using System;
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using Microsoft.Windows.Forms.Animate;
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namespace Microsoft.Windows
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{
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/// <summary>
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/// 两段渐进动画动画
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/// </summary>
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public sealed class UIGradientAnimation : Animation<float>
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{
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private const float ANIMATION_DURATION = 500; //动画持续时间(毫秒)
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private const float FIRST_TIME = 0.5f * ANIMATION_DURATION; //第一段时间(毫秒)
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private const float FIRST_PERCENT = 0.875f; //第一段百分比
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private const float SECOND_TIME = ANIMATION_DURATION - FIRST_TIME; //第二段时间(毫秒)
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private const float SECOND_PERCENT = 1f - FIRST_PERCENT; //第二段百分比
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private float m_From;
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/// <summary>
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/// 获取或设置起点
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/// </summary>
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public float From
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{
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get { return this.m_From; }
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set { this.m_From = value; }
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}
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private float m_To;
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/// <summary>
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/// 获取或设置终点
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/// </summary>
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public float To
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{
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get { return this.m_To; }
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set { this.m_To = value; }
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}
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/// <summary>
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/// 构造函数
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/// </summary>
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public UIGradientAnimation()
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{
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}
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/// <summary>
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/// 获取当前滑动距离
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/// </summary>
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public override float Current
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{
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get
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{
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float distance = this.m_To - this.m_From;
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float escaped = (float)(DateTime.Now - this.StartTime).TotalMilliseconds;
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if (escaped < FIRST_TIME)//公式 第一段时间/第一段距离=流逝时间/移动距离
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return this.m_From + escaped / FIRST_TIME * distance * FIRST_PERCENT;
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if (escaped < ANIMATION_DURATION)//公式 第二段时间/第二段距离=(流逝时间-第一段时间)/(移动距离-第一段距离)
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return this.m_From + (escaped - FIRST_TIME) / SECOND_TIME * distance * SECOND_PERCENT + distance * FIRST_PERCENT;
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this.Stop();
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return this.m_To;
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}
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}
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/// <summary>
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/// 重新开始动画
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/// </summary>
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public void Next()
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{
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base.Start();
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}
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/// <summary>
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/// 释放资源
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/// </summary>
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/// <param name="disposing">释放托管资源为true,否则为false</param>
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protected override void Dispose(bool disposing)
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{
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}
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}
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}
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