Java GeoPolygon类代码示例

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
@Override
public void onDraw(GeoGeometry geoGeometry, GISDisplay display) {
    Float scaledTextSize = (null == mTextSize) ? null : (float) (mTextSize / display.getScale());
    GeoPoint center = geoGeometry.getEnvelope().getCenter();
    switch (geoGeometry.getType()) {
        case GTPolygon:
            drawPolygon((GeoPolygon) geoGeometry, display);
            drawText(scaledTextSize, center, display);
            break;
        case GTMultiPolygon:
            GeoMultiPolygon multiPolygon = (GeoMultiPolygon) geoGeometry;

            for (int i = 0; i < multiPolygon.size(); i++) {
                drawPolygon(multiPolygon.get(i), display);
                drawText(scaledTextSize, center, display);
            }
            break;

        //throw new IllegalArgumentException(
        //        "The input geometry type is not support by this style");
    }
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
public void drawPolygon(GeoPolygon polygon, GISDisplay display) {
    float scaledWidth = (float) (mWidth / display.getScale());

    Paint lnPaint = new Paint();
    lnPaint.setColor(mOutColor);
    lnPaint.setStrokeWidth(scaledWidth);
    lnPaint.setStrokeCap(Paint.Cap.ROUND);
    lnPaint.setAntiAlias(true);

    Path polygonPath = getPath(polygon);

    lnPaint.setStyle(Paint.Style.STROKE);
    lnPaint.setAlpha(mOuterAlpha);
    display.drawPath(polygonPath, lnPaint);

    if (mFill) {
        lnPaint.setStyle(Paint.Style.FILL);
        lnPaint.setColor(mColor);
        lnPaint.setAlpha(mInnerAlpha);
        display.drawPath(polygonPath, lnPaint);
    }
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
public void drawPolygon(GeoPolygon polygon, GISDisplay display) {
    Paint lnPaint = new Paint();
    lnPaint.setColor(mColor);
    lnPaint.setStrokeWidth((float) (mWidth / display.getScale()));
    lnPaint.setStrokeCap(Paint.Cap.ROUND);
    lnPaint.setAntiAlias(true);

    Path polygonPath = getPath(polygon);

    lnPaint.setStyle(Paint.Style.STROKE);
    lnPaint.setAlpha(mOuterAlpha);
    display.drawPath(polygonPath, lnPaint);

    if (mFill) {
        lnPaint.setStyle(Paint.Style.FILL);
        lnPaint.setAlpha(mInnerAlpha);
        lnPaint.setStrokeWidth(0);
        display.drawPath(polygonPath, lnPaint);
    }
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
protected void startGeometryByWalk() {
    // register broadcast events
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(WalkEditService.WALKEDIT_CHANGE);
    mReceiver = new WalkEditReceiver();
    mContext.registerReceiver(mReceiver, intentFilter);

    if (WalkEditService.isServiceRunning(mContext))
        return;

    // start service if not started yet
    GeoGeometry geometry = mFeature.getGeometry();
    int selectedRing = mSelectedItem.getSelectedRingId();
    int selectedGeometry = mDrawItems.indexOf(mSelectedItem);

    switch (mLayer.getGeometryType()) {
        case GeoConstants.GTLineString:
            break;
        case GeoConstants.GTPolygon:
            GeoPolygon polygon = ((GeoPolygon) geometry);
            geometry = selectedRing == 0 ? polygon.getOuterRing() : polygon.getInnerRing(selectedRing - 1);
            break;
        case GeoConstants.GTMultiLineString:
            geometry = ((GeoMultiLineString) geometry).get(selectedGeometry);
            break;
        case GeoConstants.GTMultiPolygon:
            GeoPolygon selectedPolygon = ((GeoMultiPolygon) geometry).get(selectedGeometry);
            geometry = selectedRing == 0 ? selectedPolygon.getOuterRing() : selectedPolygon.getInnerRing(selectedRing - 1);
            break;
        default:
            return;
    }

    Intent trackerService = new Intent(mContext, WalkEditService.class);
    trackerService.setAction(WalkEditService.ACTION_START);
    trackerService.putExtra(ConstantsUI.KEY_LAYER_ID, mLayer.getId());
    trackerService.putExtra(ConstantsUI.KEY_GEOMETRY, geometry);
    trackerService.putExtra(ConstantsUI.TARGET_CLASS, mContext.getClass().getName());
    mContext.startService(trackerService);
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
protected void fillDrawPolygon(GeoPolygon polygon) {
    mSelectedItem = new DrawItem();

    fillDrawRing(polygon.getOuterRing());
    for (int i = 0; i < polygon.getInnerRingCount(); i++)
        fillDrawRing(polygon.getInnerRing(i));

