Library for Calculator (Graphing)
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.cn-greasyfork.org/scripts/503150/1425747/Graphing%20Plugin.js
// ==UserScript==
// @name Graphing Plugin
// @namespace https://greasyfork.org/en/users/1291009
// @author BadOrBest
// @license MIT
// @version 1.4
// @description A library for adding and managing graphs on any webpage.
// @grant none
// @require https://cdnjs.cloudflare.com/ajax/libs/mathjs/13.0.3/math.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/Chart.js/4.4.1/chart.min.js
// ==/UserScript==
(function(global) {
'use strict';
console.log('Graphing Library loaded');
global.GraphingLibrary = {
chartInstance: null,
createCanvas: function() {
let canvas = document.getElementById('graphCanvas');
if (!canvas) {
canvas = document.createElement('canvas');
canvas.id = 'graphCanvas';
canvas.style.position = 'fixed';
canvas.style.bottom = '0';
canvas.style.right = '0';
canvas.style.zIndex = '9999';
canvas.style.width = '600px'; // Set canvas width
canvas.style.height = '400px'; // Set canvas height
document.body.appendChild(canvas);
console.log('Canvas created');
}
return canvas;
},
updateGraph: function() {
console.log('Updating graph');
const graphData = JSON.parse(localStorage.getItem('graphData') || '[]');
const canvas = this.createCanvas();
const ctx = canvas.getContext('2d');
if (this.chartInstance) {
this.chartInstance.destroy();
}
this.chartInstance = new Chart(ctx, {
type: 'line',
data: {
datasets: graphData.map(data => ({
label: data.label,
data: data.points,
borderColor: data.color || 'blue',
borderWidth: 1,
fill: false
}))
},
options: {
scales: {
x: {
type: 'linear',
position: 'bottom'
}
}
}
});
},
toggleGraph: function() {
const canvas = this.createCanvas();
canvas.style.display = canvas.style.display === 'none' ? 'block' : 'none';
if (canvas.style.display === 'block') {
this.updateGraph();
}
console.log('Toggled graph display');
},
clearGraph: function() {
localStorage.setItem('graphData', JSON.stringify([]));
const canvas = document.getElementById('graphCanvas');
if (canvas) {
canvas.style.display = 'none';
}
if (this.chartInstance) {
this.chartInstance.destroy();
this.chartInstance = null;
}
console.log('Cleared graph data');
},
addGraphData: function(expression) {
if (expression) {
try {
const xValues = Array.from({ length: 100 }, (_, i) => i - 50); // X values from -50 to 50
const yValues = xValues.map(x => math.evaluate(expression.replace(/x/g, x))); // Evaluate expression
const newGraphData = JSON.parse(localStorage.getItem('graphData') || '[]');
newGraphData.push({
label: `Graph ${newGraphData.length + 1}`,
points: xValues.map((x, i) => ({ x, y: yValues[i] }))
});
localStorage.setItem('graphData', JSON.stringify(newGraphData));
this.updateGraph();
console.log('Added graph data');
} catch (error) {
alert('Error evaluating expression: ' + error.message);
console.error('Error evaluating expression:', error);
}
}
}
};
// Initialize or update the graph display if needed
if (JSON.parse(localStorage.getItem('graphData') || '[]').length > 0) {
GraphingLibrary.toggleGraph();
}
})(window);