Pong example, type named fields and vector lib changes.

examples/pong_vec/main.lua

@@ -0,0 +1,130 @@
+-- Pong example using Vector2 library.
+
+package.path = package.path..";"..RL_GetBasePath().."../resources/lib/?.lua"
+
+Vec2 = require "vector2"
+
+-- Settings.
+local winSize = Vec2:new( 800, 600 )
+local monitor = 0
+
+-- Constants.
+local PLAYER_SPEED = 300
+local BALL_SPEED = 330
+
+-- Game objects.
+local playerLeft = {
+	pos = Vec2:new( 0, 0 ),
+	size = Vec2:new( 10, 70 ),
+	score = 0,
+}
+local playerRight = {
+	pos = Vec2:new( 0, 0 ),
+	size = Vec2:new( 10, 70 ),
+	score = 0,
+}
+local ball = {
+	pos = Vec2:new( 0, 0 ),
+	radius = 8.0,
+	vel = Vec2:new( 0, 0 ),
+}
+
+local function reset()
+	-- Initialize player positions.
+	playerLeft.pos.x = playerLeft.size.x
+	playerLeft.pos.y = winSize.y / 2 - playerLeft.size.y / 2
+	
+	playerRight.pos.x = winSize.x - playerRight.size.x * 2
+	playerRight.pos.y = winSize.y / 2 - playerRight.size.y / 2
+
+	-- Set ball to center.
+	ball.pos:set( winSize.x / 2, winSize.y / 2 )
+	-- Short for if math random result 1, set BALL_SPEED otherwise set -BALL_SPEED.
+	ball.vel.x = math.random( 0, 1 ) == 1 and BALL_SPEED or -BALL_SPEED
+	-- Start slow.
+	ball.vel.y = 0
+end
+
+local function ballHit( padPos, padSize )
+	ball.vel.x = -ball.vel.x
+
+	local padCenter = padPos.y + padSize.y / 2
+	local relHitPos = ball.pos.y - padCenter
+	ball.vel.y = BALL_SPEED * relHitPos / padSize.y * 2
+end
+
+function init()
+	-- Set window to center of monitor.
+	local mPos = Vec2:new( RL_GetMonitorPosition( monitor ) )
+	local mSize = Vec2:new( RL_GetMonitorSize( monitor ) )
+
+	RL_SetWindowSize( winSize )
+	RL_SetWindowPosition( { mPos.x + mSize.x / 2 - winSize.x / 2, mPos.y + mSize.y / 2 - winSize.y / 2 } )
+	RL_SetWindowTitle( "Pong" )
+
+	-- Initialize ball pos.
+	math.randomseed( os.time() )
+	reset()
+end
+
+function process( delta )
+	-- Left player controls.
+	if RL_IsKeyDown( string.byte( "W" ) ) and 0 < playerLeft.pos.y then
+		playerLeft.pos.y = playerLeft.pos.y - PLAYER_SPEED * delta
+	elseif RL_IsKeyDown( string.byte( "S" ) ) and playerLeft.pos.y + playerLeft.size.y < winSize.y then
+		playerLeft.pos.y = playerLeft.pos.y + PLAYER_SPEED * delta
+	end
+
+	-- Right player controls.
+	if RL_IsKeyDown( KEY_UP ) and 0 < playerRight.pos.y then
+		playerRight.pos.y = playerRight.pos.y - PLAYER_SPEED * delta
+	elseif RL_IsKeyDown( KEY_DOWN ) and playerRight.pos.y + playerRight.size.y < winSize.y then
+		playerRight.pos.y = playerRight.pos.y + PLAYER_SPEED * delta
+	end
+
+	-- Move ball.
+	ball.pos = ball.pos + ball.vel:scale( delta )
+
+	-- Bounce from window edge.
+	if ( ball.pos.y < ball.radius and ball.vel.y < 0 )
+	or ( winSize.y < ball.pos.y + ball.radius and 0 < ball.vel.y ) then
+		ball.vel.y = -ball.vel.y
+	end
+
+	-- Bounce from players.
+	local playerLeftRect = { playerLeft.pos.x, playerLeft.pos.y,
+							 playerLeft.size.x, playerLeft.size.y }
+	local playerRightRect = { playerRight.pos.x, playerRight.pos.y,
+							  playerRight.size.x, playerRight.size.y }
+
+	if RL_CheckCollisionCircleRec( ball.pos, ball.radius, playerLeftRect ) and ball.vel.x < 0 then
+		ballHit( playerLeft.pos, playerLeft.size )
+	elseif RL_CheckCollisionCircleRec( ball.pos, ball.radius, playerRightRect ) and 0 < ball.vel.x then
+		ballHit( playerRight.pos, playerRight.size )
+	end
+
+	-- Score.
+	if ball.pos.x < 0 then
+		playerRight.score = playerRight.score + 1
+		reset()
+	elseif winSize.x < ball.pos.x then
+		playerLeft.score = playerLeft.score + 1
+		reset()
+	end
+end
+
+function draw()
+	RL_ClearBackground( BLACK )
+
+	-- Draw players.
+	RL_DrawRectangle( { playerLeft.pos.x, playerLeft.pos.y, playerLeft.size.x, playerLeft.size.y }, WHITE )
+	RL_DrawRectangle( { playerRight.pos.x, playerRight.pos.y, playerRight.size.x, playerRight.size.y }, WHITE )
+
+	-- Draw ball. Ball position will be the center in drawCircle.
+	RL_DrawCircle( ball.pos, ball.radius, WHITE )
+
+	-- Draw scire
+    RL_DrawText( 0, playerLeft.score, { 50, 10 }, 40, 2, WHITE )
+	local rightTextSize = Vec2:new( RL_MeasureText( 0, playerRight.score, 40, 2 ) )
+    RL_DrawText( 0, playerRight.score, { winSize.x - 50 - rightTextSize.x, 10 }, 40, 2, WHITE )
+end