步骤 1，初始化画布8号彩票大发3d

步骤 1，初始化画布8号彩票大发3d，

本文目录导读：

步骤 2：定义黄ight效果
步骤 3：动态调整黄ight
步骤 4：完整代码
步骤 5：运行代码
注意事项

黄ight是一种在HTML5 Canvas中实现的动态灯光效果，用于在画布上创建一个闪烁的圆形灯光，以下是实现黄ight效果的步骤说明：使用canvas元素并设置其尺寸和背景色，以便在上面绘制图形。

const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
canvas.width = 800;
canvas.height = 600;
canvas.style.backgroundColor = '#ffffff';

步骤 2：定义黄ight效果

黄ight效果需要一个中心点和围绕中心点的光线,使用drawCircle()函数绘制圆形灯光。

const centerX = canvas.width / 2;
const centerY = canvas.height / 2;
const radius = 50;
function drawLightningEffect() {
    ctx.beginPath();
    ctx.arc(centerX, centerY, radius, 0, Math.PI * 2);
    ctx.fillStyle = `radial-gradient(circle at 0 0, ${'#fff000'}, ${'#00fff000'})`;
    ctx.fill();
    ctx.closePath();
}

步骤 3：动态调整黄ight

为了使黄ight效果动态变化,可以在每次循环中调整光线的位置和亮度。

function animateLightning() {
    let brightness = 100;
    const interval = 100;
    const maxSteps = 100;
    function update() {
        brightness += (Math.random() - 0.5) * 0.5;
        if (brightness < 0) brightness = 0;
        drawLightningEffect();
    }
    for(let i = 0; i < maxSteps; i++) {
        update();
        setTimeout(update, interval);
    }
}
animateLightning();

步骤 4：完整代码

将以上步骤整合成一个完整的HTML5 Canvas应用程序。

<!DOCTYPE html>
<html>
<head>黄ight效果</title>
</head>
<body>
    <canvas id="canvas"></canvas>
    <script>
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');
        canvas.width = 800;
        canvas.height = 600;
        const centerX = canvas.width / 2;
        const centerY = canvas.height / 2;
        const radius = 50;
        function drawLightningEffect() {
            ctx.beginPath();
            ctx.arc(centerX, centerY, radius, 0, Math.PI * 2);
            ctx.fillStyle = `radial-gradient(circle at 0 0, ${'#fff000'}, ${'#00fff000'})`;
            ctx.fill();
            ctx.closePath();
        }
        function animateLightning() {
            let brightness = 100;
            const interval = 100;
            const maxSteps = 100;
            function update() {
                brightness += (Math.random() - 0.5) * 0.5;
                if (brightness < 0) brightness = 0;
                drawLightningEffect();
            }
            for(let i = 0; i < maxSteps; i++) {
                update();
                setTimeout(update, interval);
            }
        }
        // 调用动画函数
        animateLightning();
    </script>
</body>
</html>