## Trendline Class |

Represents a trendline in a chart.

Inheritance Hierarchy

Syntax

The Trendline type exposes the following members.

Properties

Name | Description | |
---|---|---|

Backward |
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 and equal to zero.
If the chart type is column ,the number of periods must be between 0 and 0.5
| |

BeginArrowLength |
Specifies the length of the arrowhead for the begin of a line.
(Inherited from Line.) | |

BeginArrowWidth |
Specifies the width of the arrowhead for the begin of a line.
(Inherited from Line.) | |

BeginType |
Specifies an arrowhead for the begin of a line.
(Inherited from Line.) | |

CapType |
Specifies the ending caps.
(Inherited from Line.) | |

Color |
Represents the Color of the line.
(Inherited from Line.) | |

CompoundType |
Specifies the compound line type
(Inherited from Line.) | |

DashType |
Specifies the dash line type
(Inherited from Line.) | |

DataLabels |
Represents the DataLabels object for the specified ASeries.
| |

DisplayEquation |
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.
| |

DisplayRSquared |
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.
| |

EndArrowLength |
Specifies the length of the arrowhead for the end of a line.
(Inherited from Line.) | |

EndArrowWidth |
Specifies the width of the arrowhead for the end of a line.
(Inherited from Line.) | |

EndType |
Specifies an arrowhead for the end of a line.
(Inherited from Line.) | |

FormattingType |
Gets or sets format type.
(Inherited from Line.) | |

Forward |
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 and equal to zero.
| |

GradientFill |
Represents gradient fill.
(Inherited from Line.) | |

Intercept |
Returns or sets the point where the trendline crosses the value axis.
| |

IsAuto |
Indicates whether this line style is auto assigned.
(Inherited from Line.) | |

IsAutomaticColor |
Indicates whether the color of line is auotmatic assigned.
(Inherited from Line.) | |

IsNameAuto |
Returns if Microsoft Excel automatically determines the name of the trendline.
| |

IsVisible |
Represents whether the line is visible.
(Inherited from Line.) | |

JoinType |
Specifies the joining caps.
(Inherited from Line.) | |

LegendEntry |
Gets the legend entry according to this trendline
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Name |
Returns the name of the trendline.
| |

Order |
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.
| |

Period |
Returns or sets the period for the moving-average trendline.
| |

Style |
Represents the style of the line.
(Inherited from Line.) | |

ThemeColor |
Gets and sets the theme color.
(Inherited from Line.) | |

Transparency |
Returns or sets the degree of transparency of the line as a value from 0.0 (opaque) through 1.0 (clear).
(Inherited from Line.) | |

Type |
Returns the trendline type.
| |

Weight |
Gets or sets the WeightType of the line.
(Inherited from Line.) | |

WeightPt |
Gets or sets the weight of the line in unit of points.
(Inherited from Line.) | |

WeightPx |
Gets or sets the weight of the line in unit of pixels.
(Inherited from Line.) |

