Difference between revisions of "love.graphics.polygon"
(→Draw rotated triangle) |
(→Draw rotated triangle) |
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love.graphics.polygon(mode, -length/2, -width /2, -length/2, width /2, length/2, 0) | love.graphics.polygon(mode, -length/2, -width /2, -length/2, width /2, length/2, 0) | ||
love.graphics.pop() | love.graphics.pop() | ||
+ | end | ||
+ | </source> | ||
+ | |||
+ | |||
+ | === Pixel-perfect [https://en.wikipedia.org/wiki/Hexadecagon Hexadecagon] === | ||
+ | For better result it can be used with "rough" line style and "nearest" canvas filter. | ||
+ | <source lang="lua"> | ||
+ | function hexadecagon (mode, x, y, radius) -- same as [[love.graphics.circle|circle]] | ||
+ | local w1, w2 = math.atan(0.21), math.atan(0.72) -- magic values | ||
+ | local a = radius | ||
+ | local b = radius*math.sin (w1) | ||
+ | local c = radius*math.cos (w2) | ||
+ | local d = radius*math.sin (w2) | ||
+ | local vertices = { | ||
+ | a, b, c, d, d, c, b, a, | ||
+ | -b, a, -d, c, -c, d, -a, b, | ||
+ | -a,-b, -c,-d, -d,-c, -b,-a, | ||
+ | b,-a, d,-c, c,-d, a,-b} | ||
+ | love.graphics.translate (x+0.5, y+0.5) | ||
+ | love.graphics.polygon (mode, vertices) | ||
+ | love.graphics.translate (-x-0.5, -y-0.5) | ||
+ | end | ||
+ | |||
+ | canvas = love.graphics.newCanvas(width, height) | ||
+ | canvas:setFilter("nearest", "nearest") | ||
+ | love.graphics.setLineStyle("rough") | ||
+ | love.graphics.setCanvas (canvas) | ||
+ | love.graphics.setColor (0,1,0) | ||
+ | hexadecagon ("line", 200, 100, 60) | ||
+ | love.graphics.setCanvas () | ||
+ | |||
+ | function love.draw() | ||
+ | love.graphics.setColor (1,1,1) | ||
+ | love.graphics.draw (canvas) | ||
end | end | ||
</source> | </source> |
Revision as of 10:26, 14 June 2022
Available since LÖVE 0.4.0 |
This function is not supported in earlier versions. |
Draw a polygon.
Following the mode argument, this function can accept multiple numeric arguments or a single table of numeric arguments. In either case the arguments are interpreted as alternating x and y coordinates of the polygon's vertices.
When in fill mode, the polygon must be convex and simple or rendering artifacts may occur. love.math.triangulate and love.math.isConvex can be used in 0.9.0+. |
Contents
Function
Synopsis
love.graphics.polygon( mode, ... )
Arguments
Returns
Nothing.
Function
Synopsis
love.graphics.polygon( mode, vertices )
Arguments
Returns
Nothing.
Examples
Two ways of drawing the same triangle
This example shows how to give the coordinates explicitly and how to pass a table argument.
-- Giving the coordinates directly.
love.graphics.polygon("fill", 100,100, 200,100, 150,200)
-- Defining a table with the coordinates.
-- This table could be built incrementally too.
local vertices = {100,100, 200,100, 150,200}
-- Passing the table to the function as a second argument.
love.graphics.polygon("fill", vertices)
Draw concave polygon
local vertices = {100,100, 200,100, 200,200, 300,200, 300,300, 100,300} -- Concave "L" shape.
local triangles = love.math.triangulate(vertices)
for i, triangle in ipairs(triangles) do
love.graphics.polygon("fill", triangle)
end
Draw rotated rectangle
This is one way to draw a rotated rectangle.
function drawRotatedRectangle(mode, x, y, width, height, angle)
local cosa, sina = math.cos(angle), math.sin(angle)
local dx1, dy1 = width*cosa, width*sina
local dx2, dy2 = -height*sina, height*cosa
local px1, py1 = x, y
local px2, py2 = x+dx1, y+dy1
local px3, py3 = x+dx1+dx2, y+dy1+dy2
local px4, py4 = x+dx2, y+dy2
love.graphics.polygon(mode, px1,py1, px2,py2, px3,py3, px4,py4)
end
Draw rotated triangle
function drawTriangle (mode, x, y, length, width , angle) -- position, length, width and angle
love.graphics.push()
love.graphics.translate(x, y)
love.graphics.rotate( angle )
love.graphics.polygon(mode, -length/2, -width /2, -length/2, width /2, length/2, 0)
love.graphics.pop()
end
Pixel-perfect Hexadecagon
For better result it can be used with "rough" line style and "nearest" canvas filter.
function hexadecagon (mode, x, y, radius) -- same as [[love.graphics.circle|circle]]
local w1, w2 = math.atan(0.21), math.atan(0.72) -- magic values
local a = radius
local b = radius*math.sin (w1)
local c = radius*math.cos (w2)
local d = radius*math.sin (w2)
local vertices = {
a, b, c, d, d, c, b, a,
-b, a, -d, c, -c, d, -a, b,
-a,-b, -c,-d, -d,-c, -b,-a,
b,-a, d,-c, c,-d, a,-b}
love.graphics.translate (x+0.5, y+0.5)
love.graphics.polygon (mode, vertices)
love.graphics.translate (-x-0.5, -y-0.5)
end
canvas = love.graphics.newCanvas(width, height)
canvas:setFilter("nearest", "nearest")
love.graphics.setLineStyle("rough")
love.graphics.setCanvas (canvas)
love.graphics.setColor (0,1,0)
hexadecagon ("line", 200, 100, 60)
love.graphics.setCanvas ()
function love.draw()
love.graphics.setColor (1,1,1)
love.graphics.draw (canvas)
end
See Also
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