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from qgis.PyQt.QtCore import QCoreApplication
from qgis.core import (QgsProcessing,
QgsProcessingAlgorithm,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterFileDestination,
QgsProcessingParameterField,
QgsProcessingParameterString,
QgsProcessingParameterNumber,
QgsProcessingParameterBoolean)
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import math
class matplotlibScat(QgsProcessingAlgorithm):
INPUT = 'INPUT'
OUTPUT = 'OUTPUT'
X_VALUES = 'X_VALUES'
Y_VALUES = 'Y_VALUES'
X_MAX = 'X_MAX'
Y_MAX = 'Y_MAX'
FLIP_X = 'FLIP_X'
FLIP_Y = 'FLIP_Y'
COLOR = 'COLOR'
TITLE = 'TITLE'
X_LABEL = 'X_LABEL'
Y_LABEL = 'Y_LABEL'
def tr(self, string):
return QCoreApplication.translate('Processing', string)
def createInstance(self):
return matplotlibScat()
def name(self):
return 'Scatter Plot'
def displayName(self):
return self.tr('Scatter Plot')
def group(self):
return self.tr('matplotlib vector')
def groupId(self):
return 'matplotlib vector'
def shortHelpString(self):
return self.tr("Generates a scatter plot for two selected numeric attributes from an input layer.")
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterFeatureSource(
self.INPUT,
self.tr('Input layer'),
[QgsProcessing.TypeVectorAnyGeometry]
)
)
self.addParameter(QgsProcessingParameterFileDestination(
'OUTPUT',
self.tr('Plot Output File'),
'PNG Files (*.png)'
)
)
self.addParameter(
QgsProcessingParameterField(
self.X_VALUES,
self.tr('X Values'),
None,
self.INPUT,
QgsProcessingParameterField.Numeric
)
)
self.addParameter(
QgsProcessingParameterField(
self.Y_VALUES,
self.tr('Y Values'),
None,
self.INPUT,
QgsProcessingParameterField.Numeric
)
)
self.addParameter(
QgsProcessingParameterNumber(
self.X_MAX,
self.tr('X Max'),
type=QgsProcessingParameterNumber.Double,
optional=True
)
)
self.addParameter(
QgsProcessingParameterNumber(
self.Y_MAX,
self.tr('Y Max'),
type=QgsProcessingParameterNumber.Double,
optional=True
)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.FLIP_X,
self.tr('Flip X Axis'),
defaultValue=False
)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.FLIP_Y,
self.tr('Flip Y Axis'),
defaultValue=False
)
)
self.addParameter(
QgsProcessingParameterString(
self.COLOR,
self.tr('Color'),
defaultValue='blue'
)
)
self.addParameter(
QgsProcessingParameterString(
self.TITLE,
self.tr('Title'),
defaultValue=' '
)
)
self.addParameter(
QgsProcessingParameterString(
self.X_LABEL,
self.tr('X Label'),
defaultValue=' '
)
)
self.addParameter(
QgsProcessingParameterString(
self.Y_LABEL,
self.tr('Y Label'),
defaultValue=' '
)
)
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
x_field = self.parameterAsString(parameters, self.X_VALUES, context)
y_field = self.parameterAsString(parameters, self.Y_VALUES, context)
x_max = self.parameterAsDouble(parameters, self.X_MAX, context)
y_max = self.parameterAsDouble(parameters, self.Y_MAX, context)
flip_x = self.parameterAsBool(parameters, self.FLIP_X, context)
flip_y = self.parameterAsBool(parameters, self.FLIP_Y, context)
color = self.parameterAsString(parameters, self.COLOR, context)
title = self.parameterAsString(parameters, self.TITLE, context)
x_label = self.parameterAsString(parameters, self.X_LABEL, context)
y_label = self.parameterAsString(parameters, self.Y_LABEL, context)
output = self.parameterAsFileOutput(parameters, self.OUTPUT, context)
feedback.pushInfo(f"Source: {source}")
feedback.pushInfo(f"x_field: {x_field}")
feedback.pushInfo(f"y_field: {y_field}")
feedback.pushInfo(f"x_max: {x_max}")
feedback.pushInfo(f"y_max: {y_max}")
feedback.pushInfo(f"flip_x: {flip_x}")
feedback.pushInfo(f"flip_y: {flip_y}")
feedback.pushInfo(f"title: {title}")
feedback.pushInfo(f"x_label: {x_label}")
feedback.pushInfo(f"y_label: {y_label}")
feedback.pushInfo(f"output: {output}")
x_values = []
y_values = []
for feature in source.getFeatures():
try:
x = float(feature[x_field])
y = float(feature[y_field])
if not (math.isnan(x) or math.isnan(y)):
x_values.append(x)
y_values.append(y)
except Exception as e:
continue
feedback.pushInfo(f"x_values: {x_values}")
feedback.pushInfo(f"y_values: {y_values}")
try:
plt.scatter(x_values, y_values, color=color)
plt.xlim(0, x_max)
plt.ylim(0, y_max)
if flip_x:
plt.gca().invert_xaxis()
if flip_y:
plt.gca().invert_yaxis()
plt.title(title)
plt.xlabel(x_label)
plt.ylabel(y_label)
plt.savefig(output)
plt.close()
feedback.pushInfo(f"Scatter plot saved to {output}")
return {self.OUTPUT: output}
except Exception as e:
feedback.reportError(f"Error: {e}")
return {}