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Timed integer counter. More...
#include <Inventor/engines/SoTimeCounter.h>
Public Member Functions | |
SoTimeCounter () | |
Constructor. | |
Static Public Member Functions | |
static void | initClass () |
Initializes base engine class. | |
Public Attributes | |
Inputs | |
SoSFShort | min |
Minimum value for the counter. | |
SoSFShort | max |
Maximum value for the counter. | |
SoSFShort | step |
Counter step value. | |
SoSFBool | on |
Counter pauses if this is set to FALSE. | |
SoSFFloat | frequency |
Number of min -to-max cycles per second. | |
SoMFFloat | duty |
Duty cycle values. | |
SoSFTime | timeIn |
Running time. | |
SoSFTrigger | syncIn |
Restart at the beginning of the cycle. | |
SoSFShort | reset |
Reset the counter to the specified value. | |
Outputs | |
SoEngineOutput | output |
Counts min -to-max , in step increments. | |
SoEngineOutput | syncOut |
Triggers at cycle start. | |
Protected Member Functions | |
virtual void | inputChanged (SoField *whichInput) |
This is called whenever the value of an input is changed. | |
virtual void | writeInstance (SoOutput *out) |
Writes instance to SoOutput. | |
virtual SbBool | readInstance (SoInput *in, unsigned short flags) |
Reads stuff into instance. |
This engine is a counter that outputs numbers, starting at a minimum value, increasing by a step value, and ending with a number that does not exceed the maximum value. When the maximum number is reached, it starts counting from the beginning again.
The difference between this engine and the SoCounter engine, is that this engine also has a timeIn input, which allows the counting cycles to be timed. This engine counts automatically over time; it does not need to be triggered to go to the next step. By default, the timeIn input is connected to the realTime global field. It can, however, be connected to any time source.
The frequency input field controls how many min-to-max cycles are performed per second. For example, a frequency value of 0.5 means that it will take 2 seconds to complete a single min-to-max cycle.
The steps in the count cycle do not necessarily all have the same duration. Using the duty input field, you can arbitrarily split the time period of the count cycle between the steps. For example, if there are 5 steps in the cycle, a duty input of (1., 2., 2., 2., 1.) will make the second, third, and fourth steps take twice as long as the first and last steps.
At any time the counter can be reset to a specific value. If you set the reset input field to a value, the engine will continue counting from there. Note that the counter will always output numbers based on the min , max and step values, and setting the reset value does not affect the those input fields. If the reset value is not a legal counter value, the counter will still behave as though it is:
If reset is greater than max, the counter is set to max. If reset is less than min, the counter is set to min. If reset is between step values, the counter is set to the lower step.
Each time a counting cycle is started, the syncOut output is triggered. This output can be used to synchronize some other event with the counting cycle. Other events can also synchronize the counter by triggering the syncIn input.
You can pause the engine, by setting the on input to FALSE, and it will stop updating the output field. When you turn off the pause, by setting on to TRUE, it will start counting again from where it left off.
Definition at line 148 of file SoTimeCounter.h.
SoTimeCounter::SoTimeCounter | ( | ) |
static void SoTimeCounter::initClass | ( | ) | [static] |
Reimplemented from SoEngine.
virtual void SoTimeCounter::inputChanged | ( | SoField * | whichField | ) | [protected, virtual] |
The default method does nothing. Subclasses can override this to detect when a specific field is changed.
Reimplemented from SoEngine.
virtual SbBool SoTimeCounter::readInstance | ( | SoInput * | in, |
unsigned short | flags | ||
) | [protected, virtual] |
Works around a problem with old files that contain explicit references to the default connection to realTime.
Reimplemented from SoEngine.
virtual void SoTimeCounter::writeInstance | ( | SoOutput * | out | ) | [protected, virtual] |
Takes care of not writing out connection to realTime that is created in constructor.
Reimplemented from SoEngine.
Definition at line 172 of file SoTimeCounter.h.
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