How to use android.graphics

public RadarChartRenderer(RadarChart chart, ChartAnimator animator,
             ViewPortHandler viewPortHandler) {
  super(animator, viewPortHandler);
  mChart = chart;
  mHighlightPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mHighlightPaint.setStyle(Paint.Style.STROKE);
  mHighlightPaint.setStrokeWidth(2f);
  mHighlightPaint.setColor(Color.rgb(255, 187, 115));
  mWebPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mWebPaint.setStyle(Paint.Style.STROKE);
  mHighlightCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}

private void drawGlyph(Path path, Paint paint, Canvas canvas) {
 if (paint.getColor() == Color.TRANSPARENT) {
  return;
 }
 if (paint.getStyle() == Paint.Style.STROKE && paint.getStrokeWidth() == 0) {
  return;
 }
 canvas.drawPath(path, paint);
}

public RoundedDrawable(Bitmap bitmap, int cornerRadius, int margin) {
  this.cornerRadius = cornerRadius;
  this.margin = margin;
  bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
  mBitmapRect = new RectF (margin, margin, bitmap.getWidth() - margin, bitmap.getHeight() - margin);
  
  paint = new Paint();
  paint.setAntiAlias(true);
  paint.setShader(bitmapShader);
  paint.setFilterBitmap(true);
  paint.setDither(true);
}

 private Bitmap createSolidRedBitmap(int width, int height) {
  Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(result);
  Paint paint = new Paint();
  paint.setColor(Color.RED);
  Rect rect = new Rect(0, 0, width, height);
  canvas.drawRect(rect, paint);
  return result;
 }
}

private Bitmap createBitmapWithRedCircle(int width, int height) {
 int minEdge = Math.min(width, height);
 float radius = minEdge / 2f;
 Bitmap result = Bitmap.createBitmap(minEdge, minEdge, Bitmap.Config.ARGB_8888);
 result.setHasAlpha(true);
 Canvas canvas = new Canvas(result);
 Paint paint = new Paint();
 paint.setAntiAlias(true);
 paint.setColor(Color.RED);
 canvas.drawCircle(radius, radius, radius, paint);
 return result;
}

public BarChartRenderer(BarDataProvider chart, ChartAnimator animator,
            ViewPortHandler viewPortHandler) {
  super(animator, viewPortHandler);
  this.mChart = chart;
  mHighlightPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mHighlightPaint.setStyle(Paint.Style.FILL);
  mHighlightPaint.setColor(Color.rgb(0, 0, 0));
  // set alpha after color
  mHighlightPaint.setAlpha(120);
  mShadowPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mShadowPaint.setStyle(Paint.Style.FILL);
  mBarBorderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mBarBorderPaint.setStyle(Paint.Style.STROKE);
}

public LineChartRenderer(LineDataProvider chart, ChartAnimator animator,
             ViewPortHandler viewPortHandler) {
  super(animator, viewPortHandler);
  mChart = chart;
  mCirclePaintInner = new Paint(Paint.ANTI_ALIAS_FLAG);
  mCirclePaintInner.setStyle(Paint.Style.FILL);
  mCirclePaintInner.setColor(Color.WHITE);
}

protected void drawWave(Canvas canvas, int width) {
  //重置画笔
  mPath.reset();
  //绘制贝塞尔曲线
  mPath.lineTo(0, mWaveTop);
  mPath.quadTo(mWaveOffsetX >= 0 ? (mWaveOffsetX) : width / 2, mWaveTop + mWaveHeight, width, mWaveTop);
  mPath.lineTo(width, 0);
  mPaint.setColor(mPrimaryColor);
  canvas.drawPath(mPath, mPaint);
}

 private Bitmap createRect(int color, int width, int height, Bitmap.Config config) {
  final Bitmap result = Bitmap.createBitmap(width, height, config);
  Canvas canvas = new Canvas(result);
  canvas.drawColor(color);
  return result;
 }
}

public static Path createPath(PointF startPoint, PointF endPoint, PointF cp1, PointF cp2) {
 Path path = new Path();
 path.moveTo(startPoint.x, startPoint.y);
 if (cp1 != null  && cp2 != null && (cp1.length() != 0 || cp2.length() != 0)) {
  path.cubicTo(
    startPoint.x + cp1.x, startPoint.y + cp1.y,
    endPoint.x + cp2.x, endPoint.y + cp2.y,
    endPoint.x, endPoint.y);
 } else {
  path.lineTo(endPoint.x, endPoint.y);
 }
 return path;
}

private void drawCharacter(char[] character, Paint paint, Canvas canvas) {
 if (paint.getColor() == Color.TRANSPARENT) {
  return;
 }
 if (paint.getStyle() == Paint.Style.STROKE && paint.getStrokeWidth() == 0) {
  return;
 }
 canvas.drawText(character, 0, 1, 0, 0, paint);
}

/**
 * Returns the Android ICS holo blue light color.
 *
 * @return
 */
public static int getHoloBlue() {
  return Color.rgb(51, 181, 229);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}

@Override
public void drawValue(Canvas c, String valueText, float x, float y, int color) {
  mValuePaint.setColor(color);
  c.drawText(valueText, x, y, mValuePaint);
}