[JavaScript]canvas.clip|ktyr report

[JavaScript]canvas.clip

JavaScript

2022-03-01

animate() {
    requestAnimationFrame(()=>{
        this.animate();
    });
    const ctx;
    ctx = canvas.getContext('2d');
    ctx.globalCompositeOperation = "source-over";
    ctx.globalAlpha = 1.0;
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.save();
    ctx.beginPath();
    ctx.rect(0,0,canvas.width,100);
    ctx.clip();
    //ここに描画処理
    ctx.restore();
}