ThemeStylerActivity.java

package org.oscim.android.test;

import static org.oscim.utils.ColorUtil.modHsv;
import static org.oscim.utils.ColorUtil.shiftHue;

import org.oscim.layers.tile.buildings.BuildingLayer;
import org.oscim.layers.tile.vector.VectorTileLayer;
import org.oscim.layers.tile.vector.labeling.LabelLayer;
import org.oscim.map.Layers;
import org.oscim.renderer.MapRenderer;
import org.oscim.theme.RenderTheme;
import org.oscim.theme.VtmThemes;
import org.oscim.theme.rule.Rule;
import org.oscim.theme.rule.Rule.RuleVisitor;
import org.oscim.theme.styles.AreaStyle;
import org.oscim.theme.styles.AreaStyle.AreaBuilder;
import org.oscim.theme.styles.LineStyle;
import org.oscim.theme.styles.LineStyle.LineBuilder;
import org.oscim.theme.styles.RenderStyle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import android.os.Bundle;
import android.view.View;
import android.widget.RadioButton;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.ToggleButton;

public class ThemeStylerActivity extends BaseMapActivity implements OnSeekBarChangeListener {
	final Logger log = LoggerFactory.getLogger(ThemeStylerActivity.class);

	public ThemeStylerActivity() {
		super(R.layout.activity_map_styler);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		((SeekBar) findViewById(R.id.seekBarH)).setOnSeekBarChangeListener(this);
		((SeekBar) findViewById(R.id.seekBarS)).setOnSeekBarChangeListener(this);
		((SeekBar) findViewById(R.id.seekBarV)).setOnSeekBarChangeListener(this);

		Layers layers = mMap.layers();
		layers.add(new BuildingLayer(mMap, mBaseLayer));
		layers.add(new LabelLayer(mMap, mBaseLayer));

		mMap.setTheme(VtmThemes.DEFAULT);
	}

	class ModStyleVisitor extends RuleVisitor {
		private final LineBuilder<?> lineBuilder = LineStyle.builder();
		private final AreaBuilder<?> areaBuilder = AreaStyle.builder();

		@Override
		public void apply(Rule r) {
			for (RenderStyle style : r.styles) {

				if (style instanceof LineStyle) {
					LineStyle s = (LineStyle) style;
					HSV c = lineColor;
					if (lineColor.changed && s.outline)
						continue;

					if (outlineColor.changed) {
						if (!s.outline)
							continue;
						c = outlineColor;
					}

					s.set(lineBuilder.set(s)
					    .color(modColor(s.color, c))
					    .stippleColor(modColor(s.stippleColor, c))
					    .build());
					continue;
				}

				if (areaColor.changed && style instanceof AreaStyle) {
					AreaStyle s = (AreaStyle) style;

					s.set(areaBuilder.set(s)
					    .color(modColor(s.color, areaColor))
					    .blendColor(modColor(s.blendColor, areaColor))
					    .strokeColor(modColor(s.strokeColor, areaColor))
					    .build());
				}
			}
			super.apply(r);
		}
	}

	int modColor(int color, HSV hsv) {
		return modHsv(shiftHue(color, hsv.hue), 1, hsv.sat, hsv.val, true);
	}

	public static class HSV {
		public double hue = 0;
		public double sat = 1;
		public double val = 1;
		public boolean changed;
	}

	HSV lineColor = new HSV();
	HSV outlineColor = new HSV();
	HSV areaColor = new HSV();

	ModStyleVisitor mStyleVisitor = new ModStyleVisitor();

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
		if (!fromUser)
			return;
		int id = seekBar.getId();

		boolean modLine = ((RadioButton) findViewById(R.id.checkBoxLine)).isChecked();
		boolean modArea = ((RadioButton) findViewById(R.id.checkBoxArea)).isChecked();

		HSV c;
		if (modArea)
			c = areaColor;
		else if (modLine)
			c = lineColor;
		else
			c = outlineColor;

		if (id == R.id.seekBarS)
			c.sat = progress / 50f;
		else if (id == R.id.seekBarV)
			c.val = progress / 50f;
		else if (id == R.id.seekBarH)
			c.hue = progress / 100f;

		log.debug((modArea ? "area" : "line")
		        + " h:" + c.hue
		        + " s:" + c.sat
		        + " v:" + c.val);

		VectorTileLayer l = (VectorTileLayer) mMap.layers().get(1);
		RenderTheme t = (RenderTheme) l.getTheme();

		c.changed = true;
		t.traverseRules(mStyleVisitor);
		t.updateStyles();
		c.changed = false;

		if (modArea)
			MapRenderer.setBackgroundColor(modColor(t.getMapBackground(), c));

		mMap.render();
	}

	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
	}

	public void onToggleControls(View view) {
		findViewById(R.id.controls).setVisibility(((ToggleButton) view).isChecked() ?
		        View.VISIBLE : View.GONE);
	}

	public void onRadioButtonClicked(View view) {
		boolean checked = ((RadioButton) view).isChecked();
		if (!checked)
			return;

		HSV c = null;
		switch (view.getId()) {
			case R.id.checkBoxArea:
				c = areaColor;
				break;
			case R.id.checkBoxLine:
				c = lineColor;
				break;
			case R.id.checkBoxOutline:
				c = outlineColor;
				break;
		}
		if (c == null)
			return;
		((SeekBar) findViewById(R.id.seekBarS)).setProgress((int) (c.sat * 50));
		((SeekBar) findViewById(R.id.seekBarV)).setProgress((int) (c.val * 50));
		((SeekBar) findViewById(R.id.seekBarH)).setProgress((int) (c.hue * 100));
	}
}