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--
-- Agario Checkers - Checkers-like game with inspiration from agar.io
-- Copyright (C) 2015-2016 Delwink, LLC
--
-- Redistributions, modified or unmodified, in whole or in part, must retain
-- applicable copyright or other legal privilege notices, these conditions, and
-- the following license terms and disclaimer. Subject to these conditions,
-- the holder(s) of copyright or other legal privileges, author(s) or
-- assembler(s), and contributors of this work hereby grant to any person who
-- obtains a copy of this work in any form:
--
-- 1. Permission to reproduce, modify, distribute, publish, sell, sublicense,
-- use, and/or otherwise deal in the licensed material without restriction.
--
-- 2. A perpetual, worldwide, non-exclusive, royalty-free, irrevocable patent
-- license to reproduce, modify, distribute, publish, sell, use, and/or
-- otherwise deal in the licensed material without restriction, for any and all
-- patents:
--
-- a. Held by each such holder of copyright or other legal privilege,
-- author or assembler, or contributor, necessarily infringed by the
-- contributions alone or by combination with the work, of that privilege
-- holder, author or assembler, or contributor.
--
-- b. Necessarily infringed by the work at the time that holder of
-- copyright or other privilege, author or assembler, or contributor made
-- any contribution to the work.
--
-- NO WARRANTY OF ANY KIND IS IMPLIED BY, OR SHOULD BE INFERRED FROM, THIS
-- LICENSE OR THE ACT OF DISTRIBUTION UNDER THE TERMS OF THIS LICENSE,
-- INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR
-- A PARTICULAR PURPOSE, AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS,
-- ASSEMBLERS, OR HOLDERS OF COPYRIGHT OR OTHER LEGAL PRIVILEGE BE LIABLE FOR
-- ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER IN ACTION OF CONTRACT, TORT,
-- OR OTHERWISE ARISING FROM, OUT OF, OR IN CONNECTION WITH THE WORK OR THE USE
-- OF OR OTHER DEALINGS IN THE WORK.
--
local RIGHT_ANGLE = math.pi / 2
local DEG45 = math.pi / 4
function drawbox(x, y, w, h)
love.graphics.setLineWidth(3)
love.graphics.line(
x, y,
x + w, y,
x + w, y + h,
x, y + h,
x, y
)
love.graphics.setLineWidth(1)
end
function getquadrant(deltax, deltay)
if deltax > 0 then
if deltay > 0 then
return 1
else
return 4
end
else
if deltay > 0 then
return 2
else
return 3
end
end
end
function getangle(x1, y1, x2, y2)
local deltax = x2 - x1
local deltay = y2 - y1
if 0 == deltax then
if deltay < 0 then
return RIGHT_ANGLE
else
return 3 * RIGHT_ANGLE
end
elseif 0 == deltay then
if deltax < 0 then
return 2 * RIGHT_ANGLE
else
return 0
end
end
local angle = -math.abs(math.atan(deltay / deltax))
local quad = getquadrant(deltax, deltay)
if 2 == quad then
angle = math.pi - angle
elseif 3 == quad then
angle = math.pi + angle
elseif 4 == quad then
angle = -angle
end
while angle < 0 do
angle = angle + (2 * math.pi)
end
return angle
end
function drawlineangle(x, y, length, angle)
local change = angle + RIGHT_ANGLE -- use real angles
love.graphics.setLineWidth(3)
love.graphics.translate(x, y)
love.graphics.rotate(-change)
love.graphics.line(0, 0, 0, length)
love.graphics.rotate(change)
love.graphics.translate(-x, -y)
love.graphics.setLineWidth(1)
end
function drawarrow(x1, y1, x2, y2)
local angle = getangle(x1, y1, x2, y2)
love.graphics.setLineWidth(3)
love.graphics.line(x1, y1, x2, y2)
love.graphics.setLineWidth(1)
local change = DEG45 * 3
drawlineangle(x2, y2, 5, angle - change)
drawlineangle(x2, y2, 5, angle + change)
end
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