## Trendline class

Represents a trendline in a chart.

```go

type Trendline struct  {
	ptr unsafe.Pointer
}

```
## Constructors

| Method | Description |
| --- | --- |
|[NewTrendline](./newtrendline/) | Constructs from a parent object. | 

## Methods

| Method | Description |
| --- | --- |
|[IsNull](./isnull/) | Checks whether the implementation object is nullptr. | 
|[IsNameAuto](./isnameauto/) | Returns if Microsoft Excel automatically determines the name of the trendline. | 
|[SetIsNameAuto](./setisnameauto/) | Returns if Microsoft Excel automatically determines the name of the trendline. | 
|[GetType](./gettype/) | Returns the trendline type. | 
|[GetName](./getname/) | Returns the name of the trendline. | 
|[SetName](./setname/) | Returns the name of the trendline. | 
|[GetOrder](./getorder/) | Returns or sets the trendline order (an integer greater than 1) when the trendline type is Polynomial.The order must be between 2 and 6. | 
|[SetOrder](./setorder/) | Returns or sets the trendline order (an integer greater than 1) when the trendline type is Polynomial.The order must be between 2 and 6. | 
|[GetPeriod](./getperiod/) | Returns or sets the period for the moving-average trendline. | 
|[SetPeriod](./setperiod/) | Returns or sets the period for the moving-average trendline. | 
|[GetForward](./getforward/) | Returns or sets the number of periods (or units on a scatter chart) that the trendline extends forward.The number of periods must be greater than or equal to zero. | 
|[SetForward](./setforward/) | Returns or sets the number of periods (or units on a scatter chart) that the trendline extends forward.The number of periods must be greater than or equal to zero. | 
|[GetBackward](./getbackward/) | Returns or sets the number of periods (or units on a scatter chart) that the trendline extends backward.The number of periods must be greater than or equal to zero.If the chart type is column ,the number of periods must be between 0 and 0.5 | 
|[SetBackward](./setbackward/) | Returns or sets the number of periods (or units on a scatter chart) that the trendline extends backward.The number of periods must be greater than or equal to zero.If the chart type is column ,the number of periods must be between 0 and 0.5 | 
|[GetDisplayEquation](./getdisplayequation/) | Represents if the equation for the trendline is displayed on the chart (in the same data label as the R-squared value). Setting this property to True automatically turns on data labels. | 
|[SetDisplayEquation](./setdisplayequation/) | Represents if the equation for the trendline is displayed on the chart (in the same data label as the R-squared value). Setting this property to True automatically turns on data labels. | 
|[GetDisplayRSquared](./getdisplayrsquared/) | Represents if the R-squared value of the trendline is displayed on the chart (in the same data label as the equation). Setting this property to True automatically turns on data labels. | 
|[SetDisplayRSquared](./setdisplayrsquared/) | Represents if the R-squared value of the trendline is displayed on the chart (in the same data label as the equation). Setting this property to True automatically turns on data labels. | 
|[GetIntercept](./getintercept/) | Returns or sets the point where the trendline crosses the value axis. | 
|[SetIntercept](./setintercept/) | Returns or sets the point where the trendline crosses the value axis. | 
|[GetDataLabels](./getdatalabels/) | Represents the DataLabels object for the specified series. | 
|[GetLegendEntry](./getlegendentry/) | Gets the legend entry according to this trendline | 
|[GetCompoundType](./getcompoundtype/) | Specifies the compound line type | 
|[SetCompoundType](./setcompoundtype/) | Specifies the compound line type | 
|[GetDashType](./getdashtype/) | Specifies the dash line type | 
|[SetDashType](./setdashtype/) | Specifies the dash line type | 
|[GetCapType](./getcaptype/) | Specifies the ending caps. | 
|[SetCapType](./setcaptype/) | Specifies the ending caps. | 
|[GetJoinType](./getjointype/) | Specifies the joining caps. | 
|[SetJoinType](./setjointype/) | Specifies the joining caps. | 
|[GetBeginType](./getbegintype/) | Specifies an arrowhead for the begin of a line. | 
|[SetBeginType](./setbegintype/) | Specifies an arrowhead for the begin of a line. | 
|[GetEndType](./getendtype/) | Specifies an arrowhead for the end of a line. | 
|[SetEndType](./setendtype/) | Specifies an arrowhead for the end of a line. | 
|[GetBeginArrowLength](./getbeginarrowlength/) | Specifies the length of the arrowhead for the begin of a line. | 
|[SetBeginArrowLength](./setbeginarrowlength/) | Specifies the length of the arrowhead for the begin of a line. | 
|[GetEndArrowLength](./getendarrowlength/) | Specifies the length of the arrowhead for the end of a line. | 
|[SetEndArrowLength](./setendarrowlength/) | Specifies the length of the arrowhead for the end of a line. | 
|[GetBeginArrowWidth](./getbeginarrowwidth/) | Specifies the width of the arrowhead for the begin of a line. | 
|[SetBeginArrowWidth](./setbeginarrowwidth/) | Specifies the width of the arrowhead for the begin of a line. | 
|[GetEndArrowWidth](./getendarrowwidth/) | Specifies the width of the arrowhead for the end of a line. | 
|[SetEndArrowWidth](./setendarrowwidth/) | Specifies the width of the arrowhead for the end of a line. | 
|[GetThemeColor](./getthemecolor/) | Gets and sets the theme color. | 
|[SetThemeColor](./setthemecolor/) | Gets and sets the theme color. | 
|[GetColor](./getcolor/) | Represents the Color of the line. | 
|[SetColor](./setcolor/) | Represents the Color of the line. | 
|[GetTransparency](./gettransparency/) | Returns or sets the degree of transparency of the line as a value from 0.0 (opaque) through 1.0 (clear). | 
|[SetTransparency](./settransparency/) | Returns or sets the degree of transparency of the line as a value from 0.0 (opaque) through 1.0 (clear). | 
|[GetStyle](./getstyle/) | Represents the style of the line. | 
|[SetStyle](./setstyle/) | Represents the style of the line. | 
|[GetWeight](./getweight/) | Gets or sets the WeightType of the line. | 
|[SetWeight](./setweight/) | Gets or sets the WeightType of the line. | 
|[GetWeightPt](./getweightpt/) | Gets or sets the weight of the line in unit of points. | 
|[SetWeightPt](./setweightpt/) | Gets or sets the weight of the line in unit of points. | 
|[GetWeightPx](./getweightpx/) | Gets or sets the weight of the line in unit of pixels. | 
|[SetWeightPx](./setweightpx/) | Gets or sets the weight of the line in unit of pixels. | 
|[GetFormattingType](./getformattingtype/) | Gets or sets format type. | 
|[SetFormattingType](./setformattingtype/) | Gets or sets format type. | 
|[IsAutomaticColor](./isautomaticcolor/) | Indicates whether the color of line is automatic assigned. | 
|[IsVisible](./isvisible/) | Represents whether the line is visible. | 
|[SetIsVisible](./setisvisible/) | Represents whether the line is visible. | 
|[IsAuto](./isauto/) | Indicates whether this line style is auto assigned. | 
|[SetIsAuto](./setisauto/) | Indicates whether this line style is auto assigned. | 
|[GetGradientFill](./getgradientfill/) | Represents gradient fill. |