Detecting Redraw

Detecting Redraw Events

The simulation window (SimView) will be redrawn whenever you:

resize the window,
change the zoom level,
navigate to a new module,
pan left, right, up, or down,
change an animation mode, or
click the ReDraw option under the View menu.

Any objects you have drawn by your models during a simulation, such as an XY-graph, will be erased by a redraw event. You can restore them by detecting the redraw events and re-initialing or redrawing your dynamic objects.

You can detect redraw events by monitoring the value of the following pre-defined global integer:

resizedraw_no

The resizedraw_no is changed (incremented) everytime there is a redraw event.

For example:

Suppose your model displays an XY-graph gadget. You might do the following:
DEFINE_THREAD: start_up { int old_redraw_number; plot_init( MY_NAME, "x-axis", "y-axis" ); plot_axis_x( MY_NAME, 0.0, 105.0, 0, Gold, Blue ); plot_axis_y( MY_NAME, 50.0, 250.0, 0, Gold, Blue ); /* Record the initial redraw-number. */ old_redraw_number = resizedraw_no; while (1) { DELAY(10.0); /* Periodically check for redraws. */ if (old_redraw_number != resizedraw_no) { /* Detected a redraw event. Restore graph. */ plot_init( MY_NAME, "x-axis", "y-axis" ); plot_axis_x( MY_NAME, 0.0, 105.0, 0, Gold, Blue ); plot_axis_y( MY_NAME, 50.0, 250.0, 0, Gold, Blue ); /* Update the redraw-number. */ old_redraw_number = resizedraw_no; } } } END_DEFINE_THREAD.