127 lines
3.8 KiB
Lua
127 lines
3.8 KiB
Lua
-- Settings.
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local winSize = { 800, 600 }
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local monitor = 0
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-- Constants.
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local PLAYER_SPEED = 300
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local BALL_SPEED = 330
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-- Game objects.
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local playerLeft = {
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pos = { 0, 0 },
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size = { 10, 70 },
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score = 0,
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}
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local playerRight = {
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pos = { 0, 0 },
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size = { 10, 70 },
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score = 0,
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}
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local ball = {
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pos = { 0, 0 },
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radius = 8.0,
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vel = { 0, 0 },
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}
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local function reset()
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-- Initialize player positions.
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playerLeft.pos[1] = playerLeft.size[1]
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playerLeft.pos[2] = winSize[2] / 2 - playerLeft.size[2] / 2
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playerRight.pos[1] = winSize[1] - playerRight.size[1] * 2
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playerRight.pos[2] = winSize[2] / 2 - playerRight.size[2] / 2
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-- Set ball to center.
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ball.pos = { winSize[1] / 2, winSize[2] / 2 }
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-- Short for if math random result 1, set BALL_SPEED otherwise set -BALL_SPEED.
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-- Could be replaced by normal if statement for easier readability.
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ball.vel[1] = math.random( 0, 1 ) == 1 and BALL_SPEED or -BALL_SPEED
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-- Start slow.
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ball.vel[2] = 0
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end
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local function ballHit( padPos, padSize )
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ball.vel[1] = -ball.vel[1]
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local padCenter = padPos[2] + padSize[2] / 2
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local relHitPos = ball.pos[2] - padCenter
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ball.vel[2] = BALL_SPEED * relHitPos / padSize[2] * 2
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end
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function init()
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-- Set window to center of monitor.
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local mPos = RL_GetMonitorPosition( monitor )
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local mSize = RL_GetMonitorSize( monitor )
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RL_SetWindowSize( winSize )
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RL_SetWindowPosition( { mPos[1] + mSize[1] / 2 - winSize[1] / 2, mPos[2] + mSize[2] / 2 - winSize[2] / 2 } )
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RL_SetWindowTitle( "Pong" )
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-- Initialize ball pos.
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math.randomseed( os.time() )
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reset()
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end
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function process( delta )
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-- Left player controls.
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if RL_IsKeyDown( string.byte( "W" ) ) and 0 < playerLeft.pos[2] then
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playerLeft.pos[2] = playerLeft.pos[2] - PLAYER_SPEED * delta
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elseif RL_IsKeyDown( string.byte( "S" ) ) and playerLeft.pos[2] + playerLeft.size[2] < winSize[2] then
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playerLeft.pos[2] = playerLeft.pos[2] + PLAYER_SPEED * delta
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end
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-- Right player controls.
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if RL_IsKeyDown( KEY_UP ) and 0 < playerRight.pos[2] then
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playerRight.pos[2] = playerRight.pos[2] - PLAYER_SPEED * delta
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elseif RL_IsKeyDown( KEY_DOWN ) and playerRight.pos[2] + playerRight.size[2] < winSize[2] then
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playerRight.pos[2] = playerRight.pos[2] + PLAYER_SPEED * delta
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end
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-- Move ball.
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ball.pos = { ball.pos[1] + ball.vel[1] * delta,
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ball.pos[2] + ball.vel[2] * delta }
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-- Bounce from window edge.
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if ( ball.pos[2] < ball.radius and ball.vel[2] < 0 )
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or ( winSize[2] < ball.pos[2] + ball.radius and 0 < ball.vel[2] ) then
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ball.vel[2] = -ball.vel[2]
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end
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-- Bounce from players.
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local playerLeftRect = { playerLeft.pos[1], playerLeft.pos[2],
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playerLeft.size[1], playerLeft.size[2] }
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local playerRightRect = { playerRight.pos[1], playerRight.pos[2],
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playerRight.size[1], playerRight.size[2] }
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if RL_CheckCollisionCircleRec( ball.pos, ball.radius, playerLeftRect ) and ball.vel[1] < 0 then
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ballHit( playerLeft.pos, playerLeft.size )
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elseif RL_CheckCollisionCircleRec( ball.pos, ball.radius, playerRightRect ) and 0 < ball.vel[1] then
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ballHit( playerRight.pos, playerRight.size )
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end
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-- Score.
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if ball.pos[1] < 0 then
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playerRight.score = playerRight.score + 1
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reset()
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elseif winSize[1] < ball.pos[1] then
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playerLeft.score = playerLeft.score + 1
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reset()
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end
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end
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function draw()
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RL_ClearBackground( BLACK )
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-- Draw players.
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RL_DrawRectangle( { playerLeft.pos[1], playerLeft.pos[2], playerLeft.size[1], playerLeft.size[2] }, WHITE )
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RL_DrawRectangle( { playerRight.pos[1], playerRight.pos[2], playerRight.size[1], playerRight.size[2] }, WHITE )
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-- Draw ball. Ball position will be the center in drawCircle.
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RL_DrawCircle( ball.pos, ball.radius, WHITE )
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-- Draw scire
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RL_DrawText( 0, playerLeft.score, { 50, 10 }, 40, 2, WHITE )
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local rightTextSize = RL_MeasureText( 0, playerRight.score, 40, 2 )
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RL_DrawText( 0, playerRight.score, { winSize[1] - 50 - rightTextSize[1], 10 }, 40, 2, WHITE )
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end
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