W3Schools Canvas 演示 - W3Schools 教學

#myCanvas

arcTo

100,20,100,70,10|100,20,100,70,20|100,20,100,70,30|100,20,100,70,40|100,20,100,70,50|100,20,100,70,60|100,20,100,70,70|100,20,100,70,80|100,20,100,70,90|100,20,100,70,100

ctx.beginPath(); ctx.moveTo(50,20); ctx.arcTo(#val); ctx.stroke();