100 lines
2.1 KiB
Lua
100 lines
2.1 KiB
Lua
-- Gist accompanying https://alloca.space/blog/lua-lang.html
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--
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-- Build and Run
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-- -------------
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--
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-- 1. Install https://love2d.org on your system
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--
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-- 2. Run with:
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--
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-- love .
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-- Constants
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SCREEN_WIDTH = 640
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SCREEN_HEIGHT = 480
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BALL_SPEED = 200
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BALL_RADIUS = 50
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-- Objects
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local background = {
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["color"] = {
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["r"] = 0x08 / 255,
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["g"] = 0x18 / 255,
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["b"] = 0x29 / 255,
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}
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}
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local ball = {
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position = {
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["x"] = SCREEN_WIDTH/3,
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["y"] = SCREEN_HEIGHT/3,
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},
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direction = {
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["x"] = 1,
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["y"] = 1,
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},
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color = {
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["r"] = 0xf9 / 255,
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["g"] = 0x92 / 255,
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["b"] = 0x26 / 255,
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},
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["radius"] = BALL_RADIUS,
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}
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-- Main
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function love.load()
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love.window.setMode(SCREEN_WIDTH, SCREEN_HEIGHT, {vsync=true,msaa=4})
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end
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function love.update()
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updateBall(ball)
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end
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function love.draw()
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love.graphics.clear(background.color.r, background.color.g, background.color.b, 255, true, true)
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love.graphics.setColor(ball.color.r, ball.color.g, ball.color.b)
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love.graphics.circle("fill", ball.position.x, ball.position.y, ball.radius)
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end
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-- Update
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function updateBall(ball)
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applyKeys(ball)
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swingBall(ball)
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end
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function applyKeys(ball)
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if love.keyboard.isDown("d") then ball.direction.x = 1 end
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if love.keyboard.isDown("a") then ball.direction.x = -1 end
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if love.keyboard.isDown("s") then ball.direction.y = 1 end
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if love.keyboard.isDown("w") then ball.direction.y = -1 end
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end
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function swingBall(ball)
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local p, d = swing(ball.position.x, ball.direction.x, 0 + ball.radius, SCREEN_WIDTH - ball.radius)
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ball.position.x = p
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ball.direction.x = d
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local p, d = swing(ball.position.y, ball.direction.y, 0 + ball.radius, SCREEN_HEIGHT - ball.radius)
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ball.position.y = p
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ball.direction.y = d
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end
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function swing(position, direction, min, max)
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if (position <= min) then
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position = min
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direction = 1
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elseif (position >= max) then
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position = max
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direction = -1
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end
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local dt = love.timer.getDelta()
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position = position + (direction * BALL_SPEED * dt)
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return position, direction
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end
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