CanvasView.java 文件源码

/**
 * This method creates the instance of Paint.
 * In addition, this method sets styles for Paint.
 *
 * @return paint This is returned as the instance of Paint
 */
private Paint createPaint() {
  Paint paint = new Paint();

  paint.setAntiAlias(true);
  paint.setStyle(this.paintStyle);
  paint.setStrokeWidth(this.paintStrokeWidth);
  paint.setStrokeCap(this.lineCap);
  paint.setStrokeJoin(Paint.Join.MITER);  // fixed

  // for Text
  if (this.mode == Mode.TEXT) {
    paint.setTypeface(this.fontFamily);
    paint.setTextSize(this.fontSize);
    paint.setTextAlign(this.textAlign);
    paint.setStrokeWidth(0F);
  }

  if (this.mode == Mode.ERASER) {
    // Eraser
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
    paint.setARGB(0, 0, 0, 0);

    // paint.setColor(this.baseColor);
    // paint.setShadowLayer(this.blur, 0F, 0F, this.baseColor);
  } else {
    // Otherwise
    paint.setColor(this.paintStrokeColor);
    paint.setShadowLayer(this.blur, 0F, 0F, this.paintStrokeColor);
    paint.setAlpha(this.opacity);
  }

  return paint;
}