fillcolor, bClip)
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if not fillcolor then fillcolor = color end
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_ellipse(img, x1, y1, x2, y2, color, fillcolor, bClip)
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end
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-- ellipse cx, cy define center point; a, b the major/minor axis
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_draw.ellipse = function(img, cx, cy, a, b, color, bClip)
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_ellipse(img, cx - a, cy - b, cx + a, cy + b, color, _NIL, bClip)
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end
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-- filled ellipse cx, cy define center point; a, b the major/minor axis
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-- fillcolor is color if left empty
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_draw.ellipse_filled = function(img, cx, cy, a, b, color, fillcolor, bClip)
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if not fillcolor then fillcolor = color end
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_ellipse(img, cx - a, cy - b, cx + a, cy + b, color, fillcolor, bClip)
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end
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-- rounded rectangle
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local function rounded_rect(img, x, y, w, h, radius, color, bClip)
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local c_img
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if w == 0 or h == 0 then return end
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-- limit the radius of the circle otherwise it will overtake the rect
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radius = _min(w / 2, radius)
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radius = _min(h / 2, radius)
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local r = radius
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c_img = _newimg(r * 2 + 1, r * 2 + 1)
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_clear(c_img, 0)
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_ellipse(c_img, 1, 1, 1 + r + r, 1 + r + r, 0x1, _NIL, bClip)
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-- copy 4 pieces of circle to their respective corners
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_copy(img, c_img, x, y, _NIL, _NIL, r + 1, r + 1, bClip, BSAND, color) --TL
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_copy(img, c_img, x + w - r - 2, y, r, _NIL, r + 1, r + 1, bClip, BSAND, color) --TR
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_copy(img, c_img, x , y + h - r - 2, _NIL, r, r + 1, _NIL, bClip, BSAND, color) --BL
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_copy(img, c_img, x + w - r - 2, y + h - r - 2, r, r, r + 1, r + 1, bClip, BSAND, color)--BR
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c_img = _NIL
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vline(img, x, y + r, h - r * 2, color, bClip);
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vline(img, x + w - 1, y + r, h - r * 2, color, bClip);
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hline(img, x + r, y, w - r * 2, color, bClip);
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hline(img, x + r, y + h - 1, w - r * 2, color, bClip);
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end
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-- rounded rectangle fillcolor is color if left empty
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_draw.rounded_rect_filled = function(img, x, y, w, h, radius, color, fillcolor, bClip)
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local c_img
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if w == 0 or h == 0 then return end
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if not fillcolor then fillcolor = color end
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-- limit the radius of the circle otherwise it will overtake the rect
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radius = _min(w / 2, radius)
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radius = _min(h / 2, radius)
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local r = radius
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c_img = _newimg(r * 2 + 1, r * 2 + 1)
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_clear(c_img, 0)
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_ellipse(c_img, 1, 1, 1 + r + r, 1 + r + r, 0x1, 0x1, bClip)
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-- copy 4 pieces of circle to their respective corners
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_copy(img, c_img, x, y, _NIL, _NIL, r + 1, r + 1, bClip, BSAND, fillcolor) --TL
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_copy(img, c_img, x + w - r - 2, y, r, _NIL, r + 1, r + 1, bClip, BSAND, fillcolor) --TR
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_copy(img, c_img, x, y + h - r - 2, _NIL, r, r + 1, _NIL, bClip, BSAND, fillcolor) --BL
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_copy(img, c_img, x + w - r - 2, y + h - r - 2, r, r, r + 1, r + 1, bClip, BSAND, fillcolor) --BR
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c_img = _NIL
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-- finish filling areas circles didn't cover
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_clear(img, fillcolor, x + r, y, x + w - r, y + h - 1, bClip)
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_clear(img, fillcolor, x, y + r, x + r, y + h - r, bClip)
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_clear(img, fillcolor, x + w - r, y + r, x + w - 1, y + h - r - 1, bClip)
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if fillcolor ~= color then
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rounded_rect(img, x, y, w, h, r, color, bClip)
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end
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end
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-- draws an image at xy coord in dest image
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_draw.image = function(dst, src, x, y, bClip)
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if not src then --make sure an image was passed, otherwise bail
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rb.splash(rb.HZ, "No Image!")
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return _NIL
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end
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_copy(dst, src, x, y, 1, 1, _NIL, _NIL, bClip)
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end
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-- expose internal functions to the outside through _draw table
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_draw.hline = hline
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_draw.vline = vline
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_draw.rect = rect
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_draw.rounded_rect = rounded_rect
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end -- _draw functions
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return _draw
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