Methods

Name | Description | |
---|---|---|

Equals | (Inherited from Object.) | |

Finalize | (Inherited from Object.) | |

GetHashCode | (Inherited from Object.) | |

GetType | (Inherited from Object.) | |

MemberwiseClone | (Inherited from Object.) | |

ToString | (Inherited from Object.) |

Fields

Name | Description | |
---|---|---|

m_lineParent | (Inherited from Line.) |

Examples

[C#] //Instantiating a Workbook object Workbook workbook = new Workbook(); //Adding a new worksheet to the Excel object int sheetIndex = workbook.Worksheets.Add(); //Obtaining the reference of the newly added worksheet by passing its sheet index Worksheet worksheet = workbook.Worksheets[sheetIndex]; //Adding a sample value to "A1" cell worksheet.Cells["A1"].PutValue(50); //Adding a sample value to "A2" cell worksheet.Cells["A2"].PutValue(100); //Adding a sample value to "A3" cell worksheet.Cells["A3"].PutValue(150); //Adding a sample value to "A4" cell worksheet.Cells["A4"].PutValue(200); //Adding a sample value to "B1" cell worksheet.Cells["B1"].PutValue(60); //Adding a sample value to "B2" cell worksheet.Cells["B2"].PutValue(32); //Adding a sample value to "B3" cell worksheet.Cells["B3"].PutValue(50); //Adding a sample value to "B4" cell worksheet.Cells["B4"].PutValue(40); //Adding a sample value to "C1" cell as category data worksheet.Cells["C1"].PutValue("Q1"); //Adding a sample value to "C2" cell as category data worksheet.Cells["C2"].PutValue("Q2"); //Adding a sample value to "C3" cell as category data worksheet.Cells["C3"].PutValue("Y1"); //Adding a sample value to "C4" cell as category data worksheet.Cells["C4"].PutValue("Y2"); //Adding a chart to the worksheet int chartIndex = worksheet.Charts.Add(ChartType.Column, 5, 0, 15, 5); //Accessing the instance of the newly added chart Chart chart = worksheet.Charts[chartIndex]; //Adding NSeries (chart data source) to the chart ranging from "A1" cell to "B4" chart.NSeries.Add("A1:B4", true); //Setting the data source for the category data of NSeries chart.NSeries.CategoryData = "C1:C4"; //adding a linear trendline int index = chart.NSeries[0].TrendLines.Add(TrendlineType.Linear); Trendline trendline = chart.NSeries[0].TrendLines[index]; //Setting the custom name of the trendline. trendline.Name = "Linear"; //Displaying the equation on chart trendline.DisplayEquation = true; //Displaying the R-Squared value on chart trendline.DisplayRSquared = true; //Saving the Excel file workbook.Save("C:\\book1.xls"); [Visual Basic] 'Instantiating a Workbook object Dim workbook As Workbook = New Workbook() 'Adding a new worksheet to the Excel object Dim sheetIndex As Int32 = workbook.Worksheets.Add() 'Obtaining the reference of the newly added worksheet by passing its sheet index Dim worksheet As Worksheet = workbook.Worksheets(sheetIndex) 'Adding a sample value to "A1" cell worksheet.Cells("A1").PutValue(50) 'Adding a sample value to "A2" cell worksheet.Cells("A2").PutValue(100) 'Adding a sample value to "A3" cell worksheet.Cells("A3").PutValue(150) 'Adding a sample value to "A4" cell worksheet.Cells("A4").PutValue(200) 'Adding a sample value to "B1" cell worksheet.Cells("B1").PutValue(60) 'Adding a sample value to "B2" cell worksheet.Cells("B2").PutValue(32) 'Adding a sample value to "B3" cell worksheet.Cells("B3").PutValue(50) 'Adding a sample value to "B4" cell worksheet.Cells("B4").PutValue(40) 'Adding a sample value to "C1" cell as category data worksheet.Cells("C1").PutValue("Q1") 'Adding a sample value to "C2" cell as category data worksheet.Cells("C2").PutValue("Q2") 'Adding a sample value to "C3" cell as category data worksheet.Cells("C3").PutValue("Y1") 'Adding a sample value to "C4" cell as category data worksheet.Cells("C4").PutValue("Y2") 'Adding a chart to the worksheet Dim chartIndex As Int32 = worksheet.Charts.Add(ChartType.Column, 5, 0, 15, 5) 'Accessing the instance of the newly added chart Dim chart As Chart = worksheet.Charts(chartIndex) 'Adding NSeries (chart data source) to the chart ranging from "A1" cell to "B4" chart.NSeries.Add("A1:B4", True) 'Setting the data source for the category data of NSeries Chart.NSeries.CategoryData = "C1:C4" 'adding a linear trendline Dim index As Int32 = chart.NSeries(0).TrendLines.Add(TrendlineType.Linear) Dim trendline As Trendline = chart.NSeries(0).TrendLines(index) 'Setting the custom name of the trendline. trendline.Name = "Linear" 'Displaying the equation on chart trendline.DisplayEquation = True 'Displaying the R-Squared value on chart trendline.DisplayRSquared = True 'Saving the Excel file workbook.Save("C:\\book1.xls")

See Also