Android(安卓)曲线图的绘制示例代码

本文介绍了Android 曲线图的绘制示例代码，分享给大家，具体如下：

效果展示

效果展示.gif

使用方式

// 初始化数据表格相关with(mTableView) {  // 配置坐标系  setupCoordinator("日", "人", /*这里是横坐标的值*/0f, 5f, 10f, 15f, 20f, 25f, 30f)  // 添加曲线, 确保纵坐标的数值位数相等  addWave(ContextCompat.getColor(this@MainActivity, R.color.colorYellow), false,      0f, 10f, 30f, 54f, 30f, 100f, 10f)  addWave(ContextCompat.getColor(this@MainActivity, R.color.colorGreen), false,      0f, 30f, 20f, 20f, 46f, 25f, 5f)  addWave(ContextCompat.getColor(this@MainActivity, R.color.colorPink), false,      0f, 30f, 20f, 50f, 46f, 30f, 30f)  addWave(Color.parseColor("#8596dee9"), true,      0f, 15f, 10f, 10f, 40f, 20f, 5f)}

实现思路

横坐标是固定的, 纵坐标需要跟随曲线传入的数值去动态的调整
绘制坐标轴: 纵横交错的网格
根据用户传入坐标数值去绘制坐标轴上的数值
给X轴和Y轴添加单位信息
根据用户传入的具体的数值绘制曲线(这里不采用Bezier, 不容易精确的控制顶点的位置)
绘制填充效果
添加属性动画

