private static void OnMaxChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
IndicatorMeter owner = d as IndicatorMeter;
if (owner.Max <= owner.Min)
{
owner.Max = owner.Min;
return;
}
if (owner.Max < owner.IndicatorValue)
{
owner.IndicatorValue = owner.Max;
}
if (owner.Max < owner.RangeBarMax)
{
owner.RangeBarMax = owner.Max;
}
/* 属性更改后需要立刻重绘刻度 */
owner.DrawScale(owner.PrimaryScaleRaduisInner, owner.PrimaryScaleRadiusOuter, owner.PrimaryScaleCount, owner.MinorScaleRadiusInner, owner.MinorScaleRadiusOuter, owner.MinorScaleCount, owner.PrimaryScaleStartAngle, owner.PrimaryScaleEndAngle, owner.PrimaryScaleWitdh, owner.PrimaryScaleBackground);
// 更改Indicator Bar颜色
owner.ChangeIndicatorBarBackground();
}
private static void OnIndicatorBarPatternChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
IndicatorMeter owner = d as IndicatorMeter;
owner.IndicatorBarPattern.Sort(SortCompare);
owner.ChangeIndicatorBarBackground();
}
private static void OnIndicatorValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
double indicator_bar_angle;
IndicatorMeter owner = d as IndicatorMeter;
double value = (double)e.NewValue;
// 显示指示值文本
if (double.IsNaN(value))
{
owner.txt_Value.Text = "N/A";
indicator_bar_angle = 0; // 如果输入的值是double.NaN，则指示条指向最小值
}
else
{
if (value > owner.Max)
{
owner.IndicatorValue = owner.Max;
return;
}
if (value < owner.Min)
{
owner.IndicatorValue = owner.Min;
return;
}
owner.txt_Value.Text = value.ToString();
indicator_bar_angle = 280 * (owner.IndicatorValue - owner.Min) / (owner.Max - owner.Min); // 根据指示值计算指示条的角度
/* 如果 Min == Max，则会出现 Max - Min = 0 的情况，此时indicator_bar_angle == double.NaN */
if (double.IsNaN(indicator_bar_angle))
{
indicator_bar_angle = 0;
}
}
// 绘制Indicator Bar
owner.BeginIndicatorValueChangedAnimation(indicator_bar_angle);
// 更改Indicator Bar颜色
owner.ChangeIndicatorBarBackground();
}
private static void OnRangeBarMaxChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
IndicatorMeter owner = d as IndicatorMeter;
double max = (double)e.NewValue;
if (max > owner.Max)
{
owner.RangeBarMax = owner.Max;
return;
}
if (max < owner.Min)
{
owner.RangeBarMax = owner.RangeBarMin;
return;
}
double div = (max - owner.Min) / (owner.Max - owner.Min);
double angle = 280 * div;
owner.RangeBar.EndAngle = angle;
owner.ChangeIndicatorBarBackground();
}
private static void OnIndicatorBarBackgroundChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
IndicatorMeter owner = d as IndicatorMeter;
owner.ChangeIndicatorBarBackground();
}