public class DemoRotateGears extends PortableApplication {
/** A simple class for reading time */
class TimeFloat {
float hour;
float second;
float minute;
TimeFloat() {
String t[] = new SimpleDateFormat("HH:mm:ss").format(new Date()).split(":");
hour = Float.parseFloat(t[0]);
minute = Float.parseFloat(t[1]);
second = Float.parseFloat(t[2]);
}
float getSecondAngle() {
return (float) -(2 * Math.PI * second) / 60;
}
float getMinuteAngle() {
return (float) -(2 * Math.PI * minute) / 60;
}
float getHourAngle() {
return (float) -(2 * Math.PI * ((hour % 12) * 60 + minute)) / (12 * 60);
}
}
private World world = PhysicsWorld.getInstance();
/* Bitmaps */
private BitmapImage bitmapClock;
private BitmapImage bitmapSecond;
private BitmapImage bitmapMinute;
private BitmapImage bitmapHour;
/* Hands */
private PhysicsBox hand_second;
private PhysicsBox hand_minute;
private PhysicsBox hand_hour;
/* Motors */
PhysicsMotor motor_seconds;
PhysicsMotor motor_minutes;
private Vector2 CLOCK_CENTER = new Vector2(136.0f, 128.0f);
/* Hand speed */
private float MOTOR_SPEED_SECOND = (float) (-Math.PI / 58.5);
private float MOTOR_SPEED_MINUTE = (float) (-Math.PI / 60);
private DebugRenderer debugRenderer;
private boolean debug_rendering = false;
public DemoRotateGears() {
super(512, 256);
}
public static void main(String args[]) {
new DemoRotateGears();
}
@Override
public void onInit() {
/* Get time */
TimeFloat time = new TimeFloat();
/* Set title */
setTitle("Simple rotate gears demo, pim 2015");
/* Create a debug renderer */
debugRenderer = new DebugRenderer();
/* Load images */
bitmapClock = new BitmapImage("data/images/clock.png");
bitmapSecond = new BitmapImage("data/images/clock_second.png");
bitmapMinute = new BitmapImage("data/images/clock_minute.png");
bitmapHour = new BitmapImage("data/images/clock_hour.png");
/* Create the frame, the motors will be attached to it */
PhysicsStaticBox frame = new PhysicsStaticBox("frame", CLOCK_CENTER, 10, 10);
/* Create the hands, at the current system time */
hand_second = new PhysicsBox("seconds", CLOCK_CENTER, 10, 50, time.getSecondAngle());
hand_minute = new PhysicsBox("minutes", CLOCK_CENTER, 10, 40, time.getMinuteAngle());
hand_hour = new PhysicsBox("hours", CLOCK_CENTER, 10, 30, time.getHourAngle());
/* Prevent collision between hands */
hand_second.setCollisionGroup(-2);
hand_minute.setCollisionGroup(-2);
hand_hour.setCollisionGroup(-2);
/* Create the motors */
motor_seconds =
new PhysicsMotor(frame.getBody(), hand_second.getBody(), frame.getBody().getWorldCenter());
motor_minutes =
new PhysicsMotor(frame.getBody(), hand_minute.getBody(), frame.getBody().getWorldCenter());
/*
* This motor will only be used as a skeleton for the gear.
*/
PhysicsMotor motor_m2h =
new PhysicsMotor(frame.getBody(), hand_hour.getBody(), frame.getBody().getWorldCenter());
/*
* Create the gear between the minute hand and the hour hand
*/
GearJointDef gear_m2h = new GearJointDef();
/* Do the connections */
gear_m2h.bodyA = hand_minute.getBody();
gear_m2h.bodyB = hand_hour.getBody();
gear_m2h.joint1 = motor_minutes.getJoint();
gear_m2h.joint2 = motor_m2h.getJoint();
/*
* Negative ratio because the minute and hour hand rotates the same
* direction
*/
gear_m2h.ratio = -60;
world.createJoint(gear_m2h);
/*
* Start the clock, the second hand is running and the minute hand is
* stopped
*/
motor_seconds.initializeMotor(MOTOR_SPEED_SECOND, 1.0f, true);
motor_minutes.initializeMotor(0.0f, 1.0f, true);
System.out.println("click to switch debug/rendering mode");
}
@Override
public void onGraphicRender(GdxGraphics g) {
/* Update the world physics */
PhysicsWorld.updatePhysics();
/* Sync signal emulation using system time */
boolean sync_signal = new TimeFloat().second % 60.0 == 0.0;
/*
* Second hand logic
*
* Stop when vertical, start when sync_sygnal
*/
if (sync_signal) {
