followCamera.js

followCamera.js

    calculatePlayerStats: function() {
      this.player = ig.game.getEntityByName('player');
      // Did we actually get a player?
      if (this.player) {
        // Cache some stats.
        this.halfPlayerWidth = this.player.size.x / 2;
        this.halfPlayerHeight = this.player.size.y / 2;
        this.maxVel = this.player.maxVel;
      }
    },

    update: function() {
      this.parent();

      ig.game.screen.x = this.pos.x;
      ig.game.screen.y = this.pos.y;

      if (!this.player) {
        this.calculatePlayerStats();
      }
      // If we actually got a player, then start tracking.
      if (this.player && this.player.alive) {
        var currentX = this.pos.x;
        var currentY = this.pos.y;
        var targetX = this.player.pos.x - this.halfScreenWidth + this.halfPlayerWidth;
        var targetY = this.player.pos.y - this.halfScreenHeight + this.halfPlayerHeight;
        this.pos.x = Math.round(currentX + (targetX - currentX) * ACCEL_FACTOR);
        this.pos.y = Math.round(currentY + (targetY - currentY) * ACCEL_FACTOR);
      } else {
        this.player = null;
      }
    }