項目中使用到的效果,效果圖如下:
代碼實現:
public class WaveView extends View {
private Paint mPaint, mCriclePaint, mTextPaint;
// 傾斜或旋轉、快速變化,當在屏幕上畫一條直線時, 橫豎不會出現鋸齒,
// 但是當斜着畫時, 就會出現鋸齒的效果,所以需要設置抗鋸齒
private DrawFilter mDrawFilter;
private int mTotalHeight, mTotalWidth;
private int mXoffset = 0;
private float[] mPointY;
private float[] mDaymicPointY;
private int currentIndex = 1;
private int currentColor=0xaa3bb6e7;
//波浪線移動速度
private static final int X_SPEED = 20;
private int percent;
public void setPercent(int percent) {
this.percent = percent;
}
public WaveView(Context context) {
super(context);
init();
}
public int getCurrentIndex() {
return currentIndex;
}
public void setCurrentIndex(int currentIndex) {
this.currentIndex = currentIndex;
if (currentIndex==1){
currentColor = 0xaa3bb6e7;
}else if(currentIndex==2){
currentColor = 0xaa3c3c3c;
}else if (currentIndex==3){
currentColor = 0xaa724527;
}
}
public WaveView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public WaveView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
//圖片線條(通用)的抗鋸齒需要另外設置
mDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
//實例化一個畫筆
mPaint = new Paint();
//去除畫筆鋸齒
mPaint.setAntiAlias(true);
//設置畫筆風格爲實線
mPaint.setStyle(Paint.Style.FILL);
//設置畫筆顏色
mPaint.setColor(Color.GREEN);
//實例化圓的畫筆
mCriclePaint = new Paint(mPaint);
mCriclePaint.setColor(Color.parseColor("#88dddddd"));
mCriclePaint.setAlpha(255);
//實例化文字畫筆
mTextPaint = new Paint();
mTextPaint.setAntiAlias(true);
}
LinearGradient linearGradient;
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//去除鋸齒
canvas.setDrawFilter(mDrawFilter);
runWave();
int canvasWidth = canvas.getWidth();
int canvasHeight = canvas.getHeight();
int layerId = canvas.saveLayer(0, 0, canvasWidth, canvasHeight, null, Canvas.ALL_SAVE_FLAG);
// canvas.drawCircle(mTotalWidth / 2, mTotalHeight / 2, mTotalWidth / 2, mCriclePaint);
//設置顏色混合模式
// mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
//高減去寬除以2使水波紋底部在圓底部,動態改變percent值,在Y軸上變化
//畫進度條
//aa3c3c3c
//aa724527
final int c = currentColor;
int colorSweep[] = {c,Color.TRANSPARENT};
//設置漸變色
linearGradient = new LinearGradient(0, mTotalHeight-percent*mTotalHeight/100-80,0,mTotalHeight, colorSweep, null, Shader.TileMode.MIRROR);
mPaint.setShader(linearGradient);
for (int i = 0; i < mTotalWidth; i++) {
canvas.drawLine(i, mTotalHeight - mDaymicPointY[i] - (mTotalHeight - mTotalWidth) / 2 - percent * mTotalWidth / 100, i, mTotalHeight - (mTotalHeight - mTotalWidth) / 2, mPaint);
}
// RoundLightBarView
//最後將畫筆去除Xfermode
// mPaint.setXfermode(null);
canvas.restoreToCount(layerId);
//改變兩條波紋的移動點
mXoffset += X_SPEED;
//如果已經移動到末尾處,則到頭重新移動
if (mXoffset > mTotalWidth) {
mXoffset = 0;
}
String text = percent + " ";
mTextPaint.setColor(Color.WHITE);
mTextPaint.setTextSize(180);
float textLength = mTextPaint.measureText(text);
int textY = mTotalHeight - percent * mTotalHeight / 100;
if (textY < 180) {
textY = 180;
}
if (textY > mTotalHeight - 80) {
textY = mTotalHeight - 80;
}
canvas.drawText(text, (mTotalWidth - textLength) / 2, textY, mTextPaint);
mTextPaint.setTextSize(90);
String aText = percent < 10 ? " %" : percent < 100 ? " %" : " %";
//4 9 13
canvas.drawText(aText, (mTotalWidth - textLength) / 2, textY, mTextPaint);
// LogUtils.d("totalWdith:"+mTotalWidth+"---totalH:"+mTotalHeight);
//引起view重繪
postInvalidateDelayed(300);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mTotalHeight = h;
mTotalWidth = w;
//數組的長度爲view的寬度
mPointY = new float[w];
mDaymicPointY = new float[w];
//這裏我們以view的總寬度爲週期,y = a * sin(2π) + b
for (int i = 0; i < mTotalWidth; i++) {
mPointY[i] = (float) (20 * (Math.sin(2 * Math.PI * i / w)));
}
}
private void runWave() {
// 超出屏幕的挪到前面,mXoffset表示第一條水波紋要移動的距離
int yIntelrval = mPointY.length - mXoffset;
//使用System.arraycopy方式重新填充第一條波紋的數據
System.arraycopy(mPointY, 0, mDaymicPointY, mXoffset, yIntelrval);
System.arraycopy(mPointY, yIntelrval, mDaymicPointY, 0, mXoffset);
}
}
實現原理:
1、首先波浪的繪製是很多個豎直的線,並通過正弦座標轉換座標實現。
2、漸變色通過設置畫筆LinearGradient實現。