78 lines
2.2 KiB
Java
78 lines
2.2 KiB
Java
var separateTree = require('./separate-root');
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var VALID_DIRECTIONS = ['LR', // left to right
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'RL', // right to left
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'TB', // top to bottom
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'BT', // bottom to top
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'H', // horizontal
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'V' // vertical
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];
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var HORIZONTAL_DIRECTIONS = ['LR', 'RL', 'H'];
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var isHorizontal = function isHorizontal(direction) {
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return HORIZONTAL_DIRECTIONS.indexOf(direction) > -1;
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};
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var DEFAULT_DIRECTION = VALID_DIRECTIONS[0];
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module.exports = function (root, options, layoutAlgrithm) {
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var direction = options.direction || DEFAULT_DIRECTION;
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options.isHorizontal = isHorizontal(direction);
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if (direction && VALID_DIRECTIONS.indexOf(direction) === -1) {
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throw new TypeError("Invalid direction: " + direction);
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}
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if (direction === VALID_DIRECTIONS[0]) {
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// LR
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layoutAlgrithm(root, options);
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} else if (direction === VALID_DIRECTIONS[1]) {
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// RL
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layoutAlgrithm(root, options);
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root.right2left();
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} else if (direction === VALID_DIRECTIONS[2]) {
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// TB
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layoutAlgrithm(root, options);
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} else if (direction === VALID_DIRECTIONS[3]) {
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// BT
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layoutAlgrithm(root, options);
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root.bottom2top();
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} else if (direction === VALID_DIRECTIONS[4] || direction === VALID_DIRECTIONS[5]) {
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// H or V
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// separate into left and right trees
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var _separateTree = separateTree(root, options),
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left = _separateTree.left,
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right = _separateTree.right; // do layout for left and right trees
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layoutAlgrithm(left, options);
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layoutAlgrithm(right, options);
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options.isHorizontal ? left.right2left() : left.bottom2top(); // combine left and right trees
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right.translate(left.x - right.x, left.y - right.y); // translate root
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root.x = left.x;
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root.y = right.y;
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var bb = root.getBoundingBox();
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if (options.isHorizontal) {
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if (bb.top < 0) {
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root.translate(0, -bb.top);
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}
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} else {
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if (bb.left < 0) {
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root.translate(-bb.left, 0);
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}
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}
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} // fixed root position, default value is true
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var fixedRoot = options.fixedRoot;
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if (fixedRoot === undefined) fixedRoot = true;
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if (fixedRoot) {
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root.translate(-(root.x + root.width / 2 + root.hgap), -(root.y + root.height / 2 + root.vgap));
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}
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return root;
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}; |