love2d 碰撞检测代码示例

function love.load()
  --初始化两个表，r1 r2
  r1 = {
        x = 10,
        y = 100,
        width = 100,
        height = 100
    }

    r2 = {
        x = 250,
        y = 120,
        width = 150,
        height = 120
    }
end
--创建碰撞检测函数
function checkCollision(a,b)
    local a_left = a.x
    local a_right = a.x + a.width
    local a_top = a.y
    local a_bottom = a.y + a.height

    local b_left = b.x
    local b_right = b.x + b.width
    local b_top = b.y
    local b_bottom = b.y + b.height
--当两个rectangle碰撞返回true,否则返回false
    if a_left<b_right and a_bottom>b_top and a_right>b_left and a_top<b_bottom then
        return true
    else
        return false
    end
    
end



function love.update(dt)
    r1.x = r1.x + 100 * dt
end



function love.draw()
    local mode
    if checkCollision(r1,r2) then
        mode = "fill"
    else
        mode = "line"
    end
    love.graphics.rectangle(mode,r1.x,r1.y,r1.width,r1.height)
    love.graphics.rectangle(mode,r2.x,r2.y,r2.width,r2.height)
end