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568 lines
17 KiB
568 lines
17 KiB
// Although inspired by the https://github.com/bluef/gitgraph.js/blob/master/gitgraph.js
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// this has been completely rewritten with almost no remaining code
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// GitGraphCanvas is a canvas for drawing gitgraphs on to
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class GitGraphCanvas {
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constructor(canvas, widthUnits, heightUnits, config) {
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this.ctx = canvas.getContext('2d');
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const width = widthUnits * config.unitSize;
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this.height = heightUnits * config.unitSize;
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const ratio = window.devicePixelRatio || 1;
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canvas.width = width * ratio;
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canvas.height = this.height * ratio;
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canvas.style.width = `${width}px`;
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canvas.style.height = `${this.height}px`;
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this.ctx.lineWidth = config.lineWidth;
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this.ctx.lineJoin = 'round';
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this.ctx.lineCap = 'round';
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this.ctx.scale(ratio, ratio);
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this.config = config;
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}
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drawLine(moveX, moveY, lineX, lineY, color) {
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this.ctx.strokeStyle = color;
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this.ctx.beginPath();
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this.ctx.moveTo(moveX, moveY);
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this.ctx.lineTo(lineX, lineY);
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this.ctx.stroke();
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}
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drawLineRight(x, y, color) {
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this.drawLine(
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x - 0.5 * this.config.unitSize,
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y + this.config.unitSize / 2,
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x + 0.5 * this.config.unitSize,
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y + this.config.unitSize / 2,
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color
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);
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}
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drawLineUp(x, y, color) {
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this.drawLine(
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x,
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y + this.config.unitSize / 2,
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x,
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y - this.config.unitSize / 2,
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color
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);
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}
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drawNode(x, y, color) {
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this.ctx.strokeStyle = color;
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this.drawLineUp(x, y, color);
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this.ctx.beginPath();
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this.ctx.arc(x, y, this.config.nodeRadius, 0, Math.PI * 2, true);
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this.ctx.fillStyle = color;
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this.ctx.fill();
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}
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drawLineIn(x, y, color) {
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this.drawLine(
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x + 0.5 * this.config.unitSize,
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y + this.config.unitSize / 2,
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x - 0.5 * this.config.unitSize,
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y - this.config.unitSize / 2,
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color
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);
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}
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drawLineOut(x, y, color) {
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this.drawLine(
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x - 0.5 * this.config.unitSize,
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y + this.config.unitSize / 2,
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x + 0.5 * this.config.unitSize,
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y - this.config.unitSize / 2,
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color
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);
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}
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drawSymbol(symbol, columnNumber, rowNumber, color) {
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const y = this.height - this.config.unitSize * (rowNumber + 0.5);
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const x = this.config.unitSize * 0.5 * (columnNumber + 1);
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switch (symbol) {
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case '-':
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if (columnNumber % 2 === 1) {
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this.drawLineRight(x, y, color);
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}
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break;
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case '_':
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this.drawLineRight(x, y, color);
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break;
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case '*':
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this.drawNode(x, y, color);
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break;
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case '|':
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this.drawLineUp(x, y, color);
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break;
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case '/':
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this.drawLineOut(x, y, color);
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break;
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case '\\':
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this.drawLineIn(x, y, color);
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break;
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case '.':
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case ' ':
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break;
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default:
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console.error('Unknown symbol', symbol, color);
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}
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}
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}
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class GitGraph {
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constructor(canvas, rawRows, config) {
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this.rows = [];
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let maxWidth = 0;
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for (let i = 0; i < rawRows.length; i++) {
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const rowStr = rawRows[i];
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maxWidth = Math.max(rowStr.replace(/([_\s.-])/g, '').length, maxWidth);
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const rowArray = rowStr.split('');
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this.rows.unshift(rowArray);
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}
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this.currentFlows = [];
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this.previousFlows = [];
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this.gitGraphCanvas = new GitGraphCanvas(
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canvas,
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maxWidth,
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this.rows.length,
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config
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);
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}
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generateNewFlow(column) {
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let newId;
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do {
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newId = generateRandomColorString();
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} while (this.hasFlow(newId, column));
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return {id: newId, color: `#${newId}`};
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}
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hasFlow(id, column) {
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// We want to find the flow with the current ID
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// Possible flows are those in the currentFlows
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// Or flows in previousFlows[column-2:...]
