kschappell/py-dvt-ate
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Use st.fragment for smooth dashboard updates

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Replace st.rerun() with @st.fragment decorator to prevent
full page reloads and eliminate UI greying out.
This commit is contained in:
Kai Chappell
2025-12-02 11:50:26 +00:00
parent 7c5953ea18
commit 6af12d895a
1 changed files with 120 additions and 141 deletions
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261
src/py_dvt_ate/app/dashboard/app.py
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@@ -18,8 +18,6 @@ HISTORY_SIZE = 500
# Simulation speed settings
DEFAULT_TIME_MULTIPLIER = 10.0 # 10x faster than real-time
STEPS_PER_UPDATE = 100 # Steps per UI refresh
UPDATE_INTERVAL_MS = 100 # Target UI refresh rate
@dataclass
@@ -89,124 +87,6 @@ def step_simulation() -> None:
history.power_dissipation.append(electrical.power_dissipation)
def display_thermal_chart() -> None:
"""Display temperature chart."""
history: SimulationHistory = st.session_state.history
if len(history.time) < 2:
st.info("Start the simulation to see temperature data")
return
chart_data = {
"Time (s)": list(history.time),
"Chamber": list(history.chamber_temp),
"Case": list(history.case_temp),
"Junction": list(history.junction_temp),
}
st.line_chart(
chart_data,
x="Time (s)",
y=["Chamber", "Case", "Junction"],
color=["#1f77b4", "#ff7f0e", "#d62728"],
)
def display_self_heating_panel() -> None:
"""Display self-heating demonstration panel."""
engine: PhysicsEngine = st.session_state.engine
history: SimulationHistory = st.session_state.history
thermal = engine.get_thermal_state()
electrical = engine.get_electrical_state()
# Calculate temperature rises
delta_t_jc = thermal.junction_temperature - thermal.case_temperature
delta_t_ca = thermal.case_temperature - thermal.chamber_temperature
col1, col2 = st.columns(2)
with col1:
st.markdown("#### Self-Heating Analysis")
# Display thermal resistance info
st.markdown(
f"""
| Parameter | Value |
|-----------|-------|
| Junction-Case Rise (ΔT_jc) | **{delta_t_jc:.2f} °C** |
| Case-Ambient Rise (ΔT_ca) | **{delta_t_ca:.2f} °C** |
| Power Dissipation | {electrical.power_dissipation * 1000:.1f} mW |
| θ_jc (junction-case) | 15 °C/W |
| θ_ca (case-ambient) | 5 °C/W |
"""
)
st.markdown(
"""
**Thermal Coupling:** The junction temperature rises above the case
temperature due to power dissipation. This is governed by:
`T_junction = T_case + P_diss × θ_jc`
Try increasing the load current or input voltage to see
self-heating effects!
"""
)
with col2:
st.markdown("#### Power Dissipation")
if len(history.time) < 2:
st.info("Start the simulation to see power data")
return
power_data = {
"Time (s)": list(history.time),
"Power (mW)": [p * 1000 for p in history.power_dissipation],
}
st.line_chart(
power_data,
x="Time (s)",
y="Power (mW)",
color="#2ca02c",
)
def display_current_state() -> None:
"""Display current simulation state metrics."""
engine: PhysicsEngine = st.session_state.engine
thermal = engine.get_thermal_state()
electrical = engine.get_electrical_state()
col1, col2, col3, col4 = st.columns(4)
with col1:
st.metric("Chamber Temp", f"{thermal.chamber_temperature:.2f} °C")
with col2:
st.metric("Case Temp", f"{thermal.case_temperature:.2f} °C")
with col3:
st.metric("Junction Temp", f"{thermal.junction_temperature:.2f} °C")
with col4:
st.metric("Output Voltage", f"{electrical.output_voltage:.4f} V")
col5, col6, col7, col8 = st.columns(4)
with col5:
st.metric("Input Voltage", f"{electrical.input_voltage:.2f} V")
with col6:
st.metric("Load Current", f"{electrical.load_current * 1000:.1f} mA")
with col7:
st.metric("Power Diss.", f"{electrical.power_dissipation * 1000:.2f} mW")
with col8:
st.metric(
"Sim Time",
f"{engine.simulation_time:.1f} s",
delta=f"{st.session_state.time_multiplier:.0f}× speed",
)
def display_controls() -> None:
"""Display simulation control panel in sidebar."""
