103 lines
3.4 KiB
Python
103 lines
3.4 KiB
Python
#!/usr/bin/env python3
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"""
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Standalone NodeGraphQT Math Node Example
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This example defines a custom "Math Node" that:
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- Uses two text inputs for numeric operands (via add_text_input)
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- Provides a combo box for operator selection (via add_combo_menu)
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- Offers a checkbox to enable/disable the operation (via add_checkbox)
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- Computes a result and updates its title accordingly.
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"""
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from NodeGraphQt import NodeGraph, BaseNode
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class MathNode(BaseNode):
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"""
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Math Node:
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- Operands: Two text inputs (Operand 1 and Operand 2)
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- Operator: Combo box to select 'Add', 'Subtract', 'Multiply', or 'Divide'
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- Enable: Checkbox to enable/disable the math operation
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- Output: Result of the math operation (if enabled)
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"""
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__identifier__ = 'example.math'
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NODE_NAME = 'Math Node'
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def __init__(self):
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super(MathNode, self).__init__()
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# Add two text inputs for operands.
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self.add_text_input('operand1', 'Operand 1', text='10')
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self.add_text_input('operand2', 'Operand 2', text='5')
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# Add a combo box for operator selection.
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self.add_combo_menu('operator', 'Operator', items=['Add', 'Subtract', 'Multiply', 'Divide'])
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# Add a checkbox to enable/disable the operation.
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self.add_checkbox('enable', 'Enable Operation', state=True)
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# Add an output port to transmit the result.
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self.add_output('Result')
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self.value = 0
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self.set_name("Math Node")
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self.process_input()
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def process_input(self):
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"""
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Gather values from the widgets, perform the math operation if enabled,
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update the node title, and send the result to connected nodes.
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"""
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try:
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op1 = float(self.get_property('operand1'))
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except (ValueError, TypeError):
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op1 = 0.0
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try:
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op2 = float(self.get_property('operand2'))
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except (ValueError, TypeError):
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op2 = 0.0
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operator = self.get_property('operator')
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enable = self.get_property('enable')
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if enable:
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if operator == 'Add':
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result = op1 + op2
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elif operator == 'Subtract':
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result = op1 - op2
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elif operator == 'Multiply':
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result = op1 * op2
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elif operator == 'Divide':
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result = op1 / op2 if op2 != 0 else 0.0
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else:
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result = 0.0
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else:
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result = 0.0
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self.value = result
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self.set_name(f"Result: {result}")
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output_port = self.output(0)
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if output_port and output_port.connected_ports():
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for connected_port in output_port.connected_ports():
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connected_node = connected_port.node()
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if hasattr(connected_node, 'receive_data'):
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connected_node.receive_data(result, source_port_name='Result')
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if __name__ == '__main__':
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import sys
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try:
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from PySide2.QtWidgets import QApplication
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except ImportError:
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from PySide6.QtWidgets import QApplication
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app = QApplication(sys.argv)
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graph = NodeGraph()
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graph.register_node(MathNode)
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node = graph.create_node('example.math.MathNode', name='Math Node')
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node.set_pos(100, 100)
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graph.widget.resize(1200, 800)
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graph.widget.setWindowTitle("NodeGraphQT Math Node Demo")
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graph.widget.show()
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sys.exit(app.exec_())
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