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for (
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let idx = column - 2 < 0 ? 0 : column - 2;
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idx < this.previousFlows.length;
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idx++
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) {
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if (this.previousFlows[idx] && this.previousFlows[idx].id === id) {
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return true;
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}
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}
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for (let idx = 0; idx < this.currentFlows.length; idx++) {
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if (this.currentFlows[idx] && this.currentFlows[idx].id === id) {
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return true;
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}
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}
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return false;
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}
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takePreviousFlow(column) {
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if (column < this.previousFlows.length && this.previousFlows[column]) {
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const flow = this.previousFlows[column];
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this.previousFlows[column] = null;
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return flow;
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}
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return this.generateNewFlow(column);
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}
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draw() {
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if (this.rows.length === 0) {
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return;
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}
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this.currentFlows = new Array(this.rows[0].length);
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// Generate flows for the first row - I do not believe that this can contain '_', '-', '.'
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for (let column = 0; column < this.rows[0].length; column++) {
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if (this.rows[0][column] === ' ') {
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continue;
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}
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this.currentFlows[column] = this.generateNewFlow(column);
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}
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// Draw the first row
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for (let column = 0; column < this.rows[0].length; column++) {
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const symbol = this.rows[0][column];
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const color = this.currentFlows[column] ? this.currentFlows[column].color : '';
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this.gitGraphCanvas.drawSymbol(symbol, column, 0, color);
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}
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for (let row = 1; row < this.rows.length; row++) {
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// Done previous row - step up the row
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const currentRow = this.rows[row];
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const previousRow = this.rows[row - 1];
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this.previousFlows = this.currentFlows;
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this.currentFlows = new Array(currentRow.length);
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// Set flows for this row
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for (let column = 0; column < currentRow.length; column++) {
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column = this.setFlowFor(column, currentRow, previousRow);
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}
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// Draw this row
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for (let column = 0; column < currentRow.length; column++) {
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const symbol = currentRow[column];
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const color = this.currentFlows[column] ? this.currentFlows[column].color : '';
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this.gitGraphCanvas.drawSymbol(symbol, column, row, color);
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}
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}
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}
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setFlowFor(column, currentRow, previousRow) {
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const symbol = currentRow[column];
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switch (symbol) {
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case '|':
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case '*':
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return this.setUpFlow(column, currentRow, previousRow);
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case '/':
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return this.setOutFlow(column, currentRow, previousRow);
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case '\\':
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return this.setInFlow(column, currentRow, previousRow);
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case '_':
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return this.setRightFlow(column, currentRow, previousRow);
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case '-':
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return this.setLeftFlow(column, currentRow, previousRow);
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case ' ':
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// In space no one can hear you flow ... (?)
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return column;
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default:
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// Unexpected so let's generate a new flow and wait for bug-reports
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this.currentFlows[column] = this.generateNewFlow(column);
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return column;
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}
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}
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// setUpFlow handles '|' or '*' - returns the last column that was set
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// generally we prefer to take the left most flow from the previous row
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setUpFlow(column, currentRow, previousRow) {
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// If ' |/' or ' |_'
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// '/|' '/|' -> Take the '|' flow directly beneath us
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if (
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column + 1 < currentRow.length &&
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(currentRow[column + 1] === '/' || currentRow[column + 1] === '_') &&
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column < previousRow.length &&
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(previousRow[column] === '|' || previousRow[column] === '*') &&
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previousRow[column - 1] === '/'
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) {
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this.currentFlows[column] = this.takePreviousFlow(column);
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return column;
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}
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// If ' |/' or ' |_'
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// '/ ' '/ ' -> Take the '/' flow from the preceding column
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if (
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column + 1 < currentRow.length &&
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(currentRow[column + 1] === '/' || currentRow[column + 1] === '_') &&
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column - 1 < previousRow.length &&
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previousRow[column - 1] === '/'
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) {
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this.currentFlows[column] = this.takePreviousFlow(column - 1);
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return column;
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}
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// If ' |'
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// '/' -> Take the '/' flow - (we always prefer the left-most flow)
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if (
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column > 0 &&
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column - 1 < previousRow.length &&
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previousRow[column - 1] === '/'
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) {
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this.currentFlows[column] = this.takePreviousFlow(column - 1);
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return column;
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}
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// If '|' OR '|' take the '|' flow
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// '|' '*'
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if (
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column < previousRow.length &&
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(previousRow[column] === '|' || previousRow[column] === '*')
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) {
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this.currentFlows[column] = this.takePreviousFlow(column);
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return column;
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}
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// If '| ' keep the '\' flow
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// ' \'
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if (column + 1 < previousRow.length && previousRow[column + 1] === '\\') {
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this.currentFlows[column] = this.takePreviousFlow(column + 1);
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return column;
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}
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// Otherwise just create a new flow - probably this is an error...
