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/*
format **the left to right** mind map
![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-mindmap-format-1.png)
# tree
Mind map is actually a tree, so you must have a **root node**. The script will determine **the leftmost element** of the selected element as the root element (node is excalidraw element, e.g. rectangle, diamond, ellipse, text, image, but it can't be arrow, line, freedraw, **group**)
The element connecting node and node must be an **arrow** and have the correct direction, e.g. **parent node -> children node**
# sort
The order of nodes in the Y axis or vertical direction is determined by **the creation time** of the arrow connecting it
![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-mindmap-format-2.png)
So if you want to readjust the order, you can **delete arrows and reconnect them**
# setting
Script provides options to adjust the style of mind map, The option is at the bottom of the option of the exalidraw plugin(e.g. Settings -> Community plugins -> Excalidraw -> drag to bottom)
# problem
1. since the start bingding and end bingding of the arrow are easily disconnected from the node, so if there are unformatted parts, please **check the connection** and use the script to **reformat**
```javascript
*/
let settings = ea.getScriptSettings();
//set default values on first run
if (!settings["MindMap Format"]) {
settings = {
"MindMap Format": {
value: "Excalidraw/MindMap Format",
description:
"This is prepared for the namespace of MindMap Format and does not need to be modified",
},
"default gap": {
value: 10,
description: "Interval size of element",
},
"curve length": {
value: 40,
description: "The length of the curve part in the mind map line",
},
"length between element and line": {
value: 50,
description:
"The distance between the tail of the connection and the connecting elements of the mind map",
},
};
ea.setScriptSettings(settings);
}
const sceneElements = ea.getExcalidrawAPI().getSceneElements();
// default X coordinate of the middle point of the arc
const defaultDotX = Number(settings["curve length"].value);
// The default length from the middle point of the arc on the X axis
const defaultLengthWithCenterDot = Number(
settings["length between element and line"].value
);
// Initial trimming distance of the end point on the Y axis
const initAdjLength = 4;
// default gap
const defaultGap = Number(settings["default gap"].value);
const setCenter = (parent, line) => {
// Focus and gap need the api calculation of excalidraw
// e.g. determineFocusDistance, but they are not available now
// so they are uniformly set to 0/1
line.startBinding.focus = 0;
line.startBinding.gap = 1;
line.endBinding.focus = 0;
line.endBinding.gap = 1;
line.x = parent.x + parent.width;
line.y = parent.y + parent.height / 2;
};
/**
* set the middle point of curve
* @param {any} lineEl the line element of excalidraw
* @param {number} height height of dot on Y axis
* @param {number} [ratio=1] ，coefficient of the initial trimming distance of the end point on the Y axis, default is 1
*/
const setTopCurveDotOnLine = (lineEl, height, ratio = 1) => {
if (lineEl.points.length < 3) {
lineEl.points.splice(1, 0, [defaultDotX, lineEl.points[0][1] - height]);
} else if (lineEl.points.length === 3) {
lineEl.points[1] = [defaultDotX, lineEl.points[0][1] - height];
} else {
lineEl.points.splice(2, lineEl.points.length - 3);
lineEl.points[1] = [defaultDotX, lineEl.points[0][1] - height];
}
lineEl.points[2][0] = lineEl.points[1][0] + defaultLengthWithCenterDot;
// adjust the curvature of the second line segment
lineEl.points[2][1] = lineEl.points[1][1] - initAdjLength * ratio * 0.8;
};
const setMidCurveDotOnLine = (lineEl) => {
if (lineEl.points.length < 3) {
lineEl.points.splice(1, 0, [defaultDotX, lineEl.points[0][1]]);
} else if (lineEl.points.length === 3) {
