Android Open Source - Munin-for-Android Dynazoom Helper

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.chteuchteu.munin.hlpr;
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import android.content.Context;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ProgressBar;

import com.chteuchteu.munin.R;
import com.chteuchteu.munin.obj.MuninPlugin;
import com.chteuchteu.munin.obj.MuninServer;
import com.edmodo.rangebar.RangeBar;

public final class DynazoomHelper {
  private static int GRAPH_LEFT_MARGIN = 155;
  private static int GRAPH_RIGHT_MARGIN = 50;
  // Because of the bitmap shadow
  private static int GRAPH_TOP_MARGIN = 7;
  private static int GRAPH_BOTTOM_MARGIN = 13;

  public static int RANGEBAR_TICKS_COUNT = 30;

  public static void updateHighlightedArea(View highlightArea1, View highlightArea2, RangeBar rangeBar, ImageView imageView) {
    int[] steps = { rangeBar.getLeftIndex(),  rangeBar.getRightIndex() };
    int[] highlightedAreaX1 = getHighlightedAreaFromSteps(steps, RANGEBAR_TICKS_COUNT, imageView.getWidth(), 1);
    int[] highlightedAreaX2 = getHighlightedAreaFromSteps(steps, RANGEBAR_TICKS_COUNT, imageView.getWidth(), 2);

    // If we try to get the imageView position, we'll only get top=0, height=(full screen) since
    // the imageView layout_width && layout_height == MATCH_PARENT
    int[] bitmapPosition = Util.getBitmapPositionInsideImageView(imageView);

    int left, top, width, height;

    top = bitmapPosition[1] + GRAPH_TOP_MARGIN;
    height = bitmapPosition[3] - (GRAPH_TOP_MARGIN + GRAPH_BOTTOM_MARGIN);

    // Left mask
    left = highlightedAreaX1[0];
    width = highlightedAreaX1[1] - highlightedAreaX1[0];
    setLayoutParams(highlightArea1, width, height, left, top);

    // Right mask
    left = highlightedAreaX2[0];
    width = highlightedAreaX2[1] - highlightedAreaX2[0];
    setLayoutParams(highlightArea2, width, height, left, top);
  }

  private static void setLayoutParams(View view, int width, int height, int left, int top) {
    FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) view.getLayoutParams();
    layoutParams.width = width;
    layoutParams.height = height;
    layoutParams.leftMargin = left;
    layoutParams.topMargin = top;

    view.setLayoutParams(layoutParams);
    view.invalidate();
  }

  public static int[] getHighlightedAreaFromSteps(int[] steps, int nbSteps, int imageViewWidth, int highlightedAreaIndex) {
    int[] areaXDimens = new int[2];

    int imgX1 = DynazoomHelper.GRAPH_LEFT_MARGIN;
    int imgX2 = imageViewWidth - DynazoomHelper.GRAPH_RIGHT_MARGIN;
    int imgXDiff = imgX2 - imgX1;

    int hlAreaX1 = 0, hlAreaX2 = 0;

    if (highlightedAreaIndex == 1) {
      hlAreaX1 = 3;
      hlAreaX2 = steps[0] * imgXDiff / nbSteps + imgX1;
    } else if (highlightedAreaIndex == 2) {
      hlAreaX1 = steps[1] * imgXDiff / nbSteps + imgX1;
      hlAreaX2 = imageViewWidth - 13;
    }

    areaXDimens[0] = hlAreaX1;
    areaXDimens[1] = hlAreaX2;
    return areaXDimens;
  }

  public static class DynazoomFetcher extends AsyncTask<Void, Integer, Void> {
    private MuninServer server;
    private MuninPlugin plugin;
    private long pinPoint1;
    private long pinPoint2;

    private ImageView imageView;
    private ProgressBar progressBar;

    private Context context;
    private String userAgent;

    private Bitmap bitmap;

    public DynazoomFetcher (MuninPlugin plugin, ImageView iv, ProgressBar progressBar, Context context, String userAgent,
                            long pinPoint1, long pinPoint2) {
      super();
      this.server = plugin.getInstalledOn();
      this.plugin = plugin;
      this.pinPoint1 = pinPoint1;
      this.pinPoint2 = pinPoint2;

      this.imageView = iv;
      this.progressBar = progressBar;

      this.context = context;
      this.userAgent = userAgent;

      this.bitmap = null;
    }

    @Override
    protected void onPreExecute() {
      super.onPreExecute();
      imageView.setImageBitmap(null);
      progressBar.setVisibility(View.VISIBLE);
    }

    @Override
    protected Void doInBackground(Void... arg0) {
      int[] graphsDimensions = Util.HDGraphs.getBestImageDimensions(imageView, context);

      String imgUrl = plugin.getHDImgUrl(pinPoint1, pinPoint2, true, graphsDimensions[0], graphsDimensions[1]);

      bitmap = Util.removeBitmapBorder(server.getParent().grabBitmap(imgUrl, userAgent).getBitmap());
      bitmap = Util.dropShadow(bitmap);

      return null;
    }

    @Override
    protected void onPostExecute(Void result) {
      progressBar.setVisibility(View.GONE);

      if (bitmap != null)
        imageView.setImageBitmap(bitmap);
      else {
        // It seems that can actually fire OutOfMemoryError (BitmapFactory.nativeDecodeAsset)
        try {
          imageView.setImageResource(R.drawable.download_error);
        } catch (Exception e) { e.printStackTrace(); }
      }
    }
  }
}

Java Source Code List

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