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this.currentFlows[column] = this.generateNewFlow(column);
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return column;
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}
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// setOutFlow handles '/' - returns the last column that was set
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// generally we prefer to take the left most flow from the previous row
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setOutFlow(column, currentRow, previousRow) {
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// If '_/' -> keep the '_' flow
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if (column > 0 && currentRow[column - 1] === '_') {
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this.currentFlows[column] = this.currentFlows[column - 1];
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return column;
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}
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// If '_|/' -> keep the '_' flow
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if (
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column > 1 &&
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(currentRow[column - 1] === '|' || currentRow[column - 1] === '*') &&
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currentRow[column - 2] === '_'
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) {
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this.currentFlows[column] = this.currentFlows[column - 2];
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return column;
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}
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// If '|/'
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// '/' -> take the '/' flow (if it is still available)
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if (
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column > 1 &&
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currentRow[column - 1] === '|' &&
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column - 2 < previousRow.length &&
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previousRow[column - 2] === '/'
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) {
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this.currentFlows[column] = this.takePreviousFlow(column - 2);
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return column;
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}
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// If ' /'
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// '/' -> take the '/' flow, but transform the symbol to '|' due to our spacing
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// This should only happen if there are 3 '/' - in a row so we don't need to be cleverer here
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if (
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column > 0 &&
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currentRow[column - 1] === ' ' &&
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column - 1 < previousRow.length &&
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previousRow[column - 1] === '/'
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) {
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this.currentFlows[column] = this.takePreviousFlow(column - 1);
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currentRow[column] = '|';
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return column;
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}
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// If ' /'
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// '|' -> take the '|' flow
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if (
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column > 0 &&
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currentRow[column - 1] === ' ' &&
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column - 1 < previousRow.length &&
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(previousRow[column - 1] === '|' || previousRow[column - 1] === '*')
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) {
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this.currentFlows[column] = this.takePreviousFlow(column - 1);
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return column;
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}
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// If '/' <- Not sure this ever happens... but take the '\' flow
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// '\'
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if (column < previousRow.length && previousRow[column] === '\\') {
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this.currentFlows[column] = this.takePreviousFlow(column);
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return column;
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}
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// Otherwise just generate a new flow and wait for bug-reports...
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this.currentFlows[column] = this.generateNewFlow(column);
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return column;
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}
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// setInFlow handles '\' - returns the last column that was set
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// generally we prefer to take the left most flow from the previous row
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setInFlow(column, currentRow, previousRow) {
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// If '\?'
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// '/?' -> take the '/' flow
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if (column < previousRow.length && previousRow[column] === '/') {
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this.currentFlows[column] = this.takePreviousFlow(column);
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return column;
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}
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// If '\?'
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// ' \' -> take the '\' flow and reassign to '|'
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// This should only happen if there are 3 '\' - in a row so we don't need to be cleverer here
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if (column + 1 < previousRow.length && previousRow[column + 1] === '\\') {
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this.currentFlows[column] = this.takePreviousFlow(column + 1);
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currentRow[column] = '|';
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return column;
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}
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// If '\?'
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// ' |' -> take the '|' flow
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if (
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column + 1 < previousRow.length &&
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(previousRow[column + 1] === '|' || previousRow[column + 1] === '*')
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) {
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this.currentFlows[column] = this.takePreviousFlow(column + 1);
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return column;
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}
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// Otherwise just generate a new flow and wait for bug-reports if we're wrong...
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this.currentFlows[column] = this.generateNewFlow(column);
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return column;
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}
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// setRightFlow handles '_' - returns the last column that was set
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// generally we prefer to take the left most flow from the previous row
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setRightFlow(column, currentRow, previousRow) {
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// if '__' keep the '_' flow
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if (column > 0 && currentRow[column - 1] === '_') {
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this.currentFlows[column] = this.currentFlows[column - 1];
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return column;
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}
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// if '_|_' -> keep the '_' flow
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if (
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column > 1 &&
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currentRow[column - 1] === '|' &&
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currentRow[column - 2] === '_'
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) {
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this.currentFlows[column] = this.currentFlows[column - 2];
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return column;
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}
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// if ' _' -> take the '/' flow
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// '/ '
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if (
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column > 0 &&
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column - 1 < previousRow.length &&
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previousRow[column - 1] === '/'
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) {
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this.currentFlows[column] = this.takePreviousFlow(column - 1);
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return column;
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}
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// if ' |_'
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// '/? ' -> take the '/' flow (this may cause generation...)
