HTML5 Canvas实现放大镜效果示例

function drawMagnifyingGlass() { calScaleLines(); context.save(); context.beginPath(); context.arc(centerPoint.x, centerPoint.y, originalRadius, 0, Math.PI * 2, false); context.clip(); context.beginPath(); context.fillStyle = "#fff"; context.arc(centerPoint.x, centerPoint.y, originalRadius, 0, Math.PI * 2, false); context.fill(); context.lineWidth = 4; for (var i = 0; i < glassLineSize; i++) { context.beginPath(); context.strokeStyle = scaleGlassLines[i].color; context.moveTo(scaleGlassRectangle.x + scaleGlassLines[i].xStart, scaleGlassRectangle.y + scaleGlassLines[i].yStart); context.lineTo(scaleGlassRectangle.x + scaleGlassLines[i].xEnd, scaleGlassRectangle.y + scaleGlassLines[i].yEnd); context.stroke(); } context.restore(); context.beginPath(); var gradient = context.createRadialGradient( parseInt(centerPoint.x), parseInt(centerPoint.y), originalRadius - 5, parseInt(centerPoint.x), parseInt(centerPoint.y), originalRadius); gradient.addColorStop(0.50, 'silver'); gradient.addColorStop(0.90, 'silver'); gradient.addColorStop(1, 'black'); context.strokeStyle = gradient; context.lineWidth = 5; context.arc(parseInt(centerPoint.x), parseInt(centerPoint.y), originalRadius, 0, Math.PI * 2, false); context.stroke(); drawAnchor(); }

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