FTC Programming with ElectronVolts

The following is an example of how the Logger and FileUtil classes are used together in an OpMode to log values. The logs will appear in the phone storage in the FTC/logs folder.

This example uses guava to initialize lists, which we have left for alternative methods.

package org.firstinspires.ftc.teamcode.yr2016.opmodes;

import com.google.common.collect.ImmutableList;
import com.qualcomm.robotcore.eventloop.opmode.OpMode;
import com.qualcomm.robotcore.eventloop.opmode.TeleOp;

import ftc.electronvolts.util.InputExtractor;
import ftc.electronvolts.util.files.Logger;
import ftc.evlib.util.FileUtil;

/**
 * This file was made by the electronVolts, FTC team 7393
 * Date Created: 1/13/17
 */

@TeleOp(name = "LogTestOp")
public class LogTestOp extends OpMode {
    Logger logger = new Logger("log", ".csv", ImmutableList.of(
            new Logger.Column("gamepad1.left_stick_y", new InputExtractor<Float>() {
                @Override
                public Float getValue() {
                    return gamepad1.left_stick_y;
                }
            }),
            new Logger.Column("gamepad1.right_stick_y", new InputExtractor<Float>() {
                @Override
                public Float getValue() {
                    return gamepad1.right_stick_y;
                }
            })
    ));

    @Override
    public void init() {

    }

    @Override
    public void start() {
        logger.start(FileUtil.getLogsDir());
    }

    @Override
    public void loop() {
        logger.act();
    }

    @Override
    public void stop() {
        logger.stop();
    }
}

If you want to learn more about the library, check out the next chapter.