Function place

code3/gmane/d3.layout.cloud.js:82–130

(board, tag, bounds)

    };

    function place(board, tag, bounds) {
      var perimeter = [{x: 0, y: 0}, {x: size[0], y: size[1]}],
          startX = tag.x,
          startY = tag.y,
          maxDelta = Math.sqrt(size[0] * size[0] + size[1] * size[1]),
          s = spiral(size),
          dt = Math.random() < .5 ? 1 : -1,
          t = -dt,
          dxdy,
          dx,
          dy;

      while (dxdy = s(t += dt)) {
        dx = ~~dxdy[0];
        dy = ~~dxdy[1];

        if (Math.min(dx, dy) > maxDelta) break;

        tag.x = startX + dx;
        tag.y = startY + dy;

        if (tag.x + tag.x0 < 0 || tag.y + tag.y0 < 0 ||
            tag.x + tag.x1 > size[0] || tag.y + tag.y1 > size[1]) continue;
        // TODO only check for collisions within current bounds.
        if (!bounds || !cloudCollide(tag, board, size[0])) {
          if (!bounds || collideRects(tag, bounds)) {
            var sprite = tag.sprite,
                w = tag.width >> 5,
                sw = size[0] >> 5,
                lx = tag.x - (w << 4),
                sx = lx & 0x7f,
                msx = 32 - sx,
                h = tag.y1 - tag.y0,
                x = (tag.y + tag.y0) * sw + (lx >> 5),
                last;
            for (var j = 0; j < h; j++) {
              last = 0;
              for (var i = 0; i <= w; i++) {
                board[x + i] |= (last << msx) | (i < w ? (last = sprite[j * w + i]) >>> sx : 0);
              }
              x += sw;
            }
            delete tag.sprite;
            return true;
          }
        }
      }
      return false;
    }

    cloud.words = function(x) {
      if (!arguments.length) return words;