/// <summary>
/// 获取指定刻度类型的最小值
/// </summary>
/// <param name="tickType">刻度类型</param>
/// <returns>指定刻度类型的最小值</returns>
private double GetSpecifiedMinimumSizeByTickType(TimelineTickType tickType)
{
switch (tickType)
{
case TimelineTickType.Big:
return(BigTickMinimumSize);
case TimelineTickType.Medium:
return(MediumTickMinimumSize);
case TimelineTickType.Small:
return(SmallTickMinimumSize);
}
return(double.NaN);
}
/// <summary>
/// 根据刻度类型重新计算时间线刻度频度
/// </summary>
/// <param name="tickType">刻度类型</param>
/// <returns>刻度频度</returns>
private TimelineTickFrequency ReCalculateTimelineTickFrequency(TimelineTickType tickType)
{
// make separate passes for each tick size
var tickPixelExtentInSeconds = GetSpecifiedMinimumSizeByTickType(tickType) * (1 / PixelsPerSecond);
// find a tick frequency that fits with this size
foreach (var validFrequency in _validFrequencies)
{
if (validFrequency.Extent.TotalSeconds >= tickPixelExtentInSeconds)
{
return(validFrequency);
}
}
// couldn't find a tick frequency, could switch to N number of days here
return(null);
}
/// <summary>
/// 根据刻度频度和刻度类型计算刻度集合
/// </summary>
/// <param name="freq">刻度频度</param>
/// <param name="tickType">刻度类型</param>
private void CalculateTicks(TimelineTickFrequency freq, TimelineTickType tickType)
{
// if there is a viewport defined, then just generate
double spanExtentInSeconds; // 跨度范围 秒数
DateTime spanStart; // 跨度范围 开始时间
if (double.IsInfinity(ViewportExtent))
{
spanExtentInSeconds = (End - Start).TotalSeconds;
spanStart = Start;
}
else
{
spanStart = Start.AddSeconds(ViewportOffset * (1 / PixelsPerSecond));
spanExtentInSeconds = ViewportExtent * (1 / PixelsPerSecond);
}
double tickCount = spanExtentInSeconds / freq.Extent.TotalSeconds;
// calculate the first tick
var tick =
DateTime.MinValue.AddSeconds(
Math.Ceiling((spanStart - DateTime.MinValue).TotalSeconds / freq.Extent.TotalSeconds) * freq.Extent.TotalSeconds
);
for (int i = 0; i < tickCount; i++)
{
AddTick(
new TimelineTick()
{
Time = tick,
TickType = tickType
}
);
tick = tick.AddSeconds(freq.Extent.TotalSeconds);
}
}
/// <summary>
/// 获取指定刻度类型的最小值
/// </summary>
/// <param name="tickType">刻度类型</param>
/// <returns>指定刻度类型的最小值</returns>
private double GetSpecifiedMinimumSizeByTickType(TimelineTickType tickType)
{
switch (tickType)
{
case TimelineTickType.Big:
return BigTickMinimumSize;
case TimelineTickType.Medium:
return MediumTickMinimumSize;
case TimelineTickType.Small:
return SmallTickMinimumSize;
}
return double.NaN;
}
/// <summary>
/// 根据刻度类型重新计算时间线刻度频度
/// </summary>
/// <param name="tickType">刻度类型</param>
/// <returns>刻度频度</returns>
private TimelineTickFrequency ReCalculateTimelineTickFrequency(TimelineTickType tickType)
{
// make separate passes for each tick size
var tickPixelExtentInSeconds = GetSpecifiedMinimumSizeByTickType(tickType) * (1 / PixelsPerSecond);
// find a tick frequency that fits with this size
foreach (var validFrequency in _validFrequencies)
{
if (validFrequency.Extent.TotalSeconds >= tickPixelExtentInSeconds)
{
return validFrequency;
}
}
// couldn't find a tick frequency, could switch to N number of days here
return null;
}
/// <summary>
/// 根据刻度频度和刻度类型计算刻度集合
/// </summary>
/// <param name="freq">刻度频度</param>
/// <param name="tickType">刻度类型</param>
private void CalculateTicks(TimelineTickFrequency freq, TimelineTickType tickType)
{
// if there is a viewport defined, then just generate
double spanExtentInSeconds; // 跨度范围 秒数
DateTime spanStart; // 跨度范围 开始时间
if (double.IsInfinity(ViewportExtent))
{
spanExtentInSeconds = (End - Start).TotalSeconds;
spanStart = Start;
}
else
{
spanStart = Start.AddSeconds(ViewportOffset * (1 / PixelsPerSecond));
spanExtentInSeconds = ViewportExtent * (1 / PixelsPerSecond);
}
double tickCount = spanExtentInSeconds / freq.Extent.TotalSeconds;
// calculate the first tick
var tick =
DateTime.MinValue.AddSeconds(
Math.Ceiling((spanStart - DateTime.MinValue).TotalSeconds / freq.Extent.TotalSeconds) * freq.Extent.TotalSeconds
);
for (int i = 0; i < tickCount; i++)
{
AddTick(
new TimelineTick()
{
Time = tick,
TickType = tickType
}
);
tick = tick.AddSeconds(freq.Extent.TotalSeconds);
}
}
