I'm doing text animation in Libgdx. Trying to do something like
font1 = new BitmapFont(Gdx.files.internal("fontLabel/fonty.fnt"), false);
font1.getRegion().getTexture()
.setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear);
touchPos = new Vector3();
listchar = new TextButton[pause.length()];
advances = new FloatArray();
post = new FloatArray();
font1.computeGlyphAdvancesAndPositions(pause, advances, post);
But computeGlyphAdvancesAndPositions
doesn't exit anymore, what to do?
EDIT
I read this blog post which says to use GlyphLayout
but I don't know how to do that? GlyphLayout
doesn't take the parameters I want to give
I want to do something like the animation in this video, the old source code is here But as stated above, it doesn't work anymore because of the section I highlighted.
package com.tntstudio.texteffect;
import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.math.Interpolation;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.actions.Actions;
import com.badlogic.gdx.scenes.scene2d.ui.TextButton;
import com.badlogic.gdx.scenes.scene2d.ui.TextButton.TextButtonStyle;
import com.badlogic.gdx.scenes.scene2d.utils.ClickListener;
import com.badlogic.gdx.utils.FloatArray;
public class TECore implements ApplicationListener {
private Stage stage;
private BitmapFont font;
private TextButton[] listchar;
private FloatArray post, advances;
private String text;
private static final float time = 0.5f, delay = 0.2f;
private static final float x = 200f, y = 200f;
@Override
public void create() {
stage = new Stage(800f, 480f, true);
font = new BitmapFont(Gdx.files.internal("data/texteffect.fnt"));
font.getRegion().getTexture()
.setFilter(TextureFilter.Linear, TextureFilter.Linear);
text = "manh phi libgdx";
listchar = new TextButton[text.length()];
advances = new FloatArray();
post = new FloatArray();
font.computeGlyphAdvancesAndPositions(text, advances, post);
final TextButtonStyle style = new TextButtonStyle();
style.font = font;
/*-------- List Text --------*/
for (int i = 0; i < text.length(); i++) {
listchar[i] = new TextButton(String.valueOf(text.charAt(i)), style);
listchar[i].setTransform(true);
listchar[i].setPosition(x + post.get(i), y);
listchar[i].setOrigin(advances.get(i) / 2,
listchar[i].getHeight() / 4);
stage.addActor(listchar[i]);
}
Gdx.input.setInputProcessor(stage);
/*-------- Drop Effect Adapter --------*/
TextButton drop = new TextButton("drop", style);
drop.setPosition(0, 10);
drop.addListener(new ClickListener() {
@Override
public void clicked(InputEvent event, float x, float y) {
dropText();
}
});
stage.addActor(drop);
/*-------- Spin effect Adapter --------*/
TextButton spin = new TextButton("spin", style);
spin.setPosition(0, 100f);
spin.addListener(new ClickListener() {
@Override
public void clicked(InputEvent event, float x, float y) {
spinText();
}
});
stage.addActor(spin);
/*-------- Appear effect Adapter --------*/
TextButton appear = new TextButton("appear", style);
appear.setPosition(0, 300f);
appear.addListener(new ClickListener() {
@Override
public void clicked(InputEvent event, float x, float y) {
appearText();
}
});
stage.addActor(appear);
}
// ///////////////////////////////////////////////////////////////
// Reset Param of a char in text
// ///////////////////////////////////////////////////////////////
private void resetText() {
for (int i = 0; i < text.length(); i++) {
listchar[i].setPosition(x + post.get(i), y);
listchar[i].setOrigin(advances.get(i) / 2,
listchar[i].getHeight() / 4);
listchar[i].setColor(0, 0, 0, 1);
listchar[i].setScale(1f);
}
}
private void dropText() {
resetText();
for (int i = 0; i < text.length(); i++) {
listchar[i].setY(y + 200f);
listchar[i].setColor(0, 0, 0, 0);
listchar[i].addAction(Actions.delay(
delay * i,
Actions.parallel(Actions.alpha(1, time), Actions.moveTo(x
+ post.get(i), y, time, Interpolation.bounceOut))));
}
}
private void spinText() {
resetText();
for (int i = 0; i < text.length(); i++) {
listchar[i].addAction(Actions.delay(delay * i,
Actions.rotateBy(360f, time * 5, Interpolation.elastic)));
}
}
private void appearText(){
resetText();
for (int i=0; i<text.length(); i++){
listchar[i].setScale(0f);
listchar[i].setColor(0, 0, 0, 0);
listchar[i].addAction(Actions.delay(delay*i, Actions.parallel(Actions.alpha(1, time), Actions.scaleTo(1, 1, time, Interpolation.swingOut))));
}
}
@Override
public void dispose() {
}
@Override
public void render() {
Gdx.gl.glClearColor(0, 0, 1, 1);
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
stage.act(Gdx.graphics.getDeltaTime());
stage.draw();
}
@Override
public void resize(int width, int height) {
}
@Override
public void pause() {
}
@Override
public void resume() {
}
}
Since version 1.5.6 of libGDX
, the method BitmapFont.computeGlyphAdvancesAndPositions
was removed in favor of GlyphLayout
.
BitmapFont.computeGlyphAdvancesAndPositions
returned 2 arrays containing the advances and positions of the characters of the given CharSequence
.
To retrieve the same information using GlyphLayout
:
create a GlyphLayout
object and set the desired font and text:
GlyphLayout layout = new GlyphLayout();
layout.setText(font, text);
the provided text will be splitted into "runs" based on newlines; in case there are no newlines the whole text will be stored in the first run:
GlyphRun run = layout.runs.get(0);
GlyphRun
contains xAdvances
which is comparable to the advances array returned by BitmapFont.computeGlyphAdvancesAndPositions
; the difference is that the first position of the array contains the X offset relative to the drawing position, while the actual advance width of the i-th
character is in the i-th + 1
element of the array:
float startingOffset = run.xAdvances.get(0);
float ithAdvance = run.xAdvances.get(i + 1);
unfortunately, the positions of the single characters of the text are not anymore readily available but we can obtain them by adding the advances of the previous characters:
float[] positions = new float[text.length()];
for (int i = 0; i < positions.length; i++) {
if (i == 0) {
// first position is the starting offset
positions[0] = run.xAdvances.get(0);
} else {
// current position is the previous position plus its advance
positions[i] = positions[i - 1] + run.xAdvances.get(i);
}
}
In conclusion:
advances.get(i)
is replaced by run.xAdvances.get(i + 1)
post.get(i)
is replaced by positions[i]
, obtained as showed before (or in an equivalent manner)