api:dk11:delphi:gisclassification.tgis_classificationpixel
Table of Contents
TGIS_ClassificationPixel class
DK11 for Delphi | GisClassification.TGIS_ClassificationPixel | Classes | Constructors | Methods | Properties
Class that enables performing advanced pixel data classification in the process of creating choropleth (thematic) maps.
Syntax
// Delphi type TGIS_ClassificationPixel = class( TGIS_ClassificationAbstract ) end;
// C++ Builder class PASCALIMPLEMENTATION TGIS_ClassificationPixel : public TGIS_ClassificationAbstract { };
Inheritance
Constructors
Methods
Inherited
Overrides
Protected
Private
| Name | Visibility | Description | |
|---|---|---|---|
| AddClassBreak | public | Adds a new class break. (Inherited from TGIS_ClassificationAbstract) |
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| Classify | public | Performs the classification. (Inherited from TGIS_ClassificationAbstract) |
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| Classify(TGIS_ParamsList) | public | Performs the classification and applies to defined ParamsList. (Inherited from TGIS_ClassificationAbstract) |
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| doCreate | protected | Internal constructor. (Inherited from TGIS_ClassificationAbstract) |
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| EstimateNumClasses | public | Performs the pre-classification and sets NumClasses property. (Inherited from TGIS_ClassificationAbstract) |
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| MustCalculateStatistics | public | If True, statistics from layer assigned to classification need to be calculated. (Inherited from TGIS_ClassificationAbstract) |
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Properties
Inherited
Protected
Private
| Name | Visibility | Description | |
|---|---|---|---|
| Band | public | Band from which values are used in classification. | |
| ClassBreaks | public | Computed class breaks. (Inherited from TGIS_ClassificationAbstract) |
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| ColorRamp | public | The color ramp that is used to assign colors for class breaks. (Inherited from TGIS_ClassificationAbstract) |
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| ColorRampName | public | The name of the built-in color ramp that is used to assign colors for class breaks. (Inherited from TGIS_ClassificationAbstract) |
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| EndColor | public | Ending color used to generate ramp for class breaks. (Inherited from TGIS_ClassificationAbstract) |
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| ForceStatisticsCalculation | public | Forces the calculation of layer statistics. (Inherited from TGIS_ClassificationAbstract) |
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| Interval | public | Class interval size; default is 1. (Inherited from TGIS_ClassificationAbstract) |
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| Layer | public | Layer assigned to object. (Inherited from TGIS_ClassificationAbstract) |
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| Method | public | Classification method; NaturalBreaks by default. (Inherited from TGIS_ClassificationAbstract) |
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| NumClasses | public | Number of classes; default is 5, max is 30. (Inherited from TGIS_ClassificationAbstract) |
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| ShowLegend | public | If True, features will be shown in legend panel. (Inherited from TGIS_ClassificationAbstract) |
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| StartColor | public | Starting color used to generate ramp for class breaks. (Inherited from TGIS_ClassificationAbstract) |
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| Target | public | Indicates the data to be used for classification. (Inherited from TGIS_ClassificationAbstract) |
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Remarks
Example
Pseudocode:
// while 'lyr' is opened raster layer classifier = new TGIS_Classification( lyr ); // select one of available classification methods classifier.Method = TGIS_ClassificationMethod.EqualInterval; // specify number of classes classifier.NumClasses = 5; // specify attribute field with numerical values classifier.Band = '1'; // check if layer's statistics require recalculation if classifier.MustCalculateStatistics then lyr.Statistics.Calculate ; // run classification process, visual properties will be applied automatically classifier.Classify ; // check generated class breaks values // class breaks count equals NumClasses + 1 for i from 0 to classifier.NumClasses value = classifier.ClassBreaks[i];
2024/05/31 20:42