使用 IndoorAtlas 显示楼层平面图并获取位置

问题描述

是否有关于如何使用 IndoorAtlas SDK 的资源?

Is there any resource on how to use the IndoorAtlas SDK?

我对如何显示楼层平面图和获取当前位置感到困惑.

I'm getting confused about how to show the floorPlan and getting current location.

请帮助我.

推荐答案

大致的方法如下:

1) 初始化 IndoorAtlas 实例:

1) Initialize IndoorAtlas instance:

IndoorAtlas ia = IndoorAtlasFactory.createIndoorAtlas(context, listener, apiKey, apiSecret);

2) 获取 FloorPlan 的实例:

2) Obtain instance of FloorPlan:

FutureResult<FloorPlan> result = ia.fetchFloorPlan(floorPlanId);
result.setCallback(new ResultCallback<FloorPlan>() {
            @Override
            public void onResult(final FloorPlan result) {
                mFloorPlan = result;
                loadFloorPlanImage(result);
            }
            // handle error conditions too
}

3) 获取实际图像:

void loadFloorPlanImage(FloorPlan floorPlan) {
  BitmapFactory.Options options = createBitmapOptions(floorPlan);
  FutureResult<Bitmap> result = ia.fetchFloorPlanImage(floorPlan, options);
  result.setCallback(new ResultCallback<Bitmap>() {
            @Override
            public void onResult(final Bitmap result) {
               // now you have floor plan bitmap, do something with it
               updateImageViewInUiThread(result);
            }
            // handle error conditions too
  }
}

4) 开始定位:

ia.startPositioning(venueId, floorId, floorPlanId);

5) 在平面图上显示位置:

5) Show positions on floor plan:

public void onServiceUpdate(ServiceState state) {

   // get position on original floor plan image
   int i = state.getImagePoint().getI();
   int j = state.getImagePoint().getJ();

   // take into account how your floor plan image has been scaled
   // and draw position
   PointF scaledPoint = new PointF();
   Util.calculateScaledPoint((int) floorPlan.dimensions[0], (int) floorPlan.dimensions[1], i, j, mImageView, scaledPoint);

   drawNewPositionInUiThread(scaledPoint.x, scaledPoint.y);

}

当然可以先定位再获取图像.您也可以在本地缓存图像，但如上所述，大致就是这样.

Of course you can start positioning first and then obtain image. You could also cache image locally but like said, this was roughly how.

Util.java:

public class Utils {


    /**
     * Calculates scaling factor for an image with original dimensions of
     * {@code originalWidth x originalHeight} being displayed with {@code imageView}.
     *
     * The assumption with this example code is that a) layout has been already performed for
     * {@code imageView} and that {@link android.widget.ImageView.ScaleType#CENTER_INSIDE} is used.
     *
     * @param originalWidth  height of the original bitmap to be displayed using {@code imageView}
     * @param originalHeight width of the original bitmap to be displayed using {@code imageView}
     */
    public static float calculateScaleFactor(int originalWidth, int originalHeight,
                                             ImageView imageView) {

        if (imageView.getScaleType() != ImageView.ScaleType.CENTER_INSIDE) {
            throw new IllegalArgumentException("only scale type of CENTER_INSIDE supported, was: "
                    + imageView.getScaleType());
        }

        final int availableX = imageView.getWidth()
                - (imageView.getPaddingLeft() + imageView.getPaddingRight());
        final int availableY = imageView.getHeight()
                - (imageView.getPaddingTop() + imageView.getPaddingBottom());

        if (originalWidth > availableX || originalHeight > availableY) {
            // original image would not fit without scaling
            return originalWidth > availableX
                    ? availableX / (float) originalWidth
                    : availableY / (float) originalHeight;
        } else {
            return 1f; // no scaling required
        }

    }


    /**
     * Calculates point where to draw coordinates {@code x} and {@code y} in a bitmap that's
     * original dimensions were {@code originalWidth x originalHeight} and may now be scaled down
     * as it's been displayed with {@code imageView}.
     *
     * @param originalWidth  width of the original bitmap before any scaling
     * @param originalHeight height of the original bitmap before any scaling
     * @param x              x-coordinate on original bitmap
     * @param y              y-coordinate on original bitmap
     * @param imageView      view that will be used to display bitmap
     * @param point          point where result value is to be stored
     * @see #calculateScaleFactor(int, int, ImageView)
     */
    public static void calculateScaledPoint(int originalWidth, int originalHeight,
                                            int x, int y,
                                            ImageView imageView,
                                            PointF point) {


        final float scale = calculateScaleFactor(originalWidth, originalHeight, imageView);
        final float scaledWidth = originalWidth * scale;
        final float scaledHeight = originalHeight * scale;

        // when image inside view is smaller than the view itself and image is centered (assumption)
        // there will be some empty space around the image (here offset)
        final float offsetX = Math.max(0, (imageView.getWidth() - scaledWidth) / 2);
        final float offsetY = Math.max(0, (imageView.getHeight() - scaledHeight) / 2);

        point.x = offsetX + (x * scale);
        point.y = offsetY + (y * scale);


    }


}

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