lineEl.points[1] = [defaultDotX, lineEl.points[0][1]];
} else {
lineEl.points.splice(2, lineEl.points.length - 3);
lineEl.points[1] = [defaultDotX, lineEl.points[0][1]];
}
lineEl.points[2][0] = lineEl.points[1][0] + defaultLengthWithCenterDot;
lineEl.points[2][1] = lineEl.points[1][1];
};
/**
* set the middle point of curve
* @param {any} lineEl the line element of excalidraw
* @param {number} height height of dot on Y axis
* @param {number} [ratio=1] ，coefficient of the initial trimming distance of the end point on the Y axis, default is 1
*/
const setBottomCurveDotOnLine = (lineEl, height, ratio = 1) => {
if (lineEl.points.length < 3) {
lineEl.points.splice(1, 0, [defaultDotX, lineEl.points[0][1] + height]);
} else if (lineEl.points.length === 3) {
lineEl.points[1] = [defaultDotX, lineEl.points[0][1] + height];
} else {
lineEl.points.splice(2, lineEl.points.length - 3);
lineEl.points[1] = [defaultDotX, lineEl.points[0][1] + height];
}
lineEl.points[2][0] = lineEl.points[1][0] + defaultLengthWithCenterDot;
// adjust the curvature of the second line segment
lineEl.points[2][1] = lineEl.points[1][1] + initAdjLength * ratio * 0.8;
};
const setTextXY = (rect, text) => {
text.x = rect.x + (rect.width - text.width) / 2;
text.y = rect.y + (rect.height - text.height) / 2;
};
const setChildrenXY = (parent, children, line, elementsMap) => {
x = parent.x + parent.width + line.points[2][0];
y = parent.y + parent.height / 2 + line.points[2][1] - children.height / 2;
distX = children.x - x;
distY = children.y - y;
ea.getElementsInTheSameGroupWithElement(children, sceneElements).forEach((el) => {
el.x = el.x - distX;
el.y = el.y - distY;
});
if (
["rectangle", "diamond", "ellipse"].includes(children.type) &&
![null, undefined].includes(children.boundElements)
) {
const textDesc = children.boundElements.filter(
(el) => el.type === "text"
)[0];
if (textDesc !== undefined) {
const textEl = elementsMap.get(textDesc.id);
setTextXY(children, textEl);
}
}
};
/**
* returns the height of the upper part of all child nodes
* and the height of the lower part of all child nodes
* @param {Number[]} childrenTotalHeightArr
* @returns {Number[]} [topHeight, bottomHeight]
*/
const getNodeCurrentHeight = (childrenTotalHeightArr) => {
if (childrenTotalHeightArr.length <= 0) return [0, 0];
else if (childrenTotalHeightArr.length === 1)
return [childrenTotalHeightArr[0] / 2, childrenTotalHeightArr[0] / 2];
const heightArr = childrenTotalHeightArr;
let topHeight = 0,
bottomHeight = 0;
const isEven = heightArr.length % 2 === 0;
const mid = Math.floor(heightArr.length / 2);
const topI = mid - 1;
const bottomI = isEven ? mid : mid + 1;
topHeight = isEven ? 0 : heightArr[mid] / 2;
for (let i = topI; i >= 0; i--) {
topHeight += heightArr[i];
}
bottomHeight = isEven ? 0 : heightArr[mid] / 2;
for (let i = bottomI; i < heightArr.length; i++) {
bottomHeight += heightArr[i];
}
return [topHeight, bottomHeight];
};
/**
* handle the height of each point in the single-level tree
* @param {Array} lines
* @param {Map} elementsMap
* @param {Boolean} isEven
* @param {Number} mid 'lines' array midpoint index
* @returns {Array} height array corresponding to 'lines'
*/
const handleDotYValue = (lines, elementsMap, isEven, mid) => {
const getTotalHeight = (line, elementsMap) => {
return elementsMap.get(line.endBinding.elementId).totalHeight;
};
const getTopHeight = (line, elementsMap) => {
return elementsMap.get(line.endBinding.elementId).topHeight;
};
const getBottomHeight = (line, elementsMap) => {
return elementsMap.get(line.endBinding.elementId).bottomHeight;
};
const heightArr = new Array(lines.length).fill(0);
const upI = mid === 0 ? 0 : mid - 1;
const bottomI = isEven ? mid : mid + 1;
let initHeight = isEven ? 0 : getTopHeight(lines[mid], elementsMap);
for (let i = upI; i >= 0; i--) {
heightArr[i] = initHeight + getBottomHeight(lines[i], elementsMap);
initHeight += getTotalHeight(lines[i], elementsMap);
