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OpenGL vector map library written in Java - running on Android, iOS, Desktop and within the browser.
There is a newer version: 0.22.0
/*
 * Copyright 2012 Hannes Janetzek
 * Copyright 2016-2018 devemux86
 *
 * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see .
 */
package org.oscim.renderer;

import org.oscim.backend.CanvasAdapter;
import org.oscim.backend.canvas.Color;
import org.oscim.backend.canvas.Paint;
import org.oscim.backend.canvas.Paint.Cap;
import org.oscim.core.GeometryBuffer;
import org.oscim.core.Tile;
import org.oscim.renderer.bucket.LineBucket;
import org.oscim.renderer.bucket.TextBucket;
import org.oscim.renderer.bucket.TextItem;
import org.oscim.theme.styles.LineStyle;
import org.oscim.theme.styles.TextStyle;

public class GridRenderer extends BucketRenderer {

    private final TextBucket mTextBucket;
    private final TextStyle mText;
    private final LineBucket mLineBucket;
    private final GeometryBuffer mLines;
    private final StringBuilder mStringBuffer;

    private int mCurX, mCurY, mCurZ;

    public GridRenderer() {
        this(CanvasAdapter.getScale());
    }

    public GridRenderer(float scale) {
        this(1, new LineStyle(Color.GRAY, 1.2f * scale, Cap.BUTT),
                TextStyle.builder()
                        .fontSize(12 * scale)
                        .fontStyle(Paint.FontStyle.BOLD)
                        .color(Color.RED)
                        .build());
    }

    public GridRenderer(int numLines, LineStyle lineStyle, TextStyle textStyle) {
        int size = Tile.SIZE;

        /* not needed to set but we know: 16 lines 'a' two points */
        mLines = new GeometryBuffer(2 * 16, 16);

        float pos = -size * 4;

        /* 8 vertical lines */
        for (int i = 0; i < 8 * numLines; i++) {
            float x = pos + i * size / numLines;
            mLines.startLine();
            mLines.addPoint(x, pos);
            mLines.addPoint(x, pos + size * 8);
        }

        /* 8 horizontal lines */
        for (int j = 0; j < 8 * numLines; j++) {
            float y = pos + j * size / numLines;
            mLines.startLine();
            mLines.addPoint(pos, y);
            mLines.addPoint(pos + size * 8, y);
        }

        mText = textStyle;

        mLineBucket = new LineBucket(0);
        mLineBucket.line = lineStyle;

        if (mText != null) {
            mTextBucket = new TextBucket();
            mTextBucket.next = mLineBucket;
        } else {
            mTextBucket = null;
            mLineBucket.addLine(mLines);
            buckets.set(mLineBucket);
        }

        mStringBuffer = new StringBuilder(32);
    }

    private void addLabels(int x, int y, int z) {
        int s = Tile.SIZE;

        TextBucket tl = mTextBucket;
        tl.clear();

        StringBuilder sb = mStringBuffer;

        for (int yy = -2; yy < 2; yy++) {
            for (int xx = -2; xx < 2; xx++) {

                sb.setLength(0);
                sb.append(z)
                        .append(" / ")
                        .append(x + xx)
                        .append(" / ")
                        .append(y + yy);

                TextItem ti = TextItem.pool.get();
                ti.set(s * xx + s / 2, s * yy + s / 2, sb.toString(), mText);
                tl.addText(ti);
            }
        }
    }

    @Override
    public void update(GLViewport v) {
        /* scale coordinates relative to current 'zoom-level' to
         * get the position as the nearest tile coordinate */
        int z = 1 << v.pos.zoomLevel;
        int x = (int) (v.pos.x * z);
        int y = (int) (v.pos.y * z);

        /* update buckets when map moved by at least one tile */
        if (x == mCurX && y == mCurY && z == mCurZ)
            return;

        mCurX = x;
        mCurY = y;
        mCurZ = z;

        mMapPosition.copy(v.pos);
        mMapPosition.x = (double) x / z;
        mMapPosition.y = (double) y / z;
        mMapPosition.scale = z;

        if (mText != null) {
            buckets.set(mTextBucket);
            addLabels(x, y, v.pos.zoomLevel);
            mLineBucket.addLine(mLines);
            buckets.prepare();
            setReady(false);
        }

        if (!isReady())
            compile();
    }
}