engine: PhysicsEngine = st.session_state.engine
@@ -215,7 +95,9 @@ def display_controls() -> None:
# Start/Stop button
if st.session_state.running:
if st.sidebar.button("Stop Simulation", type="primary", use_container_width=True):
if st.sidebar.button(
"Stop Simulation", type="primary", use_container_width=True
):
st.session_state.running = False
st.rerun()
else:
@@ -223,6 +105,7 @@ def display_controls() -> None:
"Start Simulation", type="primary", use_container_width=True
):
st.session_state.running = True
st.session_state.last_update = time.time()
st.rerun()
# Reset button
@@ -241,7 +124,7 @@ def display_controls() -> None:
"Time Multiplier",
options=[1, 2, 5, 10, 20, 50, 100],
value=int(st.session_state.time_multiplier),
format_func=lambda x: f"{x}×",
format_func=lambda x: f"{x}x",
key="time_mult_slider",
)
st.session_state.time_multiplier = float(time_mult)
@@ -252,7 +135,7 @@ def display_controls() -> None:
# Temperature setpoint
st.sidebar.subheader("Thermal Chamber")
temp_setpoint = st.sidebar.slider(
"Temperature Setpoint (°C)",
"Temperature Setpoint (C)",
min_value=-40.0,
max_value=125.0,
value=25.0,
@@ -297,6 +180,117 @@ def display_controls() -> None:
engine.set_load_current(load_current_ma / 1000.0)
@st.fragment(run_every=0.1)
def simulation_display() -> None:
"""Fragment that displays and updates simulation state."""
engine: PhysicsEngine = st.session_state.engine
history: SimulationHistory = st.session_state.history
# Step simulation if running
if st.session_state.running:
step_simulation()
# Get current state
thermal = engine.get_thermal_state()
electrical = engine.get_electrical_state()
# Current state metrics
st.subheader("Current State")
col1, col2, col3, col4 = st.columns(4)
with col1:
st.metric("Chamber Temp", f"{thermal.chamber_temperature:.2f} C")
with col2:
st.metric("Case Temp", f"{thermal.case_temperature:.2f} C")
with col3:
st.metric("Junction Temp", f"{thermal.junction_temperature:.2f} C")
with col4:
st.metric("Output Voltage", f"{electrical.output_voltage:.4f} V")
col5, col6, col7, col8 = st.columns(4)
with col5:
st.metric("Input Voltage", f"{electrical.input_voltage:.2f} V")
with col6:
st.metric("Load Current", f"{electrical.load_current * 1000:.1f} mA")
with col7:
st.metric("Power Diss.", f"{electrical.power_dissipation * 1000:.2f} mW")
with col8:
status = "Running" if st.session_state.running else "Stopped"
st.metric(
"Sim Time",
f"{engine.simulation_time:.1f} s",
delta=f"{status} @ {st.session_state.time_multiplier:.0f}x",
)
# Temperature chart
st.subheader("Temperature History")
if len(history.time) < 2:
st.info("Start the simulation to see temperature data")
else:
chart_data = {
"Time (s)": list(history.time),
"Chamber": list(history.chamber_temp),
"Case": list(history.case_temp),
"Junction": list(history.junction_temp),
}
st.line_chart(
chart_data,
x="Time (s)",
y=["Chamber", "Case", "Junction"],
color=["#1f77b4", "#ff7f0e", "#d62728"],
)
# Self-heating demonstration
st.subheader("Self-Heating Demonstration")
delta_t_jc = thermal.junction_temperature - thermal.case_temperature
delta_t_ca = thermal.case_temperature - thermal.chamber_temperature
col1, col2 = st.columns(2)
with col1:
st.markdown("#### Self-Heating Analysis")
st.markdown(
f"""
| Parameter | Value |
|-----------|-------|
| Junction-Case Rise (dT_jc) | **{delta_t_jc:.2f} C** |
| Case-Ambient Rise (dT_ca) | **{delta_t_ca:.2f} C** |
| Power Dissipation | {electrical.power_dissipation * 1000:.1f} mW |
| theta_jc (junction-case) | 15 C/W |
| theta_ca (case-ambient) | 5 C/W |
"""
)
st.markdown(
"""
**Thermal Coupling:** The junction temperature rises above the case
temperature due to power dissipation. This is governed by:
`T_junction = T_case + P_diss x theta_jc`
Try increasing the load current or input voltage to see
self-heating effects!
"""
)
with col2:
st.markdown("#### Power Dissipation")
if len(history.time) < 2:
st.info("Start the simulation to see power data")
else:
power_data = {
"Time (s)": list(history.time),
"Power (mW)": [p * 1000 for p in history.power_dissipation],
}
st.line_chart(
power_data,
x="Time (s)",
y="Power (mW)",
color="#2ca02c",
)
def main() -> None:
"""Main entry point for the Streamlit dashboard."""
st.set_page_config(
@@ -315,26 +309,11 @@ def main() -> None:
init_session_state()
# Sidebar controls
# Sidebar controls (static - doesn't need fragment)
display_controls()
# Current state display
st.subheader("Current State")
display_current_state()
# Temperature chart
st.subheader("Temperature History")
display_thermal_chart()
# Self-heating demonstration
st.subheader("Self-Heating Demonstration")
display_self_heating_panel()
# Auto-refresh when running
if st.session_state.running:
step_simulation()
time.sleep(0.05) # Small delay to prevent UI thrashing
st.rerun()
# Dynamic simulation display (uses fragment for smooth updates)
simulation_display()
if __name__ == "__main__":