    mDrawItems.add(mSelectedItem);
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
public void setGeometryFromWalkEdit(GeoGeometry geometry) {
    int selectedGeometry = mDrawItems.indexOf(mSelectedItem);
    int selectedRing = mSelectedItem.getSelectedRingId();

    switch (mLayer.getGeometryType()) {
        case GeoConstants.GTLineString:
            mFeature.setGeometry(geometry);
            break;
        case GeoConstants.GTMultiLineString:
            GeoMultiLineString multiLine = (GeoMultiLineString) mFeature.getGeometry();
            multiLine.set(selectedGeometry, geometry);
            mFeature.setGeometry(multiLine);
            break;
        case GeoConstants.GTPolygon:
            GeoPolygon polygon = (GeoPolygon) mFeature.getGeometry();

            if (selectedRing == 0)
                polygon.setOuterRing((GeoLinearRing) geometry);
            else
                polygon.setInnerRing(selectedRing - 1, (GeoLinearRing) geometry);

            mFeature.setGeometry(polygon);
            break;
        case GeoConstants.GTMultiPolygon:
            GeoMultiPolygon multiPolygon = (GeoMultiPolygon) mFeature.getGeometry();
            GeoPolygon selectedPolygon = multiPolygon.get(selectedGeometry);
            selectedPolygon.setOuterRing((GeoLinearRing) geometry);

            if (selectedRing == 0)
                selectedPolygon.setOuterRing((GeoLinearRing) geometry);
            else
                selectedPolygon.setInnerRing(selectedRing - 1, (GeoLinearRing) geometry);

            multiPolygon.set(selectedGeometry, selectedPolygon);
            mFeature.setGeometry(multiPolygon);
            break;
    }
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
protected Path getPath(GeoPolygon polygon) {
    List<GeoPoint> points = polygon.getOuterRing().getPoints();
    Path polygonPath = new Path();
    appendPath(polygonPath, points);

    for (int i = 0; i < polygon.getInnerRingCount(); i++) {
        points = polygon.getInnerRing(i).getPoints();
        appendPath(polygonPath, points);
    }

    polygonPath.setFillType(Path.FillType.EVEN_ODD);

    return polygonPath;
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
@Override
public void onDraw(GeoGeometry geoGeometry, GISDisplay display) {
    switch (geoGeometry.getType()) {
        case GTPolygon:
            drawPolygon((GeoPolygon) geoGeometry, display);
            break;
        case GTMultiPolygon:
            GeoMultiPolygon multiPolygon = (GeoMultiPolygon) geoGeometry;

            for (int i = 0; i < multiPolygon.size(); i++) {
                drawPolygon(multiPolygon.get(i), display);
            }
            break;
        case GTPoint:
            drawPoint((GeoPoint) geoGeometry, display);
            break;
        case GTMultiPoint:
            GeoMultiPoint multiPoint = (GeoMultiPoint) geoGeometry;
            for (int i = 0; i < multiPoint.size(); i++) {
                drawPoint(multiPoint.get(i), display);
            }
            break;
        case GTLineString:
            drawLineString((GeoLineString) geoGeometry, display);
            break;
        case GTMultiLineString:
            GeoMultiLineString multiLineString = (GeoMultiLineString) geoGeometry;
            for (int i = 0; i < multiLineString.size(); i++) {
                drawLineString(multiLineString.get(i), display);
            }
            break;
    }
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
public static boolean isGeometryIntersects(Context context, GeoGeometry geometry) {
    if (geometry instanceof GeoPolygon) {
        if (((GeoPolygon) geometry).intersects()) {
            Toast.makeText(context, R.string.self_intersection, Toast.LENGTH_SHORT).show();
            return true;
        }

        if (!((GeoPolygon) geometry).isHolesInside()) {
            Toast.makeText(context, R.string.ring_outside, Toast.LENGTH_SHORT).show();
            return true;
        }

        if (((GeoPolygon) geometry).isHolesIntersect()) {
            Toast.makeText(context, R.string.rings_intersection, Toast.LENGTH_SHORT).show();
            return true;
        }
    }

    if (geometry instanceof GeoMultiPolygon) {
        if (((GeoMultiPolygon) geometry).isSelfIntersects()) {
            Toast.makeText(context, R.string.self_intersection, Toast.LENGTH_SHORT).show();
            return true;
        }

        if (!((GeoMultiPolygon) geometry).isHolesInside()) {
            Toast.makeText(context, R.string.ring_outside, Toast.LENGTH_SHORT).show();
            return true;
        }

        if (((GeoMultiPolygon) geometry).isHolesIntersect()) {
            Toast.makeText(context, R.string.rings_intersection, Toast.LENGTH_SHORT).show();
            return true;
        }
    }

    return false;
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
public void fillDrawItems(GeoGeometry geom) {
    int lastItemsCount = mDrawItems.size();
    int lastSelectedItemPosition = mDrawItems.indexOf(mSelectedItem);
    DrawItem lastSelectedItem = mSelectedItem;
    mDrawItems.clear();

    if (null == geom) {
        Log.w(Constants.TAG, "the geometry is null in fillDrawItems method");
        return;
    }

