FTC Programming with ElectronVolts

StepTimer keeps track of how long it takes for something to execute. For example:

StepTimer stepTimer = new StepTimer("MATH");
stepTimer.start();
double result = doComplexMathCalculation(1, 2, 3); //replace this with your actual code.
stepTimer.log("Complex math calculation");

The output in the Android monitor would be:

01-02 03:04:05.678      901-234/? I/MATH: TIME: Complex math calculation: 567 ms

Here is an example from the image processing code:

stepTimer.start();
//save the raw camera image for logging
ImageUtil.saveImage(TAG, rgbaFrame, Imgproc.COLOR_RGBA2BGR, "00_camera", startTime);
stepTimer.log("save 00");

ftc/evlib/util/StepTimer.java

package ftc.evlib.util;

import android.util.Log;

/**
 * This file was made by the electronVolts, FTC team 7393
 * Date Created: 8/26/16
 *
 * Records and logs the time it takes to complete a certain step in an algorithm
 */
public class StepTimer {
    private final String tag;
    private long timer;

    /**
     * @param tag the tag to give to the android logging
     *            You can search for the tag in the logs to find messages generated by your code
     */
    public StepTimer(String tag) {
        this.tag = tag;
        start();
    }

    /**
     * Start a step
     */
    public void start() {
        timer = System.nanoTime();
    }

    /**
     * Log the name of the step and the time since it started
     *
     * @param message the name of the step
     */
    public void log(String message) {
        Log.i(tag, "TIME: " + message + ": " + String.valueOf(get()) + " ms");
    }

    /**
     * @return the time since the step started
     */
    public double get() {
        return (System.nanoTime() - timer) / 1000000.0;
    }
}