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linkManager.ts
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linkManager.ts
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import { ObsidianRenderer, ObsidianLink, LinkPair, GltLink, DataviewLinkType , GltLegendGraphic} from 'src/types';
import { getAPI } from 'obsidian-dataview';
import { Text, TextStyle , Graphics, Color} from 'pixi.js';
// @ts-ignore
import extractLinks from 'markdown-link-extractor';
export class LinkManager {
linksMap: Map<string, GltLink>;
api = getAPI();
currentTheme : string;
textColor : string;
tagColors: Map<string, GltLegendGraphic>;
categoricalColors: number[] = [
0xF44336, // Red
0x03A9F4, // Light Blue
0xFF9800, // Orange
0x9C27B0, // Purple
0xCDDC39, // Lime
0x3F51B5, // Indigo
0xFFC107, // Amber
0x00BCD4, // Cyan
0xE91E63, // Pink
0x4CAF50, // Green
0xFF5722, // Deep Orange
0x673AB7, // Deep Purple
0x9E9E9E, // Grey
0x2196F3, // Blue
0x8BC34A, // Light Green
0x795548, // Brown
0x009688, // Teal
0x607D8B, // Blue Grey
0xFFEB3B, // Yellow
0x000000 // Black for contrast
]
currentTagColorIndex = 0;
yOffset = 5; // To increment the y position for each legend item
xOffset = 20;
lineHeight = 17; // Height of each line in the legend
lineLength = 40; // Width of the color line
spaceBetweenTextAndLine = 1; // Space between the text and the start of the line
constructor() {
this.linksMap = new Map<string, GltLink>();
this.tagColors = new Map<string, GltLegendGraphic>();
// Detect changes to the theme.
this.detectThemeChange();
}
generateKey(sourceId: string, targetId: string): string {
return `${sourceId}-${targetId}`;
}
private detectThemeChange(): void {
let lastTheme = '';
let lastStyleSheetHref = '';
let debounceTimer: number;
const themeObserver = new MutationObserver(() => {
clearTimeout(debounceTimer);
debounceTimer = window.setTimeout(() => {
this.currentTheme = document.body.classList.contains('theme-dark') ? 'theme-dark' : 'theme-light';
const currentStyleSheetHref = document.querySelector('link[rel="stylesheet"][href*="theme"]')?.getAttribute('href');
if ((this.currentTheme && this.currentTheme !== lastTheme) || (currentStyleSheetHref !== lastStyleSheetHref)) {
this.textColor = this.getComputedColorFromClass(this.currentTheme, '--text-normal');
lastTheme = this.currentTheme;
if (currentStyleSheetHref) {
lastStyleSheetHref = currentStyleSheetHref;
}
}
}, 100); // Debounce delay
});
themeObserver.observe(document.body, { attributes: true, attributeFilter: ['class'] });
themeObserver.observe(document.head, { childList: true, subtree: true, attributes: true, attributeFilter: ['href'] });
}
private getComputedColorFromClass(className : string, cssVariable : string) : string {
// Create a temporary element
const tempElement = document.createElement('div');
// Apply the class to the temporary element
tempElement.classList.add(className);
document.body.appendChild(tempElement);
// Get the computed style of the temporary element
const style = getComputedStyle(tempElement);
const colorValue = style.getPropertyValue(cssVariable).trim();
// Remove the temporary element
document.body.removeChild(tempElement);
// Check if the color is in HSL format
if (colorValue.startsWith('hsl')) {
// Return a default color based on some condition, e.g., current theme
// This is a placeholder condition
return document.body.classList.contains('theme-dark') ? '#b3b3b3' : '#5c5c5c';
} else {
// If it's not HSL, return the color as-is
return colorValue;
}
}
addLink(renderer: ObsidianRenderer, obLink: ObsidianLink, tagColors: boolean, tagLegend: boolean): void {
const key = this.generateKey(obLink.source.id, obLink.target.id);
const reverseKey = this.generateKey(obLink.target.id, obLink.source.id);
const pairStatus = (obLink.source.id !== obLink.target.id) && this.linksMap.has(reverseKey) ? LinkPair.Second : LinkPair.None;
const newLink: GltLink = {
obsidianLink: obLink,
pairStatus: pairStatus,
pixiText: this.initializeLinkText(renderer, obLink, pairStatus),
pixiGraphics: tagColors ? this.initializeLinkGraphics(renderer, obLink, tagLegend) : null,
};
console.log(obLink);
this.linksMap.set(key, newLink);
if ((obLink.source.id !== obLink.target.id) && this.linksMap.has(reverseKey)) {
const reverseLink = this.linksMap.get(reverseKey);
if (reverseLink) {
reverseLink.pairStatus = LinkPair.First;
}
}
}
removeLink(renderer: ObsidianRenderer, link: ObsidianLink): void {
const key = this.generateKey(link.source.id, link.target.id);