代码实现

/** * Created by FrankChoo on 2017/12/29. * Email: frankchoochina@gmail.com * Version: 1.0 * Description: 表格自定义View */public class TableView extends View {  private List mWaves;// 数值集合  // 坐标轴的数值  private int mCoordinateYCount = 8;  private float[] mCoordinateXValues;// 外界传入  private float[] mCoordinateYValues;// 动态计算  // 坐标的单位  private String mXUnit;  private String mYUnit;  // 所有曲线中所有数据中的最大值  private float mGlobalMaxValue;// 用于确认是否需要调整坐标系  private Paint mCoordinatorPaint;  private Paint mTextPaint;  private Paint mWrapPaint;  // 坐标轴上描述性文字的空间大小  private int mTopUnitHeight;// 顶部Y轴单位高度  private int mBottomTextHeight;  private int mLeftTextWidth;  // 网格尺寸  private int mGridWidth, mGridHeight;  private float mAnimProgress;  public TableView(Context context) {    this(context, null);  }  public TableView(Context context, @Nullable AttributeSet attrs) {    this(context, attrs, 0);  }  public TableView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    init();    post(new Runnable() {      @Override      public void run() {        showAnimator();      }    });  }  private void init() {    // 初始化数据集合的容器    mWaves = new ArrayList<>();    // 坐标系的单位    mBottomTextHeight = dp2px(40);// X轴底部字体的高度    mLeftTextWidth = mBottomTextHeight;// Y轴左边字体的宽度    mTopUnitHeight = dp2px(30);// 顶部Y轴的单位    // 初始化坐标轴Paint    mCoordinatorPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);    mCoordinatorPaint.setColor(Color.LTGRAY);    // 初始化文本Paint    mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);    mTextPaint.setColor(Color.GRAY);    mTextPaint.setTextSize(sp2px(12));    // 初始化曲线Paint    mWrapPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);    mWrapPaint.setPathEffect(new CornerPathEffect(200f));  }  /**   * 配置坐标轴信息   *   * @param xUnit       X 轴的单位   * @param yUnit       Y 轴的单位   * @param coordinateXValues X 坐标轴上的数值   */  public void setupCoordinator(String xUnit, String yUnit, float... coordinateXValues) {    mXUnit = xUnit;    mYUnit = yUnit;    mCoordinateXValues = coordinateXValues;  }  /**   * 添加一条曲线, 确保与横坐标的数值对应   *   * @param color   * @param isCoverRegion   * @param values   */  public void addWave(int color, boolean isCoverRegion, float... values) {    mWaves.add(new WaveConfigData(color, isCoverRegion, values));    // 根据value的值去计算纵坐标的数值    float maxValue = 0;    for (float value : values) {      maxValue = Math.max(maxValue, value);    }    if (maxValue < mGlobalMaxValue) return;    mGlobalMaxValue = maxValue;    // 保证网格的数值都为 5 的倍数    float gridValue = mGlobalMaxValue / (mCoordinateYCount - 1);    if (gridValue % 5 != 0) {      gridValue += 5 - (gridValue % 5);    }    // 给纵坐标的数值赋值    mCoordinateYValues = new float[mCoordinateYCount];    for (int i = 0; i < mCoordinateYCount; i++) {      mCoordinateYValues[i] = i * gridValue;    }    invalidate();  }  @Override  protected void onDraw(Canvas canvas) {    drawCoordinate(canvas);    drawWrap(canvas);  }  public void showAnimator() {    ValueAnimator animator = ValueAnimator.ofFloat(0f, 1f).setDuration(1000);    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {      @Override      public void onAnimationUpdate(ValueAnimator animation) {        mAnimProgress = (float) animation.getAnimatedValue();        invalidate();      }    });    animator.start();  }  /**   * 绘制坐标系   */  private void drawCoordinate(Canvas canvas) {    Point start = new Point();    Point stop = new Point();    // 1. 绘制横轴线和纵坐标单位    int xLineCount = mCoordinateYValues.length;    mGridHeight = (getHeight() - getPaddingTop() - getPaddingBottom() - mBottomTextHeight - mTopUnitHeight) / (xLineCount - 1);    for (int i = 0; i < xLineCount; i++) {      start.x = getPaddingLeft() + mLeftTextWidth;      start.y = getHeight() - getPaddingBottom() - mBottomTextHeight - mGridHeight * i;      stop.x = getRight() - getPaddingRight();      stop.y = start.y;      // 绘制横轴线      canvas.drawLine(start.x, start.y, stop.x, stop.y, mCoordinatorPaint);      // 绘制纵坐标单位      if (i == 0) continue;      String drawText = String.valueOf((int) mCoordinateYValues[i]);      Paint.FontMetricsInt fontMetrics = mTextPaint.getFontMetricsInt();      float offsetY = ((fontMetrics.bottom - fontMetrics.top) / 2 + fontMetrics.bottom) / 2;      float baseLine = start.y + offsetY;      float left = getPaddingLeft() + mLeftTextWidth / 2 - mTextPaint.measureText(drawText) / 2;      canvas.drawText(drawText, left, baseLine, mTextPaint);      // 绘制Y轴单位      if (i == xLineCount - 1) {        drawText = mYUnit;        baseLine = getPaddingTop() + mTopUnitHeight / 2;        canvas.drawText(drawText, left, baseLine, mTextPaint);      }    }    // 2. 绘制纵轴线和横坐标单位    int yLineCount = mCoordinateXValues.length;    mGridWidth = (getWidth() - getPaddingLeft() - getPaddingRight() - mLeftTextWidth) / (yLineCount - 1);    for (int i = 0; i < yLineCount; i++) {      start.x = getPaddingTop() + mLeftTextWidth + mGridWidth * i;      start.y = getPaddingTop() + mTopUnitHeight;      stop.x = start.x;      stop.y = getHeight() - mBottomTextHeight - getPaddingBottom();      // 绘制纵轴线      canvas.drawLine(start.x, start.y, stop.x, stop.y, mCoordinatorPaint);      // 绘制横坐标单位      String drawText = String.valueOf((int) mCoordinateXValues[i]);      Paint.FontMetricsInt fontMetrics = mTextPaint.getFontMetricsInt();      float offsetY = ((fontMetrics.bottom - fontMetrics.top) / 2 + fontMetrics.bottom) / 2;      float baseLine = getHeight() - getPaddingBottom() - mBottomTextHeight / 2 + offsetY;      float left = start.x - mTextPaint.measureText(drawText) / 2;      // 绘制X轴单位      if (i == 0) {        drawText = mXUnit;        left = getPaddingLeft() + mLeftTextWidth / 2 - mTextPaint.measureText(drawText) / 2;      }      canvas.drawText(drawText, left, baseLine, mTextPaint);    }  }  /**   * 绘制曲线   */  private void drawWrap(Canvas canvas) {    canvas.clipRect(new RectF(        mLeftTextWidth,        getPaddingTop() + mTopUnitHeight,        (getRight() - getPaddingRight()) * mAnimProgress,        getHeight() - getPaddingBottom() - mBottomTextHeight)    );    float yHeight = mGridHeight * (mCoordinateYCount - 1);    for (WaveConfigData wave : mWaves) {      Path path = new Path();      path.moveTo(0, getHeight());      float maxY = mCoordinateYValues[mCoordinateYCount - 1];// Y轴坐标的最大值      for (int index = 1; index < wave.values.length; index++) {        path.lineTo(            mLeftTextWidth + mGridWidth * index,            getHeight() - getPaddingBottom() - mBottomTextHeight                - yHeight * (wave.values[index] / maxY)        );      }      if (wave.isCoverRegion) {        mWrapPaint.setStyle(Paint.Style.FILL);        path.lineTo(getRight() - getPaddingRight(), getHeight());        path.close();      } else {        mWrapPaint.setStyle(Paint.Style.STROKE);        mWrapPaint.setStrokeWidth(10);      }      mWrapPaint.setColor(wave.color);      canvas.drawPath(path, mWrapPaint);    }  }  private int dp2px(float dp) {    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,        dp, getResources().getDisplayMetrics());  }  private int sp2px(float sp) {    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,        sp, getResources().getDisplayMetrics());  }  public static class WaveConfigData {    int color;    boolean isCoverRegion;    float values[];    public WaveConfigData(int color, boolean isCoverRegion, float[] values) {      this.color = color;      this.isCoverRegion = isCoverRegion;      this.values = values;    }  }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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