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FallText.java
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FallText.java
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package com.hanks.htextview.animatetext;
import android.animation.ValueAnimator;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.OvershootInterpolator;
import com.hanks.htextview.util.CharacterUtils;
/**
* Created by hanks on 15-12-14.
*/
public class FallText extends HText {
private float charTime = 400;
private int mostCount = 20;
private float mTextHeight = 0;
private float progress ;
private OvershootInterpolator interpolator;
@Override protected void initVariables() {
interpolator = new OvershootInterpolator();
}
@Override protected void animateStart(CharSequence text) {
int n = mText.length();
n = n <= 0 ? 1 : n;
long duration = (long) (charTime + charTime / mostCount * (n - 1));
ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, duration).setDuration(duration);
valueAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override public void onAnimationUpdate(ValueAnimator animation) {
progress = (float) animation.getAnimatedValue();
mHTextView.invalidate();
}
});
valueAnimator.start();
}
@Override protected void animatePrepare(CharSequence text) {
Rect bounds = new Rect();
mPaint.getTextBounds(mText.toString(), 0, mText.length(), bounds);
mTextHeight = bounds.height();
}
@Override protected void drawFrame(Canvas canvas) {
float offset = startX;
float oldOffset = oldStartX;
int maxLength = Math.max(mText.length(), mOldText.length());
for (int i = 0; i < maxLength; i++) {
// draw old text
if (i < mOldText.length()) {
//
float percent = progress / (charTime + charTime / mostCount * (mText.length() - 1));
mOldPaint.setTextSize(mTextSize);
int move = CharacterUtils.needMove(i, differentList);
if (move != -1) {
mOldPaint.setAlpha(255);
float p = percent * 2f;
p = p > 1 ? 1 : p;
float distX = CharacterUtils.getOffset(i, move, p, startX, oldStartX, gaps, oldGaps);
canvas.drawText(mOldText.charAt(i) + "", 0, 1, distX, startY, mOldPaint);
} else {
mOldPaint.setAlpha(255);
float centerX = oldOffset + oldGaps[i] / 2;
float width = mOldPaint.measureText(mOldText.charAt(i) + "");
float p = percent * 1.4f;
p = p > 1 ? 1 : p;
p = interpolator.getInterpolation(p);
double angle = (1 - p) * (Math.PI);
if (i % 2 == 0) {
angle = (p * Math.PI) + Math.PI;
}
float disX = centerX + (float) (width / 2 * Math.cos(angle));
float disY = startY + (float) (width / 2 * Math.sin(angle));
mOldPaint.setStyle(Paint.Style.STROKE);
Path path = new Path();
path.moveTo(disX, disY);
// (m+x)/2=a ,x=2a-m
// (n+y)/2=b ,y=2b-n
path.lineTo(2 * centerX - disX, 2 * startY - disY);
if (percent <= 0.7) {
canvas.drawTextOnPath(mOldText.charAt(i) + "", path, 0, 0, mOldPaint);
} else {
float p2 = (float) ((percent - 0.7) / 0.3f);
mOldPaint.setAlpha((int) ((1 - p2) * 255));
float y = (float) ((p2) * mTextHeight);
Path path2 = new Path();
path2.moveTo(disX, disY + y);
path2.lineTo(2 * centerX - disX, 2 * startY - disY + y);
canvas.drawTextOnPath(mOldText.charAt(i) + "", path2, 0, 0, mOldPaint);
}
}
oldOffset += oldGaps[i];
}
// draw new text
if (i < mText.length()) {
if (!CharacterUtils.stayHere(i, differentList)) {
int alpha = (int) (255f / charTime * (progress - charTime * i / mostCount));
alpha = alpha > 255 ? 255 : alpha;
alpha = alpha < 0 ? 0 : alpha;
float size = mTextSize * 1f / charTime * (progress - charTime * i / mostCount);
size = size > mTextSize ? mTextSize : size;
size = size < 0 ? 0 : size;
mPaint.setAlpha(alpha);
mPaint.setTextSize(size);
float width = mPaint.measureText(mText.charAt(i) + "");
canvas.drawText(mText.charAt(i) + "", 0, 1, offset + (gaps[i] - width) / 2, startY, mPaint);
}
offset += gaps[i];
}
}
}
}