const reverseKey = this.generateKey(link.target.id, link.source.id);
const gltLink = this.linksMap.get(key);
if (gltLink && gltLink.pixiText && renderer.px && renderer.px.stage && renderer.px.stage.children && renderer.px.stage.children.includes(gltLink.pixiText)) {
renderer.px.stage.removeChild(gltLink.pixiText);
gltLink.pixiText.destroy();
}
if (gltLink && gltLink.pixiGraphics && renderer.px && renderer.px.stage && renderer.px.stage.children && renderer.px.stage.children.includes(gltLink.pixiGraphics)) {
renderer.px.stage.removeChild(gltLink.pixiGraphics);
gltLink.pixiGraphics.destroy();
}
let colorKey = gltLink?.pixiText?.text?.replace(/\r?\n/g, "");
if (colorKey) {
if (this.tagColors.has(colorKey)) {
const legendGraphic = this.tagColors.get(colorKey);
if (legendGraphic) {
legendGraphic.nUsing -= 1;
if (legendGraphic.nUsing < 1) {
this.yOffset -= this.lineHeight;
this.currentTagColorIndex -= 1;
if (this.currentTagColorIndex < 0) this.currentTagColorIndex = this.categoricalColors.length - 1;
if (legendGraphic.legendText && renderer.px && renderer.px.stage && renderer.px.stage.children && renderer.px.stage.children.includes(legendGraphic.legendText)) {
renderer.px.stage.removeChild(legendGraphic.legendText);
legendGraphic.legendText.destroy();
}
if (legendGraphic.legendGraphics && renderer.px && renderer.px.stage && renderer.px.stage.children && renderer.px.stage.children.includes(legendGraphic.legendGraphics)) {
renderer.px.stage.removeChild(legendGraphic.legendGraphics);
legendGraphic.legendGraphics.destroy();
}
this.tagColors.delete(colorKey);
}
}
}
}
this.linksMap.delete(key);
const reverseLink = this.linksMap.get(reverseKey);
if (reverseLink && reverseLink.pairStatus !== LinkPair.None) {
reverseLink.pairStatus = LinkPair.None;
}
}
removeLinks(renderer: ObsidianRenderer, currentLinks: ObsidianLink[]): void {
const currentKeys = new Set(currentLinks.map(link => this.generateKey(link.source.id, link.target.id)));
// remove any links in our map that aren't in this list
this.linksMap.forEach((_, key) => {
if (!currentKeys.has(key)) {
const link = this.linksMap.get(key);
if (link) {
this.removeLink(renderer, link.obsidianLink);
}
}
});
}
getLinkPairStatus(key: string): LinkPair {
const link = this.linksMap.get(key);
return link ? link.pairStatus : LinkPair.None;
}
// Update the position of the text on the graph
updateLinkText(renderer: ObsidianRenderer, link: ObsidianLink, tagNames: boolean): void {
if (!renderer || !link || !link.source || !link.target) {
// If any of these are null, exit the function
return;
}
const linkKey = this.generateKey(link.source.id, link.target.id);
const gltLink = this.linksMap.get(linkKey);
let text;
if (gltLink) {
text = gltLink.pixiText;
} else {
return
};
// Calculate the mid-point of the link
const midX: number = (link.source.x + link.target.x) / 2;
const midY: number = (link.source.y + link.target.y) / 2;
// Transform the mid-point coordinates based on the renderer's pan and scale
const { x, y } = this.getLinkToTextCoordinates(midX, midY, renderer.panX, renderer.panY, renderer.scale);
if (text && renderer.px && renderer.px.stage && renderer.px.stage.children && renderer.px.stage.children.includes(text)) {
// Set the position and scale of the text
text.x = x;
text.y = y;
text.scale.set(1 / (3 * renderer.nodeScale));
text.style.fill = this.textColor;
if (tagNames) {
if (!link.source || !link.target || !link.source.text || !link.target.text || !link.target.text.alpha || !link.source.text.alpha) {
text.alpha = 0.9;
} else {
text.alpha = Math.max(link.source.text.alpha, link.target.text.alpha);
}
} else {
text.alpha = 0.0;
}
}
}
// Update the position of the text on the graph
updateLinkGraphics(renderer: ObsidianRenderer, link: ObsidianLink): void {
if (!renderer || !link || !link.source || !link.target) {
// If any of these are null, exit the function
return;
}
const linkKey = this.generateKey(link.source.id, link.target.id);
const gltLink = this.linksMap.get(linkKey);
let graphics;
if (gltLink) {
graphics = gltLink.pixiGraphics;
} else {
return
};
let {nx, ny} = this.calculateNormal(link.source.x, link.source.y, link.target.x, link.target.y);
let {px, py} = this.calculateParallel(link.source.x, link.source.y, link.target.x, link.target.y);
nx *= 1.5*Math.sqrt(renderer.scale);
ny *= 1.5*Math.sqrt(renderer.scale);
px *= 8*Math.sqrt(renderer.scale);
py *= 8*Math.sqrt(renderer.scale);