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// we can do this because we know that git graph
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// doesn't create compact graphs like: ' |_'
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// '//'
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if (
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column > 1 &&
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column - 2 < previousRow.length &&
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previousRow[column - 2] === '/'
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) {
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this.currentFlows[column] = this.takePreviousFlow(column - 2);
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return column;
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}
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// There really shouldn't be another way of doing this - generate and wait for bug-reports...
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this.currentFlows[column] = this.generateNewFlow(column);
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return column;
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}
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// setLeftFlow handles '----.' - returns the last column that was set
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// generally we prefer to take the left most flow from the previous row that terminates this left recursion
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setLeftFlow(column, currentRow, previousRow) {
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// This is: '----------.' or the like
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// ' \ \ /|\'
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// Find the end of the '-' or nearest '/|\' in the previousRow :
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let originalColumn = column;
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let flow;
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for (; column < currentRow.length && currentRow[column] === '-'; column++) {
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if (column > 0 && column - 1 < previousRow.length && previousRow[column - 1] === '/') {
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flow = this.takePreviousFlow(column - 1);
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break;
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} else if (column < previousRow.length && previousRow[column] === '|') {
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flow = this.takePreviousFlow(column);
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break;
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} else if (
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column + 1 < previousRow.length &&
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previousRow[column + 1] === '\\'
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) {
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flow = this.takePreviousFlow(column + 1);
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break;
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}
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}
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// if we have a flow then we found a '/|\' in the previousRow
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if (flow) {
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for (; originalColumn < column + 1; originalColumn++) {
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this.currentFlows[originalColumn] = flow;
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}
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return column;
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}
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// If the symbol in the column is not a '.' then there's likely an error
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if (currentRow[column] !== '.') {
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// It really should end in a '.' but this one doesn't...
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// 1. Step back - we don't want to eat this column
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column--;
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// 2. Generate a new flow and await bug-reports...
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this.currentFlows[column] = this.generateNewFlow(column);
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// 3. Assign all of the '-' to the same flow.
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for (; originalColumn < column; originalColumn++) {
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this.currentFlows[originalColumn] = this.currentFlows[column];
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}
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return column;
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}
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// We have a terminal '.' eg. the current row looks like '----.'
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// the previous row should look like one of '/|\' eg. ' \'
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if (column > 0 && column - 1 < previousRow.length && previousRow[column - 1] === '/') {
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flow = this.takePreviousFlow(column - 1);
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} else if (column < previousRow.length && previousRow[column] === '|') {
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flow = this.takePreviousFlow(column);
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} else if (
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column + 1 < previousRow.length &&
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previousRow[column + 1] === '\\'
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) {
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flow = this.takePreviousFlow(column + 1);
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} else {
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// Again unexpected so let's generate and wait the bug-report
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|
flow = this.generateNewFlow(column);
|
|
}
|
|
|
|
// Assign all of the rest of the ----. to this flow.
|
|
for (; originalColumn < column + 1; originalColumn++) {
|
|
this.currentFlows[originalColumn] = flow;
|
|
}
|
|
|
|
return column;
|
|
}
|
|
}
|
|
|
|
function generateRandomColorString() {
|
|
const chars = '0123456789ABCDEF';
|
|
const stringLength = 6;
|
|
let randomString = '',
|
|
rnum,
|
|
i;
|
|
for (i = 0; i < stringLength; i++) {
|
|
rnum = Math.floor(Math.random() * chars.length);
|
|
randomString += chars.substring(rnum, rnum + 1);
|
|
}
|
|
|
|
return randomString;
|
|
}
|
|
|
|
export default async function initGitGraph() {
|
|
const graphCanvas = document.getElementById('graph-canvas');
|
|
if (!graphCanvas || !graphCanvas.getContext) return;
|
|
|
|
// Grab the raw graphList
|
|
const graphList = [];
|
|
$('#graph-raw-list li span.node-relation').each(function () {
|
|
graphList.push($(this).text());
|
|
});
|
|
|
|
// Define some drawing parameters
|
|
const config = {
|
|
unitSize: 20,
|
|
lineWidth: 3,
|
|
nodeRadius: 4
|
|
};
|
|
|
|
|
|
const gitGraph = new GitGraph(graphCanvas, graphList, config);
|
|
gitGraph.draw();
|
|
graphCanvas.closest('#git-graph-container').classList.add('in');
|
|
}
|
|
|