How to generate function images in real time using tkinter control buttons and solve voltage and current update issues?

Use the tkinter button to draw function images in real time and solve the voltage and current update problem

This article discusses a circuit simulation program built using tkinter, which controls the switch through buttons and displays circuit voltage and current changes in real time. The program originally had two problems: the voltage and current update starts at time zero, rather than at time of button click; the switch button cannot effectively control the circuit's disconnection and closing. These problems will be analyzed and resolved below.

Problem analysis and solutions

1. Voltage and current update time point deviation

In the original code, toggle_manual_switch method obtains the current time index, but this index is not updated in time, resulting in the voltage and current being updated from the initial moment (0) every time the button is clicked. The time index needs to be updated synchronously in the update_plot method.

Solution:

 def toggle_manual_switch(self):
    """
    Switch the switch state, affecting the subsequent state """
    # Get the current time index (no modification is required here)
    current_index = int(self.current_time_index)

def update_plot(self, frame):
    self.simulator.calculate_circuit_response(frame)
    time = t[frame]
    # Update the current time index self.current_time_index = frame

2. Circuit switch control failure

In the calculate_circuit_response method, there is a problem with the voltage and current assignment after the switching state changes. The original code only assigns values ​​at a single point in time and cannot achieve continuous disconnection/closing effects. The voltage and current need to be updated to the end of the simulation.

Solution:

 def calculate_circuit_response(self, current_time_index):
    # Check if there is a switch toggle if current_time_index > self.previous_switch_time_index:
        # Check the change in switch state if self.switch_states[current_time_index] != self.switch_states[current_time_index - 1]:
            self.previous_switch_state = not self.previous_switch_state
            next_switch_index = current_time_index np.argmax(self.switch_states[current_time_index:] != self.switch_states[current_time_index])
            if not self.previous_switch_state: # switch off self.VoltageOverTime[current_time_index:] = 0
                self.CurrentOverTime[current_time_index:] = 0
            else: # Switch close self.VoltageOverTime[current_time_index:] = V_battery * np.ones_like(self.VoltageOverTime[current_time_index:])
                self.CurrentOverTime[current_time_index:] = V_battery / R_load * np.ones_like(self.CurrentOverTime[current_time_index:])
            # Update the last switch switch time index self.previous_switch_time_index = next_switch_index

Through the above modifications, the program will update the voltage and current from the button click moment and realize accurate circuit switching control. Note that this solution assumes that switch_states array correctly stores the change in switch state over time. The complete code needs to be adjusted according to the specific structure of the original program.

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