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import React, { useEffect, useRef } from 'react';
import './Chart.css';
const Chart = ({
data = [],
type = 'line',
width = 400,
height = 300,
title = '',
xLabel = '',
yLabel = '',
color = '#2E7D32',
showGrid = true,
showLegend = true,
animate = true
}) => {
const canvasRef = useRef(null);
const containerRef = useRef(null);
useEffect(() => {
if (!data.length) return;
const canvas = canvasRef.current;
const ctx = canvas.getContext('2d');
const container = containerRef.current;
// Set canvas size
const rect = container.getBoundingClientRect();
canvas.width = rect.width;
canvas.height = rect.height;
// Clear canvas
ctx.clearRect(0, 0, canvas.width, canvas.height);
// Draw chart based on type
switch (type) {
case 'line':
drawLineChart(ctx, data, canvas.width, canvas.height, color, showGrid);
break;
case 'bar':
drawBarChart(ctx, data, canvas.width, canvas.height, color, showGrid);
break;
case 'pie':
drawPieChart(ctx, data, canvas.width, canvas.height);
break;
case 'area':
drawAreaChart(ctx, data, canvas.width, canvas.height, color, showGrid);
break;
default:
drawLineChart(ctx, data, canvas.width, canvas.height, color, showGrid);
}
// Add labels if provided
if (title) {
drawTitle(ctx, title, canvas.width);
}
}, [data, type, color, showGrid, title]);
const drawLineChart = (ctx, data, width, height, color, showGrid) => {
const padding = 60;
const chartWidth = width - 2 * padding;
const chartHeight = height - 2 * padding;
// Find min/max values
const values = data.map(d => d.value || d.y || d);
const minValue = Math.min(...values);
const maxValue = Math.max(...values);
const valueRange = maxValue - minValue || 1;
// Draw grid
if (showGrid) {
ctx.strokeStyle = '#e0e0e0';
ctx.lineWidth = 1;
// Horizontal grid lines
for (let i = 0; i <= 5; i++) {
const y = padding + (chartHeight / 5) * i;
ctx.beginPath();
ctx.moveTo(padding, y);
ctx.lineTo(width - padding, y);
ctx.stroke();
}
// Vertical grid lines
for (let i = 0; i <= data.length - 1; i++) {
const x = padding + (chartWidth / (data.length - 1)) * i;
ctx.beginPath();
ctx.moveTo(x, padding);
ctx.lineTo(x, height - padding);
ctx.stroke();
}
}
// Draw line
ctx.strokeStyle = color;
ctx.lineWidth = 3;
ctx.beginPath();
data.forEach((point, index) => {
const value = point.value || point.y || point;
const x = padding + (chartWidth / (data.length - 1)) * index;
const y = height - padding - ((value - minValue) / valueRange) * chartHeight;
if (index === 0) {
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
}
});
ctx.stroke();
// Draw points
ctx.fillStyle = color;
data.forEach((point, index) => {
const value = point.value || point.y || point;
const x = padding + (chartWidth / (data.length - 1)) * index;
const y = height - padding - ((value - minValue) / valueRange) * chartHeight;
ctx.beginPath();
ctx.arc(x, y, 4, 0, 2 * Math.PI);
ctx.fill();
});
};
const drawBarChart = (ctx, data, width, height, color, showGrid) => {
const padding = 60;
const chartWidth = width - 2 * padding;
const chartHeight = height - 2 * padding;
const values = data.map(d => d.value || d.y || d);
const maxValue = Math.max(...values);
const barWidth = chartWidth / data.length * 0.8;
const barSpacing = chartWidth / data.length * 0.2;
// Draw grid
if (showGrid) {
ctx.strokeStyle = '#e0e0e0';
ctx.lineWidth = 1;
for (let i = 0; i <= 5; i++) {
const y = padding + (chartHeight / 5) * i;
ctx.beginPath();
ctx.moveTo(padding, y);
ctx.lineTo(width - padding, y);
ctx.stroke();
}
}
// Draw bars
ctx.fillStyle = color;
data.forEach((point, index) => {
const value = point.value || point.y || point;
