Example #1
0
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    // Draw the shadow
    canvas.drawOval(mShadowBounds, mShadowPaint);

    // TODO 0 Slices
    String label = "";
    //        if(mData.size() > 0)
    label = mData.get(mCurrentItem).mLabel;
    //        else
    //        	label = NO_DATA_SLICE;

    // Draw the label text
    if (getShowText()) {
      canvas.drawText(label, mTextX, mTextY, mTextPaint);
    }

    // If the API level is less than 11, we can't rely on the view animation system to
    // do the scrolling animation. Need to tick it here and call postInvalidate() until the
    // scrolling is done.
    if (Build.VERSION.SDK_INT < 11) {
      tickScrollAnimation();
      if (!mScroller.isFinished()) {
        postInvalidate();
      }
    }
  }
  @Override
  protected void onDraw(Canvas canvas) {
    float ringWidth = textHeight + 4;
    int height = getMeasuredHeight();
    int width = getMeasuredWidth();

    int px = width / 2;
    int py = height / 2;
    Point center = new Point(px, py);

    int radius = Math.min(px, py) - 2;

    RectF boundingBox =
        new RectF(center.x - radius, center.y - radius, center.x + radius, center.y + radius);

    RectF innerBoundingBox =
        new RectF(
            center.x - radius + ringWidth,
            center.y - radius + ringWidth,
            center.x + radius - ringWidth,
            center.y + radius - ringWidth);

    float innerRadius = innerBoundingBox.height() / 2;
    RadialGradient borderGradient =
        new RadialGradient(
            px, py, radius, borderGradientColors, borderGradientPositions, TileMode.CLAMP);

    Paint pgb = new Paint();
    pgb.setShader(borderGradient);

    Path outerRingPath = new Path();
    outerRingPath.addOval(boundingBox, Direction.CW);

    canvas.drawPath(outerRingPath, pgb);
    LinearGradient skyShader =
        new LinearGradient(
            center.x,
            innerBoundingBox.top,
            center.x,
            innerBoundingBox.bottom,
            skyHorizonColorFrom,
            skyHorizonColorTo,
            TileMode.CLAMP);

    Paint skyPaint = new Paint();
    skyPaint.setShader(skyShader);

    LinearGradient groundShader =
        new LinearGradient(
            center.x,
            innerBoundingBox.top,
            center.x,
            innerBoundingBox.bottom,
            groundHorizonColorFrom,
            groundHorizonColorTo,
            TileMode.CLAMP);

    Paint groundPaint = new Paint();
    groundPaint.setShader(groundShader);
    float tiltDegree = pitch;
    while (tiltDegree > 90 || tiltDegree < -90) {
      if (tiltDegree > 90) tiltDegree = -90 + (tiltDegree - 90);
      if (tiltDegree < -90) tiltDegree = 90 - (tiltDegree + 90);
    }

    float rollDegree = roll;
    while (rollDegree > 180 || rollDegree < -180) {
      if (rollDegree > 180) rollDegree = -180 + (rollDegree - 180);
      if (rollDegree < -180) rollDegree = 180 - (rollDegree + 180);
    }
    Path skyPath = new Path();
    skyPath.addArc(innerBoundingBox, -rollDegree, (180 + (2 * rollDegree)));
    canvas.rotate(-tiltDegree, px, py);
    canvas.drawOval(innerBoundingBox, groundPaint);
    canvas.drawPath(skyPath, skyPaint);
    canvas.drawPath(skyPath, markerPaint);
    int markWidth = radius / 3;
    int startX = center.x - markWidth;
    int endX = center.x + markWidth;