motor_seconds.setMotorSpeed(MOTOR_SPEED_SECOND);
} else {
double angle = -hand_second.getBody().getAngle() % (2 * Math.PI);
if (angle > 2 * Math.PI * 0.995 && motor_seconds.getSpeed() != 0.0) {
motor_seconds.setMotorSpeed(0.0f);
}
}
/*
* Minute hand logic
*
* Move from 1 minute when sync_signal
*/
if (sync_signal) {
motor_minutes.setMotorSpeed(MOTOR_SPEED_MINUTE);
} else {
motor_minutes.setMotorSpeed(0.0f);
}
/* Get the size of the window */
final int w = getWindowWidth();
final int h = getWindowHeight();
/* Clear the graphic to draw the new image */
g.clear();
if (debug_rendering) {
debugRenderer.render(world, g.getCamera().combined);
g.setColor(Color.WHITE);
} else {
/* Create a nice grey gradient for the background */
for (int i = 0; i <= h; i++) {
float c = 255 - i * 0.3f;
g.setColor(new Color(c / 255, c / 255, c / 255, 1.0f));
g.drawLine(0, h - i, w, h - i);
}
/* Draw the clock frame */
g.drawPicture(CLOCK_CENTER.x, CLOCK_CENTER.y, bitmapClock);
/* Draw the hands */
g.drawTransformedPicture(
CLOCK_CENTER.x,
CLOCK_CENTER.y,
(float) (Math.toDegrees(hand_hour.getBody().getAngle())),
1.0f,
bitmapHour);
g.drawTransformedPicture(
CLOCK_CENTER.x,
CLOCK_CENTER.y,
(float) (Math.toDegrees(hand_minute.getBody().getAngle())),
1.0f,
bitmapMinute);
g.drawTransformedPicture(
CLOCK_CENTER.x,
CLOCK_CENTER.y,
(float) (Math.toDegrees(hand_second.getBody().getAngle())),
1.0f,
bitmapSecond);
g.setColor(Color.BLACK);
}
/* Display time in text */
g.drawString(w - 200, h - 10, "Famous clock from\r\n" + "the Swiss Railways.");
g.drawString(w - 200, h - 80, displayTime());
g.drawSchoolLogo();
}
@Override
/** Change shape on click */
public void onClick(int x, int y, int button) {
debug_rendering = !debug_rendering;
}
private String displayTime() {
// Return the current time as a String (hours:minutes:seconds)
DateFormat df = new SimpleDateFormat("HH:mm:ss");
return "Current time: " + df.format(new Date());
}
}
@Override
public void onGraphicRender(GdxGraphics g) {
/* Update the world physics */
PhysicsWorld.updatePhysics();
/* Sync signal emulation using system time */
boolean sync_signal = new TimeFloat().second % 60.0 == 0.0;
/*
* Second hand logic
*
* Stop when vertical, start when sync_sygnal
*/
if (sync_signal) {
motor_seconds.setMotorSpeed(MOTOR_SPEED_SECOND);
} else {
double angle = -hand_second.getBody().getAngle() % (2 * Math.PI);
if (angle > 2 * Math.PI * 0.995 && motor_seconds.getSpeed() != 0.0) {
motor_seconds.setMotorSpeed(0.0f);
}
}
/*
* Minute hand logic
*
* Move from 1 minute when sync_signal
*/
if (sync_signal) {
motor_minutes.setMotorSpeed(MOTOR_SPEED_MINUTE);
} else {
motor_minutes.setMotorSpeed(0.0f);
}
/* Get the size of the window */
final int w = getWindowWidth();
final int h = getWindowHeight();
/* Clear the graphic to draw the new image */
g.clear();
if (debug_rendering) {
debugRenderer.render(world, g.getCamera().combined);
g.setColor(Color.WHITE);
} else {
/* Create a nice grey gradient for the background */
for (int i = 0; i <= h; i++) {
float c = 255 - i * 0.3f;
g.setColor(new Color(c / 255, c / 255, c / 255, 1.0f));
g.drawLine(0, h - i, w, h - i);
}
/* Draw the clock frame */
g.drawPicture(CLOCK_CENTER.x, CLOCK_CENTER.y, bitmapClock);
/* Draw the hands */
g.drawTransformedPicture(
CLOCK_CENTER.x,
CLOCK_CENTER.y,
(float) (Math.toDegrees(hand_hour.getBody().getAngle())),
1.0f,
bitmapHour);
g.drawTransformedPicture(
CLOCK_CENTER.x,
CLOCK_CENTER.y,
(float) (Math.toDegrees(hand_minute.getBody().getAngle())),
1.0f,
bitmapMinute);
g.drawTransformedPicture(
CLOCK_CENTER.x,
CLOCK_CENTER.y,
(float) (Math.toDegrees(hand_second.getBody().getAngle())),
1.0f,
bitmapSecond);
g.setColor(Color.BLACK);
}
/* Display time in text */
g.drawString(w - 200, h - 10, "Famous clock from\r\n" + "the Swiss Railways.");
g.drawString(w - 200, h - 80, displayTime());
g.drawSchoolLogo();
}