mapscript.classObj

class mapscript.classObj(layer: layerObj | None = None)

The CLASS object. Used for symbolization and classification information.

Overview

The classObj has the following relationships:

Examples

Class creation:

lyr = mapscript.layerObj()
lyr.name = 'foo'
c = mapscript.classObj(lyr)
assert c.thisown == 1
assert c.layer.name == lyr.name
assert c.numstyles == 0

Attributes

debug	int MS_TRUE or MS_FALSE - see DEBUG
group	char See GROUP
isfallback	int MS_TRUE or MS_FALSE use MS_TRUE if this class should be applied if and only if no other class is applicable
keyimage	char See KEYIMAGE
layer	layerObj immutable reference to the parent layer
leader	labelLeaderObj immutable see LEADER
maxscaledenom	double See MAXSCALEDENOM
metadata	hashTableObj immutable see METADATA
minfeaturesize	int See MINFEATURESIZE minimum feature size in pixels
minscaledenom	double See MINSCALEDENOM
name	char See NAME should be unique within a layer
numlabels	int immutable number of labels for class
numstyles	int immutable number of styles for class
refcount	int immutable number of references to this object
sizeunits	int Supersedes layer's sizeunits and applies to all styles and labels - see LAYER SIZEUNITS
status	int MS_ON or MS_OFF - draw features of this class or do not - see STATUS
template	char See TEMPLATE
thisown	The membership flag
title	char See TITLE
validation	hashTableObj immutable see VALIDATION

Methods

__init__(layer: layerObj | None = None)

Create a new child classObj instance at the tail (highest index) of the class array of the parent_layer. A class can be created outside the context of a parent layer by omitting the layerObj constructor argument

addLabel(label: labelObj) → int

Add a labelObj to the classObj and return its index in the labels array

clone() → classObj

Return an independent copy of the class without a parent layer

convertToString() → char

Output the CLASS as a Mapfile string

createLegendIcon(map: mapObj, layer: layerObj, width: int, height: int) → imageObj

Draw and return a new legend icon

drawLegendIcon(map: mapObj, layer: layerObj, width: int, height: int, dstImage: imageObj, dstX: int, dstY: int) → int

Draw the legend icon onto image at dstx, dsty. Returns MS_SUCCESS or MS_FAILURE

getExpressionString() → char

Return a string representation of the EXPRESSION enclosed in the quote characters appropriate to the expression type

getLabel(i: int) → labelObj

Return a reference to the labelObj at index in the labels array

getStyle(i: int) → styleObj

Return a reference to the styleObj at index in the styles array

getTextString() → char

Return a string representation of TEXT

insertStyle(style: styleObj, index: int = -1) → int

Insert a copy of style into the styles array at index index Default is -1, or the end of the array. Returns the index at which the style was inserted.

moveStyleDown(index: int) → int

Swap the styleObj at index with the styleObj at index + 1

moveStyleUp(index: int) → int

Swap the styleObj at index with the styleObj at index - 1

removeLabel(index: int) → labelObj

Remove the labelObj at index from the labels array and return a reference to the labelObj. numlabels is decremented, and the array is updated

removeStyle(index: int) → styleObj

Remove the styleObj at index from the styles array and return a copy.

setExpression(expression: char) → int

Set EXPRESSION string where expression is a MapServer regular, logical or string expression. Returns MS_SUCCESS or MS_FAILURE

setText(text: char) → int

Set TEXT string where text is a MapServer text expression. Returns MS_SUCCESS or MS_FAILURE

updateFromString(snippet: char) → int

Update a class from a string snippet. Returns MS_SUCCESS or MS_FAILURE