let { x:x1, y:y1 } = this.getLinkToTextCoordinates(link.source.x, link.source.y, renderer.panX, renderer.panY, renderer.scale);
let { x:x2, y:y2 } = this.getLinkToTextCoordinates(link.target.x, link.target.y, renderer.panX, renderer.panY, renderer.scale);
x1 += nx + (link.source.weight/36+1) * px;
x2 += nx - (link.target.weight/36+1) * px;
y1 += ny + (link.source.weight/36+1) * py;
y2 += ny - (link.target.weight/36+1) * py;
if (graphics && renderer.px && renderer.px.stage && renderer.px.stage.children && renderer.px.stage.children.includes(graphics)) {
// @ts-ignore
const color = graphics._lineStyle.color;
// Now, update the line whenever needed without creating a new graphics object each time
graphics.clear(); // Clear the previous drawing to prepare for the update
graphics.lineStyle(3/Math.sqrt(renderer.nodeScale), color); // Set the line style (width: 2px, color: black, alpha: 1)
graphics.alpha = .6;
graphics.moveTo(x1, y1); // Move to the starting point of the line (source node)
graphics.lineTo(x2, y2); // Draw the line to the ending point (target node)
}
}
// Create or update text for a given link
private initializeLinkText(renderer: ObsidianRenderer, link: ObsidianLink, pairStatus : LinkPair): Text | null{
// Get the text to display for the link
let linkString: string | null = this.getMetadataKeyForLink(link.source.id, link.target.id);
if (linkString === null) {
return null;
} //doesn't add if link is null
if (link.source.id === link.target.id) {
linkString = "";
}
if (pairStatus === LinkPair.None) {
} else if (pairStatus === LinkPair.First) {
linkString = linkString + "\n\n";
} else if (pairStatus === LinkPair.Second) {
linkString = "\n\n" + linkString;
} else {
}
// Define the style for the text
const textStyle: TextStyle = new TextStyle({
fontFamily: 'Arial',
fontSize: 36,
fill: this.textColor
});
// Create new text node
const text: Text = new Text(linkString, textStyle);
text.zIndex = 1;
text.anchor.set(0.5, 0.5);
this.updateLinkText(renderer, link, false);
renderer.px.stage.addChild(text);
return text
}
// Create or update text for a given link
private initializeLinkGraphics(renderer: ObsidianRenderer, link: ObsidianLink, tagLegend: boolean): Graphics | null{
// Get the text to display for the link
let linkString: string | null = this.getMetadataKeyForLink(link.source.id, link.target.id);
if (linkString === null) {
return null;
} //doesn't add if link is null
let color;
if (link.source.id === link.target.id) {
linkString = "";
} else {
if (!this.tagColors.has(linkString)) { // this tag is not in the map yet
color = this.categoricalColors[this.currentTagColorIndex];
// Increment and wrap the index to cycle through colors
this.currentTagColorIndex = (this.currentTagColorIndex + 1) % this.categoricalColors.length;
// Create and add the label
const textL = new Text(linkString, { fontFamily: 'Arial', fontSize: 14, fill: this.textColor });
textL.x = this.xOffset;
textL.y = this.yOffset;
renderer.px.stage.addChild(textL);
// Calculate the starting x-coordinate for the line, based on the text width
const lineStartX = this.xOffset + textL.width + this.spaceBetweenTextAndLine;
const graphicsL = new Graphics();
graphicsL.lineStyle(2, color, 1); // Assuming 'color' is in a PIXI-compatible format
graphicsL.moveTo(lineStartX, this.yOffset + (this.lineHeight / 2)); // Start a little below the text
graphicsL.lineTo(lineStartX + this.lineLength, this.yOffset + (this.lineHeight / 2)); // 40 pixels wide line
renderer.px.stage.addChild(graphicsL);
this.yOffset += this.lineHeight;
if (!tagLegend) {
graphicsL.alpha = 0.0;
textL.alpha = 0.0;
}
const newLegendGraphic: GltLegendGraphic = {
color: color,
legendText: textL,
legendGraphics: graphicsL,
nUsing: 0,
};
this.tagColors.set(linkString, newLegendGraphic);
} else { // this tag is in the map already
const legendGraphic = this.tagColors.get(linkString)
if (legendGraphic) {
color = legendGraphic?.color;
legendGraphic.nUsing += 1;
} else {
color = 0xFFFFFF;
}
}
}
const graphics = new Graphics();
graphics.lineStyle(3/Math.sqrt(renderer.nodeScale), color)
graphics.zIndex = 0;
renderer.px.stage.addChild(graphics); // Add the line to the stage
this.updateLinkGraphics(renderer, link);
return graphics
}
// Utility function to extract the file path from a Markdown link
private extractPathFromMarkdownLink(markdownLink: string | unknown): string {
const links = extractLinks(markdownLink).links;
// The package returns an array of links. Assuming you want the first link.
