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RainBowText.java
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RainBowText.java
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package com.hanks.htextview.animatetext;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Shader;
import com.hanks.htextview.util.DisplayUtils;
/**
* from http://wuxiaolong.me/2015/11/16/LinearGradientTextView/
* Created by hanks on 15/12/26.
*/
public class RainBowText extends HText {
private int mTextWidth;
private LinearGradient mLinearGradient;
private Matrix mMatrix;
private float mTranslate;
private int dx;
private int [] colors =
new int[]{0xFFFF2B22, 0xFFFF7F22, 0xFFEDFF22, 0xFF22FF22, 0xFF22F4FF, 0xFF2239FF, 0xFF5400F7};
@Override
protected void initVariables() {
mMatrix = new Matrix();
dx = DisplayUtils.dp2Px(7);
}
public void setColors(int colors[]){
this.colors = colors;
}
@Override
protected void animateStart(CharSequence text) {
mHTextView.invalidate();
}
@Override
protected void animatePrepare(CharSequence text) {
mTextWidth = (int) mPaint.measureText(mText, 0, mText.length());
mTextWidth = Math.max(DisplayUtils.dp2Px(100), mTextWidth);
if (mTextWidth > 0) {
mLinearGradient = new LinearGradient(0, 0, mTextWidth, 0,
colors, null, Shader.TileMode.MIRROR);
mPaint.setShader(mLinearGradient);
}
}
@Override
protected void drawFrame(Canvas canvas) {
if (mMatrix != null && mLinearGradient != null) {
mTranslate += dx;
mMatrix.setTranslate(mTranslate, 0);
mLinearGradient.setLocalMatrix(mMatrix);
canvas.drawText(mText, 0, mText.length(), startX, startY, mPaint);
mHTextView.postInvalidateDelayed(100);
}
}
}