}
initHeight = isEven ? 0 : getBottomHeight(lines[mid], elementsMap);
for (let i = bottomI; i < lines.length; i++) {
heightArr[i] = initHeight + getTopHeight(lines[i], elementsMap);
initHeight += getTotalHeight(lines[i], elementsMap);
}
return heightArr;
};
/**
* format single-level tree
* @param {any} parent
* @param {Array} lines
* @param {Map} childrenDescMap
* @param {Map} elementsMap
*/
const formatTree = (parent, lines, childrenDescMap, elementsMap) => {
lines.forEach((item) => setCenter(parent, item));
const isEven = lines.length % 2 === 0;
const mid = Math.floor(lines.length / 2);
const heightArr = handleDotYValue(lines, childrenDescMap, isEven, mid);
lines.forEach((item, index) => {
if (isEven) {
if (index < mid) setTopCurveDotOnLine(item, heightArr[index], index + 1);
else setBottomCurveDotOnLine(item, heightArr[index], index - mid + 1);
} else {
if (index < mid) setTopCurveDotOnLine(item, heightArr[index], index + 1);
else if (index === mid) setMidCurveDotOnLine(item);
else setBottomCurveDotOnLine(item, heightArr[index], index - mid);
}
});
lines.forEach((item) => {
if (item.endBinding !== null) {
setChildrenXY(
parent,
elementsMap.get(item.endBinding.elementId),
item,
elementsMap
);
}
});
};
const generateTree = (elements) => {
const elIdMap = new Map([[elements[0].id, elements[0]]]);
let minXEl = elements[0];
for (let i = 1; i < elements.length; i++) {
elIdMap.set(elements[i].id, elements[i]);
if (
!(elements[i].type === "arrow" || elements[i].type === "line") &&
elements[i].x < minXEl.x
) {
minXEl = elements[i];
}
}
const root = {
el: minXEl,
totalHeight: minXEl.height,
topHeight: 0,
bottomHeight: 0,
linkChildrensLines: [],
isLeafNode: false,
children: [],
};
const preIdSet = new Set(); // The id_set of Elements that is already in the tree, avoid a dead cycle
const dfsForTreeData = (root) => {
if (preIdSet.has(root.el.id)) {
return 0;
}
preIdSet.add(root.el.id);
let lines = root.el.boundElements.filter(
(el) =>
el.type === "arrow" &&
!preIdSet.has(el.id) &&
elIdMap.get(el.id)?.startBinding?.elementId === root.el.id
);
if (lines.length === 0) {
root.isLeafNode = true;
root.totalHeight = root.el.height + 2 * defaultGap;
[root.topHeight, root.bottomHeight] = [
root.totalHeight / 2,
root.totalHeight / 2,
];
return root.totalHeight;
} else {
lines = lines.map((elementDesc) => {
preIdSet.add(elementDesc.id);
return elIdMap.get(elementDesc.id);
});
}
const linkChildrensLines = [];
lines.forEach((el) => {
const line = el;
if (
line &&
line.endBinding !== null &&
line.endBinding !== undefined &&
!preIdSet.has(elIdMap.get(line.endBinding.elementId).id)
) {
const children = elIdMap.get(line.endBinding.elementId);
linkChildrensLines.push(line);
root.children.push({
el: children,
totalHeight: 0,
topHeight: 0,
bottomHeight: 0,
linkChildrensLines: [],
isLeafNode: false,
children: [],
});
}
});
let totalHeight = 0;
root.children.forEach((el) => (totalHeight += dfsForTreeData(el)));
root.linkChildrensLines = linkChildrensLines;
if (root.children.length === 0) {
root.isLeafNode = true;
root.totalHeight = root.el.height + 2 * defaultGap;
[root.topHeight, root.bottomHeight] = [
root.totalHeight / 2,
root.totalHeight / 2,
];
} else if (root.children.length > 0) {
root.totalHeight = Math.max(root.el.height + 2 * defaultGap, totalHeight);
[root.topHeight, root.bottomHeight] = getNodeCurrentHeight(
root.children.map((item) => item.totalHeight)
);
}
return totalHeight;
};
dfsForTreeData(root);
const dfsForFormat = (root) => {
if (root.isLeafNode) return;
const childrenDescMap = new Map(
root.children.map((item) => [item.el.id, item])
);
formatTree(root.el, root.linkChildrensLines, childrenDescMap, elIdMap);
root.children.forEach((el) => dfsForFormat(el));
};
dfsForFormat(root);
};
const elements = ea.getViewSelectedElements();
generateTree(elements);
ea.copyViewElementsToEAforEditing(elements);
await ea.addElementsToView(false, false);