Tutorial Objective
Shows how to use a RunnableAction to update a variable as part of a Sequence of Actions.
What you should be familiar with for this tutorial
- Create a Stage (See basic Image Tutorial)
- Create a Label using a Skin (See basic Label Tutorial)
- Create a TextButton (See basic Action Tutorial)
Code
Full Code available for download here or can be read below.
Main Class (MyGdxGame.java)
Explanation
You can use a RunnableAction to execute a bit of code as part of a sequence of Action.
RunnableAction updateLapCountAction = new RunnableAction();
updateLapCountAction.setRunnable(new Runnable() {
@Override
public void run () {
updateLapsCount(); // Whatever Action you want to execute
}
});
This action can be added to a SequenceAction, ParallelAction. So to run a RunnableAction after a bunch of other actions you could use:
SequenceAction overallSequence = new SequenceAction(); overallSequence.addAction(topLeftRightParallelAction); overallSequence.addAction(moveBottomRightAction); overallSequence.addAction(bottomLeftRightParallelAction); overallSequence.addAction(leftBottomTopParallelAction); overallSequence.addAction(updateLapCountAction); image.addAction(overallSequence);
Code
Full Code available for download here or can be read below.
public class MyGdxGame extends ApplicationAdapter {
private Stage stage;
private static int lapsCount;
private Label lapsLabel;
private Group lapsLabelContainer;
@Override
public void create () {
lapsCount = 3;
stage = new Stage(new ScreenViewport());
Skin skin = new Skin(Gdx.files.internal("skin/glassy-ui.json"));
Texture texture = new Texture(Gdx.files.absolute("image.jpg"));
int X_left = Gdx.graphics.getWidth() / 3 - texture.getWidth() / 2;
int X_right = Gdx.graphics.getWidth() * 2 / 3 - texture.getWidth() / 2;
int Y_top = Gdx.graphics.getHeight() * 2 / 3 - texture.getHeight() / 2;
int Y_bottom = Gdx.graphics.getHeight() / 3 - texture.getHeight() / 2;
Image image1 = new Image(texture);
image1.setPosition(X_left, Y_top);
image1.setOrigin(image1.getWidth() / 2, image1.getHeight() / 2);
stage.addActor(image1);
ParallelAction topLeftRightParallelAction = new ParallelAction();
topLeftRightParallelAction.addAction(Actions.moveTo(X_right, Y_top, 1, Interpolation.exp5Out));
topLeftRightParallelAction.addAction(Actions.scaleTo(2, 2, 1, Interpolation.exp5Out));
MoveToAction moveBottomRightAction = new MoveToAction();
moveBottomRightAction.setPosition(X_right, Y_bottom);
moveBottomRightAction.setDuration(1);
moveBottomRightAction.setInterpolation(Interpolation.smooth);
RunnableAction updateLapCountAction = new RunnableAction();
updateLapCountAction.setRunnable(new Runnable() {
@Override
public void run () {
updateLapsCount();
}
});
ParallelAction bottomLeftRightParallelAction = new ParallelAction();
bottomLeftRightParallelAction.addAction(Actions.moveTo(X_left, Y_bottom, 1, Interpolation.sineOut));
bottomLeftRightParallelAction.addAction(Actions.scaleTo(1, 1, 1));
ParallelAction leftBottomTopParallelAction = new ParallelAction();
leftBottomTopParallelAction.addAction(Actions.moveTo(X_left, Y_top, 1, Interpolation.swingOut));
leftBottomTopParallelAction.addAction(Actions.rotateBy(90, 1));
SequenceAction overallSequence = new SequenceAction();
overallSequence.addAction(updateLapCountAction);
overallSequence.addAction(topLeftRightParallelAction);
overallSequence.addAction(moveBottomRightAction);
overallSequence.addAction(bottomLeftRightParallelAction);
overallSequence.addAction(leftBottomTopParallelAction);
RepeatAction loopNbrAction = new RepeatAction();
loopNbrAction.setCount(lapsCount);
loopNbrAction.setAction(overallSequence);
lapsLabel = new Label(" Loop :", skin, "big-black");
lapsLabel.setPosition(0, 0);
lapsLabel.setSize(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
lapsLabel.setAlignment(Align.center);
lapsLabelContainer = new Group();
lapsLabelContainer.addActor(lapsLabel);
lapsLabelContainer.setOrigin(lapsLabel.getWidth() / 2, lapsLabel.getHeight() / 2);
stage.addActor(lapsLabelContainer);
RunnableAction completedAction = new RunnableAction();
completedAction.setRunnable(new Runnable() {
@Override
public void run () {
finished();
}
});
image1.addAction(Actions.sequence(loopNbrAction, completedAction));
}
private void updateLapsCount () {
lapsCount--;
lapsLabelContainer.setScale(0);
SequenceAction FadingSequenceAction = new SequenceAction();
FadingSequenceAction.addAction(Actions.fadeIn(1));
ParallelAction parallelAction = new ParallelAction();
lapsLabel.setText(" Laps : " + (lapsCount + 1));
FadingSequenceAction.addAction(Actions.fadeOut(2));
parallelAction.addAction(Actions.scaleBy(5, 5, 4));
parallelAction.addAction(FadingSequenceAction);
lapsLabelContainer.addAction(parallelAction);
}
private void finished () {
lapsLabelContainer.setScale(0);
SequenceAction FadingSequenceAction = new SequenceAction();
FadingSequenceAction.addAction(Actions.fadeIn(1));
ParallelAction parallelAction = new ParallelAction();
lapsLabel.setText(" Finished!");
// FadingSequenceAction.addAction(Actions.fadeOut(10));
parallelAction.addAction(Actions.rotateBy(360, 2));
parallelAction.addAction(Actions.scaleBy((float)1.2, (float)1.2, 3, Interpolation.bounce));
parallelAction.addAction(FadingSequenceAction);
lapsLabelContainer.addAction(parallelAction);
}
@Override
public void render () {
Gdx.gl.glClearColor(1, 1, 1, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
stage.act();
stage.draw();
}
}
LibGDX.info 