    Log.d("PAARV ", "Roll " + String.valueOf(rollDegree));
    Log.d("PAARV ", "Pitch " + String.valueOf(tiltDegree));

    double h = innerRadius * Math.cos(Math.toRadians(90 - tiltDegree));
    double justTiltX = center.x - h;

    float pxPerDegree = (innerBoundingBox.height() / 2) / 45f;
    for (int i = 90; i >= -90; i -= 10) {
      double ypos = justTiltX + i * pxPerDegree;

      if ((ypos < (innerBoundingBox.top + textHeight))
          || (ypos > innerBoundingBox.bottom - textHeight)) continue;

      canvas.drawLine(startX, (float) ypos, endX, (float) ypos, markerPaint);
      int displayPos = (int) (tiltDegree - i);
      String displayString = String.valueOf(displayPos);
      float stringSizeWidth = textPaint.measureText(displayString);
      canvas.drawText(
          displayString, (int) (center.x - stringSizeWidth / 2), (int) (ypos) + 1, textPaint);
    }
    markerPaint.setStrokeWidth(2);
    canvas.drawLine(
        center.x - radius / 2,
        (float) justTiltX,
        center.x + radius / 2,
        (float) justTiltX,
        markerPaint);
    markerPaint.setStrokeWidth(1);

    Path rollArrow = new Path();
    rollArrow.moveTo(center.x - 3, (int) innerBoundingBox.top + 14);
    rollArrow.lineTo(center.x, (int) innerBoundingBox.top + 10);
    rollArrow.moveTo(center.x + 3, innerBoundingBox.top + 14);
    rollArrow.lineTo(center.x, innerBoundingBox.top + 10);
    canvas.drawPath(rollArrow, markerPaint);
    String rollText = String.valueOf(rollDegree);
    double rollTextWidth = textPaint.measureText(rollText);
    canvas.drawText(
        rollText,
        (float) (center.x - rollTextWidth / 2),
        innerBoundingBox.top + textHeight + 2,
        textPaint);
    canvas.restore();

    canvas.save();
    canvas.rotate(180, center.x, center.y);
    for (int i = -180; i < 180; i += 10) {
      if (i % 30 == 0) {
        String rollString = String.valueOf(i * -1);
        float rollStringWidth = textPaint.measureText(rollString);
        PointF rollStringCenter =
            new PointF(center.x - rollStringWidth / 2, innerBoundingBox.top + 1 + textHeight);
        canvas.drawText(rollString, rollStringCenter.x, rollStringCenter.y, textPaint);
      } else {
        canvas.drawLine(
            center.x,
            (int) innerBoundingBox.top,
            center.x,
            (int) innerBoundingBox.top + 5,
            markerPaint);
      }

      canvas.rotate(10, center.x, center.y);
    }
    canvas.restore();
    canvas.save();
    canvas.rotate(-1 * (bearing), px, py);

    double increment = 22.5;

    for (double i = 0; i < 360; i += increment) {
      CompassDirection cd = CompassDirection.values()[(int) (i / 22.5)];
      String headString = cd.toString();

      float headStringWidth = textPaint.measureText(headString);
      PointF headStringCenter =
          new PointF(center.x - headStringWidth / 2, boundingBox.top + 1 + textHeight);

      if (i % increment == 0)
        canvas.drawText(headString, headStringCenter.x, headStringCenter.y, textPaint);
      else
        canvas.drawLine(
            center.x, (int) boundingBox.top, center.x, (int) boundingBox.top + 3, markerPaint);

      canvas.rotate((int) increment, center.x, center.y);
    }
    canvas.restore();
    RadialGradient glassShader =
        new RadialGradient(
            px, py, (int) innerRadius, glassGradientColors, glassGradientPositions, TileMode.CLAMP);
    Paint glassPaint = new Paint();
    glassPaint.setShader(glassShader);

    canvas.drawOval(innerBoundingBox, glassPaint);
    canvas.drawOval(boundingBox, circlePaint);

    circlePaint.setStrokeWidth(2);
    canvas.drawOval(innerBoundingBox, circlePaint);

    canvas.restore();
  }
Example #3
0
  /**
   * 自定义的方法,简单绘制一些基本图形
   *
   * @param mCanvas 把图形画在mCanvas上
   */
  public void canvasMethod(Canvas mCanvas) {

