有人可以帮我这个忙吗? 当我有这样的贝塞尔曲线时: www.w3schools/code/tryit.asp?filename= FX0KJBP2EZ3S
Can someone help me with this: When I have a bezier curve like this: www.w3schools/code/tryit.asp?filename=FX0KJBP2EZ3S
P0(X) = 0 P0(Y) = 50 P1(X) = 100 P1(Y) = 25 P2(X) = 200 P2(Y) = 50并使贝塞尔曲线变小:
www.w3schools/code/tryit.asp ?filename = FX0KL478CRY4
由于距离P0.X和P2.X,P1较高.如何保持P1的高度始终保持在同一高度?
the P1 is higher due to the distance P0.X and P2.X. How can I keep the height of P1 so it is allways in the same height?
推荐答案要按比例缩小曲线(使形状相同但更小),您必须以相同的比例更改控制点的差异.因此,应将Y1-Y0更改为与(X2'-X0')/(X2-X0):25 / (200/50) = 6.25类似.整数:
To shrink curve proportionally (to make the same form but smaller) you have to change differences of control points in the same ratio. So Y1-Y0 should be changed similar to (X2'-X0')/(X2-X0) : 25 / (200/50) = 6.25. In integers:
ctx.quadraticCurveTo(25, 44, 50, 50);更多推荐
二次贝塞尔曲线数学
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