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79 lines
1.6 KiB
79 lines
1.6 KiB
1 year ago
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// WSBezier.m
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// Test
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//
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// Created by senro wang on 15/8/11.
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// Copyright (c) 2015年 王燊. All rights reserved.
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//
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#import "WSBezier.h"
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@implementation WSBezier
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- (instancetype)init{
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if (self = [super init]) {
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[self _initPoints];
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}
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return self;
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}
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- (void)_initPoints{
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WSPoint start;
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WSPoint first;
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WSPoint second;
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WSPoint end;
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start.x = 0;
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start.y = 0;
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first.x = 0;
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first.y = 0.57;
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second.x = 0.44;
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second.y = 1;
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end.x = 1;
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end.y = 1;
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self.wsStart = start;
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self.wsFirst = first;
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self.wsSecond = second;
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self.wsEnd = end;
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}
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//贝塞尔 －
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//y=y0·(1-t)³+3·y1·t·(1-t)²+3·y2·t²·(1-t)+y3·t³
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//x=x0·(1-t)³+3·x1·t·(1-t)²+3·x2·t²·(1-t)+x3·t³
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//贝塞尔的 四个 控制点
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//（0 ， 0 ） (0 , 0.57) (0.44 , 1 ) (1 ,1); //
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// 还可以 设置 ease in ， ease out ，ease inout ，以及spring动画 。 有需要 联系840787626@qq.com
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//推荐大家一个网站 － 在这里你可以随意diy 你的 动画曲线 －
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//http://labs.pufen.net/cubic-bezier/#0,.57,.44,1
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- (WSPoint)pointWithdt:(float )dt{
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WSPoint result;
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float t = 1 - dt;
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float tSqure = t * t;
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float tCube = t * tSqure;
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float dtSqure = dt * dt;
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float dtCube = dtSqure * dt;
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result.x = self.wsStart.x * tCube + 3 * self.wsFirst.x * dt * tSqure + 3 * self.wsSecond.x * dtSqure * t + self.wsEnd.x * dtCube;
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result.y = self.wsStart.y * tCube + 3 * self.wsFirst.y * dt * tSqure + 3 * self.wsSecond.y * dtSqure * t + self.wsEnd.y * dtCube;
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return result;
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}
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@end
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