    // 创建对应坐标的矩形区域
    RectF mArc = new RectF(mX, mY - 70, mX + 50, mY - 20);
    // 画填充弧,在矩形区域内,从弧的最右边开始,画270度,然后再通过连接圆心来填充
    mCanvas.drawArc(mArc, 0, 270, true, mPaint);

    // 获得icon的Bitmap对象
    Bitmap mBitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
    // 画图片
    mCanvas.drawBitmap(mBitmap, mX, mY, mPaint);

    // 画圆,(x轴,y轴,半径,画笔)
    mCanvas.drawCircle(mX + 10, mY + 60, 10, mPaint);

    // 画一条线,(起点横坐标,起点纵坐标,终点横坐标,终点纵坐标,画笔)
    mCanvas.drawLine(mX, mY + 75, mX + 20, mY + 75, mPaint);
    // 画多条线,(坐标数组,画笔)坐标数组里每四个值构成一条线
    mCanvas.drawLines(
        new float[] {mX + 50, mY + 45, mX + 50, mY + 75, mX + 60, mY + 45, mX + 60, mY + 75},
        mPaint);

    // 创建对应矩形区域
    RectF mOval = new RectF(mX, mY + 80, mX + 60, mY + 110);
    // 画椭圆
    mCanvas.drawOval(mOval, mPaint);

    /*
     * Paint qPaint = new Paint(); qPaint.setColor(Color.RED);
     * mCanvas.drawPaint(qPaint);
     */

    // 重置Path里的所有路径
    mPath.reset();
    // 设置Path的起点
    mPath.moveTo(mX, mY + 120);
    // 第二个点
    mPath.lineTo(screenW - 10, mY + 120);
    // 第三个点
    mPath.lineTo(screenW - 10, mY + 150);
    // 画出路径,这里画的是三角形
    mCanvas.drawPath(mPath, mPaint);

    // 重置Path里的所有路径
    qPath.reset();
    // 设置Path的起点
    qPath.moveTo(qStartX, qStartY);
    // 设置贝塞尔曲线的控制点坐标和终点坐标
    qPath.quadTo(qControlX, qCOntrolY, qEndX, qEndY);
    // 画出贝塞尔曲线
    mCanvas.drawPath(qPath, qPaint);

    // 画点
    mCanvas.drawPoint(mX, mY + 155, qPaint);
    // 画多个点,坐标数组每两个值代表一个点的坐标
    mCanvas.drawPoints(new float[] {mX, mY + 160, mX + 5, mY + 160, mX + 5, mY + 160}, qPaint);

    // 画矩形
    mCanvas.drawRect(mX, mY + 170, mX + 100, mY + 220, mPaint);

    // 设置矩形区域
    RectF mRect = new RectF(mX, mY + 230, mX + 100, mY + 260);
    // 画圆角矩形,这个方法的第二第三个参数在后面有图讲解
    mCanvas.drawRoundRect(mRect, 10, 10, mPaint);

    // 画文本
    mCanvas.drawText("drawText", mX, mY + 290, mPaint);
    // 画文本,数组里每两个值代表文本的一个字符的坐标,数组的坐标可以比字符串里的字符多,但不可以少
    mCanvas.drawPosText(
        "哈哈你好",
        new float[] {mX, mY + 310, mX + 20, mY + 310, mX + 40, mY + 310, mX + 60, mY + 310},
        mPaint);

    // 重置Path
    tPath.reset();
    // 添加一个圆形路径,坐标,半径,方向(顺时针还是逆时针)
    tPath.addCircle(mX + 10, mY + 340, 10, Path.Direction.CW);
    // 画出路径
    mCanvas.drawPath(tPath, qPaint);
    // 把文本画在路径上,但不会画出路径
    mCanvas.drawTextOnPath("draw", tPath, 30, 0, mPaint);
  }