local triangle = {}
triangle.origine = { x = 200, y = 200 }

triangle.points = { triangle.origine.x - 50, triangle.origine.y - 50, triangle.origine.x + 50, triangle.origine.y - 50, triangle.origine.x, triangle.origine.y + 50 }

local mouse = {x=0,y=0}

function love.load()
    love.mouse.setVisible(false)
end

function collide(triangle,mx,my)
    local zone1 = math.abs( ( triangle.points[1] - mx ) * ( triangle.points[4] - my ) - ( triangle.points[3] - mx ) * ( triangle.points[2] - my ) )
    local zone2 = math.abs( ( triangle.points[3] - mx ) * ( triangle.points[6] - my ) - ( triangle.points[5] - mx ) * ( triangle.points[4] - my ) )
    local zone3 = math.abs( ( triangle.points[5] - mx ) * ( triangle.points[2] - my ) - ( triangle.points[1] - mx ) * ( triangle.points[6] - my ) )

    if ( zone1 + zone2 + zone3 ) == math.abs( ( triangle.points[3] - triangle.points[1] ) * ( triangle.points[6] - triangle.points[2] ) - ( triangle.points[5] - triangle.points[1] ) * ( triangle.points[4] - triangle.points[2] ) ) then
        return true
    end

    return false
end

function love.draw()
    love.graphics.setColor(triangle.color)
    love.graphics.polygon("fill", triangle.points)

    love.graphics.setColor(1,1,0)
    love.graphics.circle("fill",mouse.x,mouse.y,4)

    love.graphics.setColor(1,1,1)
    love.graphics.print( mouse.x .. ':' .. mouse.y , 10, 10)
end

function love.update(dt)
    mouse.x, mouse.y = love.mouse.getPosition()

    if collide(triangle, mouse.x, mouse.y) then triangle.color = { 1,0,0 }
    else triangle.color = {.5, .5, .5} end
end

function love.keypressed(key)
    if key == "escape" then love.event.quit() end
end