绘制圆角边缘弧机器人与浮雕效果 [英] draw rounded edge arc in android with embossed effect

问题描述

我试图建立一个自定义组件，即弧形滑盖，我做的弧线和拇指，但无法弄清楚我怎么能画出圆角边缘弧线，并在它的浮雕效果。此刻的滑块看起来像这样

I am trying to develop a custom component i.e. arc slider, I am done with the arc and the thumb but not able to figure out how can I draw the rounded edge arc and also the embossed effect in it. at the moment the slider looks something like this

在code绘制弧

private void drawSlider(Canvas canvas) {
    float sweepDegrees = (value * arcWidthInAngle)
            / (maximumValue - minimumValue);

    // the grey empty part of the circle
    drawArc(canvas, startAngle, arcWidthInAngle, mTrackColor);
    // the colored "filled" part of the circle
    drawArc(canvas, startAngle, sweepDegrees, mFillColor);

    // the thumb to drag.       
    int radius = ((diameter/2) - (mArcThickness/2));
    Point thumbPoint = calculatePointOnArc(centerX, centerY, radius, startAngle + sweepDegrees);

    thumbPoint.x = thumbPoint.x - (mThumbDiameter/2);
    thumbPoint.y = thumbPoint.y - (mThumbDiameter/2);

    Bitmap thumbBitmap = BitmapFactory.decodeResource(
            mContext.getResources(), R.drawable.circle25);

    thumbBitmap = getResizedBitmap(thumbBitmap, mThumbDiameter, mThumbDiameter);
    canvas.drawBitmap(thumbBitmap, thumbPoint.x, thumbPoint.y,
            null);  

}

private void drawArc(Canvas canvas, float startAngle, float sweepDegrees,
        Paint paint) {
    if (sweepDegrees <= 0 || sweepDegrees > arcWidthInAngle) {
        return;
    }
    path.reset();
    path.arcTo(outerCircle, startAngle, sweepDegrees);
    path.arcTo(innerCircle, startAngle + sweepDegrees, -sweepDegrees);
    // innerCircle.
    path.close();
    canvas.drawPath(path, paint);
}

我的目标为圆弧像这样

I am aiming for the arc something like this

推荐答案

我设法建立电弧一些什么样的下方

I managed to build the arc some what like below

我所做的是我计算的弧线起止点，有我画的圆圈直径等于圆弧的厚度。

What I did is I calculated the arc starting and ending point and there I draw the circle with diameter equal to arc thickness.

在code因为这是

private void drawSlider(Canvas canvas) {
    float sweepDegrees = (value * arcWidthInAngle)
            / (maximumValue - minimumValue);

    // the grey empty part of the arc       
    drawArc(canvas, startAngle, arcWidthInAngle, mTrackColor);

    // the colored "filled" part of the arc
    drawArc(canvas, startAngle, sweepDegrees, mFillColor);

    // the thumb to drag.       
    int radius = ((diameter/2) - (mArcThickness/2));
    Point thumbPoint = calculatePointOnArc(centerX, centerY, radius, startAngle + sweepDegrees);

    thumbPoint.x = thumbPoint.x - (mThumbDiameter/2);
    thumbPoint.y = thumbPoint.y - (mThumbDiameter/2);

    Bitmap thumbBitmap = BitmapFactory.decodeResource(
            mContext.getResources(), R.drawable.circle25);

    thumbBitmap = getResizedBitmap(thumbBitmap, mThumbDiameter, mThumbDiameter);
    canvas.drawBitmap(thumbBitmap, thumbPoint.x, thumbPoint.y,
            null);

    //drawArc(canvas, startAngle, startAngle + sweepDegrees, white);
}
private void drawArc(Canvas canvas, float startAngle, float sweepDegrees,
        Paint paint) {
    if (sweepDegrees <= 0 || sweepDegrees > arcWidthInAngle) {
        return;
    }
    path.reset();


    int radius = ((diameter/2) - (mArcThickness/2));
    Point startPoint = calculatePointOnArc(centerX, centerY, radius, startAngle);
    Point endPoint = calculatePointOnArc(centerX, centerY, radius, startAngle + sweepDegrees);


    path.arcTo(outerCircle, startAngle, sweepDegrees);
    path.arcTo(innerCircle, startAngle + sweepDegrees, -sweepDegrees);
    // drawing the circle at both the end point of the arc to git it rounded look.
    path.addCircle(startPoint.x, startPoint.y, mArcThickness/2, Path.Direction.CW);
    path.addCircle(endPoint.x, endPoint.y, mArcThickness/2, Path.Direction.CW);

    path.close();            

    canvas.drawPath(path, paint);
}
    // this is to calculate the end points of the arc
private Point calculatePointOnArc(int circleCeX, int circleCeY, int circleRadius, float endAngle) 
    {
    Point point = new Point();
    double endAngleRadian = endAngle * (Math.PI / 180);

    int pointX = (int) Math.round((circleCeX + circleRadius * Math.cos(endAngleRadian)));
    int pointY = (int) Math.round((circleCeY + circleRadius * Math.sin(endAngleRadian)));

    point.x = pointX;
    point.y = pointY;

    return point;
}
// for the emboss effect set maskfilter of the paint to EmbossMaskFilter 
    private Paint mTrackColor = new Paint();
    MaskFilter  mEmboss = new EmbossMaskFilter(new float[] { 0.0f, -1.0f, 0.5f},
            0.8f, 15, 1.0f);
    mTrackColor.setMaskFilter(mEmboss);

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