const barHeight = (value / maxValue) * chartHeight;
const x = padding + index * (barWidth + barSpacing) + barSpacing / 2;
const y = height - padding - barHeight;
ctx.fillRect(x, y, barWidth, barHeight);
});
};
const drawPieChart = (ctx, data, width, height) => {
const centerX = width / 2;
const centerY = height / 2;
const radius = Math.min(width, height) / 2 - 40;
const total = data.reduce((sum, d) => sum + (d.value || d.y || d), 0);
let currentAngle = -Math.PI / 2;
const colors = [
'#2E7D32', '#4CAF50', '#66BB6A', '#81C784', '#A5D6A7',
'#FF9800', '#FFA726', '#FFB74D', '#FFCC02', '#FFD54F'
];
data.forEach((point, index) => {
const value = point.value || point.y || point;
const sliceAngle = (value / total) * 2 * Math.PI;
ctx.fillStyle = colors[index % colors.length];
ctx.beginPath();
ctx.moveTo(centerX, centerY);
ctx.arc(centerX, centerY, radius, currentAngle, currentAngle + sliceAngle);
ctx.closePath();
ctx.fill();
// Draw label
const labelAngle = currentAngle + sliceAngle / 2;
const labelX = centerX + Math.cos(labelAngle) * (radius * 0.7);
const labelY = centerY + Math.sin(labelAngle) * (radius * 0.7);
ctx.fillStyle = '#fff';
ctx.font = '12px Arial';
ctx.textAlign = 'center';
ctx.fillText(`${Math.round((value / total) * 100)}%`, labelX, labelY);
currentAngle += sliceAngle;
});
};
const drawAreaChart = (ctx, data, width, height, color, showGrid) => {
const padding = 60;
const chartWidth = width - 2 * padding;
const chartHeight = height - 2 * padding;
const values = data.map(d => d.value || d.y || d);
const minValue = Math.min(...values);
const maxValue = Math.max(...values);
const valueRange = maxValue - minValue || 1;
// Draw grid
if (showGrid) {
ctx.strokeStyle = '#e0e0e0';
ctx.lineWidth = 1;
for (let i = 0; i <= 5; i++) {
const y = padding + (chartHeight / 5) * i;
ctx.beginPath();
ctx.moveTo(padding, y);
ctx.lineTo(width - padding, y);
ctx.stroke();
}
}
// Create gradient
const gradient = ctx.createLinearGradient(0, padding, 0, height - padding);
gradient.addColorStop(0, color + '80');
gradient.addColorStop(1, color + '20');
// Draw area
ctx.fillStyle = gradient;
ctx.beginPath();
// Start from bottom left
ctx.moveTo(padding, height - padding);
// Draw line to each point
data.forEach((point, index) => {
const value = point.value || point.y || point;
const x = padding + (chartWidth / (data.length - 1)) * index;
const y = height - padding - ((value - minValue) / valueRange) * chartHeight;
ctx.lineTo(x, y);
});
// Close path to bottom right
ctx.lineTo(width - padding, height - padding);
ctx.closePath();
ctx.fill();
// Draw line on top
ctx.strokeStyle = color;
ctx.lineWidth = 2;
ctx.beginPath();
data.forEach((point, index) => {
const value = point.value || point.y || point;
const x = padding + (chartWidth / (data.length - 1)) * index;
const y = height - padding - ((value - minValue) / valueRange) * chartHeight;
if (index === 0) {
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
}
});
ctx.stroke();
};
const drawTitle = (ctx, title, width) => {
ctx.fillStyle = '#333';
ctx.font = 'bold 16px Arial';
ctx.textAlign = 'center';
ctx.fillText(title, width / 2, 30);
};
return (
<div className="chart-container" ref={containerRef} style={{ width, height }}>
<canvas ref={canvasRef} className="chart-canvas" />
{showLegend && data.length > 0 && data[0].label && (
<div className="chart-legend">
{data.map((item, index) => (
<div key={index} className="legend-item">
<div
className="legend-color"
style={{ backgroundColor: color }}
/>
<span className="legend-label">{item.label}</span>
</div>
))}
</div>
)}
</div>
);
};
export default Chart; |