return links.length > 0 ? links[0] : '';
}
// Method to determine the type of a value, now a class method
private determineDataviewLinkType(value: any): DataviewLinkType {
if (typeof value === 'object' && value !== null && 'path' in value) {
return DataviewLinkType.WikiLink;
} else if (typeof value === 'string' && value.includes('](')) {
return DataviewLinkType.MarkdownLink;
} else if (typeof value === 'string') {
return DataviewLinkType.String;
} else if (Array.isArray(value)) {
return DataviewLinkType.Array;
} else {
return DataviewLinkType.Other;
}
}
// Remove all text nodes from the graph
destroyMap(renderer: ObsidianRenderer): void {
if (this.linksMap.size > 0) {
this.linksMap.forEach((gltLink, linkKey) => {
this.removeLink(renderer, gltLink.obsidianLink)
});
}
}
// Get the metadata key for a link between two pages
private getMetadataKeyForLink(sourceId: string, targetId: string): string | null {
const sourcePage: any = this.api.page(sourceId);
if (!sourcePage) return null;
for (const [key, value] of Object.entries(sourcePage)) {
// Skip empty values
if (value === null || value === undefined || value === '') {
continue;
}
const valueType = this.determineDataviewLinkType(value);
switch (valueType) {
case DataviewLinkType.WikiLink:
// @ts-ignore
if (value.path === targetId) {
return key;
}
break;
case DataviewLinkType.MarkdownLink:
if (this.extractPathFromMarkdownLink(value) === targetId) {
return key;
}
break;
case DataviewLinkType.Array:
// @ts-ignore
for (const item of value) {
if (this.determineDataviewLinkType(item) === DataviewLinkType.WikiLink && item.path === targetId) {
return key;
}
if (this.determineDataviewLinkType(item) === DataviewLinkType.MarkdownLink && this.extractPathFromMarkdownLink(item) === targetId) {
return key;
}
}
break;
default:
//metadata is not a link, return null
return null;
}
}
return null;
}
// Function to calculate the coordinates for placing the link text.
private getLinkToTextCoordinates(linkX: number, linkY: number, panX: number, panY: number, scale: number): { x: number, y: number } {
// Apply scaling and panning to calculate the actual position.
return { x: linkX * scale + panX, y: linkY * scale + panY };
}
private calculateNormal(sourceX: number, sourceY: number, targetX: number, targetY: number): { nx: number; ny: number; } {
// Calculate the direction vector D
const dx = targetX - sourceX;
const dy = targetY - sourceY;
// Calculate the normal vector N by rotating D by 90 degrees
let nx = -dy;
let ny = dx;
// Normalize the normal vector to get a unit vector
const length = Math.sqrt(nx * nx + ny * ny);
nx /= length; // Normalize the x component
ny /= length; // Normalize the y component
return { nx, ny };
}
private calculateParallel(sourceX: number, sourceY: number, targetX: number, targetY: number): { px: number; py: number; } {
// Calculate the direction vector D from source to target
const dx = targetX - sourceX;
const dy = targetY - sourceY;
// No need to rotate the vector for a parallel vector
// Normalize the direction vector to get a unit vector
const length = Math.sqrt(dx * dx + dy * dy);
const px = dx / length; // Normalize the x component
const py = dy / length; // Normalize the y component
return { px, py };
}
}