com.rafaskoberg.gdx.typinglabel.effects.ShakeEffect Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of typing-label Show documentation

A libGDX Label that appears as if it was being typed in real time.

There is a newer version: 1.4.0


package com.rafaskoberg.gdx.typinglabel.effects;

import com.badlogic.gdx.graphics.g2d.BitmapFont.Glyph;
import com.badlogic.gdx.math.Interpolation;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.utils.FloatArray;
import com.rafaskoberg.gdx.typinglabel.TypingLabel;

/** Shakes the text in a random pattern. */
public class ShakeEffect extends Effect {
	private static final float DEFAULT_DISTANCE = 0.12f;
	private static final float DEFAULT_INTENSITY = 0.5f;

	private final FloatArray lastOffsets = new FloatArray();

	public float distance = 1; // How far the glyphs should move
	public float intensity = 1; // How fast the glyphs should move

	public ShakeEffect (TypingLabel label) {
		super(label);
	}

	@Override
	protected void onApply (Glyph glyph, int localIndex) {
		// Make sure we can hold enough entries for the current index
		if (localIndex >= lastOffsets.size / 2) {
			lastOffsets.setSize(lastOffsets.size + 16);
		}

		// Get last offsets
		float lastX = lastOffsets.get(localIndex * 2);
		float lastY = lastOffsets.get(localIndex * 2 + 1);

		// Calculate new offsets
		float x = getLineHeight() * distance * MathUtils.random(-1, 1) * DEFAULT_DISTANCE;
		float y = getLineHeight() * distance * MathUtils.random(-1, 1) * DEFAULT_DISTANCE;

		// Apply intensity
		float normalIntensity = MathUtils.clamp(intensity * DEFAULT_INTENSITY, 0, 1);
		x = Interpolation.linear.apply(lastX, x, normalIntensity);
		y = Interpolation.linear.apply(lastY, y, normalIntensity);

		// Apply fadeout
		float fadeout = calculateFadeout();
		x *= fadeout;
		y *= fadeout;
		x = Math.round(x);
		y = Math.round(y);

		// Store offsets for the next tick
		lastOffsets.set(localIndex * 2, x);
		lastOffsets.set(localIndex * 2 + 1, y);

		// Apply changes
		glyph.xoffset += x;
		glyph.yoffset += y;
	}

}