File size: 5,399 Bytes
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class CustomChart extends HTMLElement {
constructor() {
super();
}
connectedCallback() {
this.attachShadow({ mode: 'open' });
const type = this.getAttribute('type') || 'line';
const data = (this.getAttribute('data') || '').split(',').map(Number);
const labels = (this.getAttribute('labels') || '').split(',');
const max = Math.max(...data);
const min = Math.min(...data);
const range = max - min || 1;
const width = 600;
const height = 200;
const padding = 30;
// Generate points for line chart
const points = data.map((value, index) => {
const x = padding + (index / (data.length - 1)) * (width - 2 * padding);
const y = height - padding - ((value - min) / range) * (height - 2 * padding);
return `${x},${y}`;
}).join(' ');
// Generate grid lines
let gridLines = '';
for (let i = 0; i <= 4; i++) {
const y = padding + (i / 4) * (height - 2 * padding);
gridLines += `<line x1="${padding}" y1="${y}" x2="${width - padding}" y2="${y}" class="chart-grid"/>`;
}
// Generate data points (circles)
let pointCircles = '';
data.forEach((value, index) => {
const x = padding + (index / (data.length - 1)) * (width - 2 * padding);
const y = height - padding - ((value - min) / range) * (height - 2 * padding);
pointCircles += `<circle cx="${x}" cy="${y}" class="chart-point" data-value="${value}"/>`;
});
// Generate labels
let xLabels = '';
labels.forEach((label, index) => {
const x = padding + (index / (labels.length - 1)) * (width - 2 * padding);
xLabels += `<text x="${x}" y="${height - 8}" class="chart-label" text-anchor="middle">${label}</text>`;
});
// Generate y-axis labels
let yLabels = '';
for (let i = 0; i <= 4; i++) {
const y = padding + (i / 4) * (height - 2 * padding);
const value = Math.round(max - (i / 4) * range);
yLabels += `<text x="${padding - 8}" y="${y + 4}" class="chart-label" text-anchor="end">${value}</text>`;
}
this.shadowRoot.innerHTML = `
<style>
:host {
display: block;
width: 100%;
}
svg {
width: 100%;
height: 100%;
overflow: visible;
}
.chart-line {
fill: none;
stroke: #22c55e;
stroke-width: 2;
stroke-linecap: round;
stroke-linejoin: round;
filter: drop-shadow(0 0 4px rgba(34, 197, 94, 0.5));
}
.chart-grid {
stroke: #1f2937;
stroke-width: 1;
stroke-dasharray: 4 4;
}
.chart-label {
fill: #6b7280;
font-size: 10px;
font-family: monospace;
}
.chart-point {
fill: #0a0a0a;
stroke: #22c55e;
stroke-width: 2;
r: 4;
transition: all 0.2s;
cursor: pointer;
}
.chart-point:hover {
r: 6;
fill: #22c55e;
}
.tooltip {
position: absolute;
background: #1f2937;
color: #fff;
padding: 4px 8px;
border-radius: 4px;
font-size: 12px;
pointer-events: none;
opacity: 0;
transition: opacity 0.2s;
}
</style>
<div style="height: 200px; position: relative;">
<svg viewBox="0 0 ${width} ${height}">
${gridLines}
<polyline points="${points}" class="chart-line"/>
${pointCircles}
${xLabels}
${yLabels}
</svg>
</div>
`;
// Add tooltips
const points = this.shadowRoot.querySelectorAll('.chart-point');
points.forEach(point => {
point.addEventListener('mouseenter', (e) => {
const tooltip = document.createElement('div');
tooltip.className = 'tooltip';
tooltip.textContent = `Value: ${e.target.dataset.value}`;
tooltip.style.left = `${e.target.cx.baseVal.value + 10}px`;
tooltip.style.top = `${e.target.cy.baseVal.value - 30}px`;
this.shadowRoot.appendChild(tooltip);
setTimeout(() => tooltip.style.opacity = '1', 10);
});
point.addEventListener('mouseleave', () => {
const tooltip = this.shadowRoot.querySelector('.tooltip');
if (tooltip) tooltip.remove();
});
});
}
}
customElements.define('custom-chart', CustomChart); |