    GeoPoint[] geoPoints = new GeoPoint[1];
    switch (geom.getType()) {
        case GeoConstants.GTPoint:
            geoPoints[0] = (GeoPoint) geom;
            mSelectedItem = new DrawItem(DrawItem.TYPE_VERTEX, mapToScreen(geoPoints));
            mDrawItems.add(mSelectedItem);
            break;
        case GeoConstants.GTMultiPoint:
            GeoMultiPoint geoMultiPoint = (GeoMultiPoint) geom;
            for (int i = 0; i < geoMultiPoint.size(); i++) {
                geoPoints[0] = geoMultiPoint.get(i);
                mSelectedItem = new DrawItem(DrawItem.TYPE_VERTEX, mapToScreen(geoPoints));
                mDrawItems.add(mSelectedItem);
            }
            break;
        case GeoConstants.GTLineString:
            fillDrawLine((GeoLineString) geom);
            break;
        case GeoConstants.GTMultiLineString:
            GeoMultiLineString multiLineString = (GeoMultiLineString) geom;
            for (int i = 0; i < multiLineString.size(); i++)
                fillDrawLine(multiLineString.get(i));
            break;
        case GeoConstants.GTPolygon:
            fillDrawPolygon((GeoPolygon) geom);
            break;
        case GeoConstants.GTMultiPolygon:
            GeoMultiPolygon multiPolygon = (GeoMultiPolygon) geom;
            for (int i = 0; i < multiPolygon.size(); i++)
                fillDrawPolygon(multiPolygon.get(i));
            break;
        case GeoConstants.GTGeometryCollection:
            GeoGeometryCollection collection = (GeoGeometryCollection) geom;
            for (int i = 0; i < collection.size(); i++) {
                GeoGeometry geoGeometry = collection.get(i);
                fillDrawItems(geoGeometry);
            }
            break;
        default:
            break;
    }

    if (mDrawItems.size() == lastItemsCount && lastSelectedItem != null &&
            lastSelectedItemPosition != Constants.NOT_FOUND) {
        mSelectedItem = mDrawItems.get(lastSelectedItemPosition);
        mSelectedItem.setSelectedRing(lastSelectedItem.getSelectedRingId());
        mSelectedItem.setSelectedPoint(lastSelectedItem.getSelectedPointId());
    } else {
        mSelectedItem = mDrawItems.get(0);
    }
}
 

import com.nextgis.maplib.datasource.GeoPolygon; //导入依赖的package包/类
public static GeoPolygon convexHull(List<GeoPoint> points){
    List<GeoPoint> sortedPoints = new ArrayList<>(points);
    Collections.sort(sortedPoints, new GeoPointsCompare());

    int n = sortedPoints.size();

    GeoPoint[] lUpper = new GeoPoint[n];

    lUpper[0] = sortedPoints.get(0);
    lUpper[1] = sortedPoints.get(1);

    int lUpperSize = 2;

    for (int i = 2; i < n; i++)
    {
        lUpper[lUpperSize] = sortedPoints.get(i);
        lUpperSize++;

        while (lUpperSize > 2 && !rightTurn(lUpper[lUpperSize - 3], lUpper[lUpperSize - 2], lUpper[lUpperSize - 1]))
        {
            // Remove the middle point of the three last
            lUpper[lUpperSize - 2] = lUpper[lUpperSize - 1];
            lUpperSize--;
        }
    }

    GeoPoint[] lLower = new GeoPoint[n];

    lLower[0] = sortedPoints.get(n - 1);
    lLower[1] = sortedPoints.get(n - 2);

    int lLowerSize = 2;

    for (int i = n - 3; i >= 0; i--)
    {
        lLower[lLowerSize] = sortedPoints.get(i);
        lLowerSize++;

        while (lLowerSize > 2 && !rightTurn(lLower[lLowerSize - 3], lLower[lLowerSize - 2], lLower[lLowerSize - 1]))
        {
            // Remove the middle point of the three last
            lLower[lLowerSize - 2] = lLower[lLowerSize - 1];
            lLowerSize--;
        }
    }

    GeoPolygon polygon = new GeoPolygon();
    for (int i = 0; i < lUpperSize; i++)
    {
        polygon.add(lUpper[i]);
    }

    for (int i = 1; i < lLowerSize - 1; i++)
    {
        polygon.add(lLower[i]);
    }

    return polygon;

}