source: other-projects/tipple-android/tipple-ar/tipple-standalone-hpg/src/org/greenstone/android/tipple/base/AROverlay.java@ 26528

package org.greenstone.android.tipple.base;

import java.text.DecimalFormat;
import java.util.Collections;
import java.util.Comparator;

import org.mapsforge.core.GeoPoint;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.location.Location;
import android.speech.tts.TextToSpeech;
import android.view.MotionEvent;
import android.view.View;

public class AROverlay extends View {
    ARActivity activity;
    Paint paintFill;
    Paint paintOutline;
    Paint paintText;
    Paint borderText;
    
    DecimalFormat df;

    boolean isDialogBoxShowing = false;

    public AROverlay(ARActivity context) {
        super(context);
        
        df = new DecimalFormat("#.#");

        activity = context;
        paintFill = new Paint();
        paintFill.setStyle(Paint.Style.FILL);
        paintFill.setAntiAlias(true);
        paintOutline = new Paint();
        paintOutline.setStyle(Paint.Style.STROKE);
        paintOutline.setStrokeWidth(5);
        paintOutline.setAntiAlias(true);
        paintText = new Paint();
        paintText.setTextAlign(Paint.Align.CENTER);
        paintText.setTextSize(35);
        paintText.setColor(Color.BLACK);
        paintText.setAntiAlias(true);
        paintText.setShadowLayer(3, 1, 1, Color.WHITE);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        
        if (isDialogBoxShowing) return false;
        
        float x_finger = event.getX();
        float y_finger = event.getY();

        for (int i = Global.locations.size() - 1; i >= 0; i--)
        {
            TipLocation loc = Global.locations.get(i);
            
            if (loc.hits(x_finger, y_finger))
            {
                isDialogBoxShowing = true;
                
                AlertDialog.Builder dialog = new AlertDialog.Builder(activity);
                dialog.setTitle(loc.getTitle());
                dialog.setMessage(loc.getText());
                
                dialog.setOnCancelListener(new OnCancelListener() {
                    @Override
                    public void onCancel(DialogInterface dialog) {
                        Global.tts.stop();
                        isDialogBoxShowing = false;
                    }
                });
                
                dialog.show();
                
                Global.tts.speak(loc.getTitleTTS(), TextToSpeech.QUEUE_FLUSH, null);
                Global.tts.speak(loc.getTTSText(), TextToSpeech.QUEUE_ADD, null);
                
                ArDirection.setGPSpidouble(new GeoPoint(loc.getLatitude(), loc.getLongitude()));
                return true;
            }
        }
        
        return false;
    }

    @Override
    protected void onDraw(Canvas canvas) {

        // recalculate the screen locations
        for (int i = 0; i < Global.locations.size(); i++) {
            Global.locations.get(i).projectToScreen(LocationFusion.getInstance().lastKnownLocation,
                    SensorFusion.getInstance().getRotationMatrix());
        }

        // sort the points, closest first
        Collections.sort(Global.locations, new Comparator<TipLocation>() {
            public int compare(TipLocation left, TipLocation right) {
                return Float.compare(left.getDistance(), right.getDistance());
            }
        });

        float screenAngle = SensorFusion.getInstance().getScreenAngleDegrees();
        float[] markerHitCircle = new float[3];

        // draw the locations (closest last)
        for (int i = Global.locations.size() - 1; i >= 0; i--) {

            TipLocation loc = Global.locations.get(i);

            if (loc.isVisible()) {

                canvas.save(); // save the default canvas matrix

                // shift the canvas so that the location can be drawn at (0, 0)
                canvas.translate(loc.getScreenX(), loc.getScreenY());
                // rotate the canvas
                canvas.rotate(screenAngle);
                
                canvas.save(); // save the rotated & translated canvas

                // scale the canvas for the text
                float textScale = Math.min(200 * loc.getScreenScale(), 1);
                canvas.scale(textScale, textScale);
                
                // draw the text
                //String text = String.format("%s (%1.1fm)", loc.getTitle(), loc.getDistance());
                canvas.drawText(loc.getTitle() + " (" + df.format(loc.getDistance()) + "m)", 0, paintText.getTextSize(), paintText);
                
                canvas.restore(); // undo the scaling (go back to the rotated & scaled version)

                // scale the canvas for the bitmap
                float markerScale = Math.min(500 * loc.getScreenScale(), 4);
                canvas.scale(markerScale, markerScale);

                // now draw the bitmap onto the centre of the canvas and let the canvas' matrix
                // transform that to the right location, rotation and size
                float x = -loc.getMarkerBitmap().getWidth() / 2;
                float y = -loc.getMarkerBitmap().getHeight();
                canvas.drawBitmap(loc.getMarkerBitmap(), x, y, paintFill);
                
                // save the marker hit circle
                markerHitCircle[0] = 0;
                markerHitCircle[1] = -loc.getMarkerBitmap().getHeight() / 2;
                canvas.getMatrix().mapPoints(markerHitCircle);
                loc.setHitCircle(markerHitCircle[0], markerHitCircle[1], markerScale * 12 + 5);

                canvas.restore(); // undo the rotation & translation
            }
        }
        //drawInfo(canvas);

        super.onDraw(canvas);
    }

    private void drawInfo(Canvas canvas) {
        Paint back = new Paint();
        back.setColor(Color.WHITE);
        back.setAlpha(150);
        Paint fore = new Paint();
        fore.setColor(Color.BLACK);
        fore.setTextSize(25);
        fore.setAntiAlias(true);

        Location loc = LocationFusion.getInstance().lastKnownLocation;
        String[] text = new String[] {
                String.format("GPS: lat=%.1f, lon=%.1f, alt=%.1f, accuracy=%.2f",
                        loc.getLatitude(), loc.getLongitude(), loc.getAltitude(), loc.getAccuracy()),
                String.format("Number of points: %d", Global.locations.size()) };

        canvas.drawRect(0, 0, 800, 100, back);

        for (int row = 0; row < text.length; row++) {
            canvas.drawText(text[row], 10, 30 + 30 * row, fore);
        }
    }
}