116 : Adding transforms

Balthazar:

Put these before the draw() function:

function start_level(level_id) { ... }

function set_transform(ctx, obj) {

var x = obj.x - obj.origin_x;

var y = obj.y - obj.origin_y;

// Adjust origin if we're facing left.

if (obj.dir < 0)

x += obj.width;

// Translate origin to (x,y).

ctx.setTransform(1, 0, 0, 1, x, y);

// Flip the image if we're facing left.

if (obj.dir < 0)

ctx.scale(-1, 1);

}

function reset_transform(ctx) {

// Reset transform to the identity matrix.

ctx.setTransform(1, 0, 0, 1, 0, 0);

}

Balthazar:

keep track of the current direction for players and monsters

function init_player() { ... _player.platform = null;

_player.dir = 1; ... }