// Copyright by Barry G. Becker, 2012. Licensed under MIT License: http://www.opensource.org/licenses/MIT
package com.barrybecker4.ui.legend;
import com.barrybecker4.ui.util.ColorMap;
import com.barrybecker4.common.format.FormatUtil;
import com.barrybecker4.common.math.cutpoints.CutPointGenerator;
import com.barrybecker4.common.math.Range;
import javax.swing.*;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
/**
* Draw labels underneath the legend line.
*
* @author Barry Becker
*/
class LegendLabelsPanel extends JPanel {
private static final Font LABEL_FONT = new Font("Sanserif", Font.PLAIN, 10); //NON-NLS
private static final int LABEL_SPACING = 110;
/**
* By default the min and max come from the colormap min and max
* in some cases, such as synchronizing with another map, you may want to adjust them.
*/
private Range range_;
private CutPointGenerator cutPointGenerator;
LegendLabelsPanel(ColorMap colormap) {
range_ = new Range(colormap.getMinValue(), colormap.getMaxValue());
cutPointGenerator = new CutPointGenerator();
}
public double getMin() {
return range_.getMin();
}
public void setMin(double min) {
assert(min < range_.getMax()) : "Min=" + min + " cannot be greater than the max=" + range_.getMax();
range_ = new Range(min, range_.getMax());
}
public double getMax() {
return range_.getMax();
}
public void setMax(double max) {
assert(max > range_.getMin()) :"Max=" + max + " cannot be less than the min=" + range_.getMin();
range_ = new Range(range_.getMin(), max);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponents(g);
Graphics2D g2 = (Graphics2D) g;
FontRenderContext frc = g2.getFontRenderContext();
int desiredTicks = this.getWidth() / LABEL_SPACING;
double[] values = cutPointGenerator.getCutPoints(range_, 2 + desiredTicks);
g2.setColor(this.getBackground()); // was white
int width = this.getWidth();
g2.fillRect(0, 0, width, 25);
int numVals = values.length;
double rat = (double) (width - 20) / range_.getExtent();
g2.setColor(Color.black);
g2.setFont(LABEL_FONT);
g2.drawString(FormatUtil.formatNumber(range_.getMin()), 2, 10);
for (int i = 1; i < numVals - 2; i++) {
double xpos = rat * (values[i] - range_.getMin());
String label = FormatUtil.formatNumber(values[i]);
g2.drawString(label, (int) xpos, 10);
}
String maxLabel = FormatUtil.formatNumber(range_.getMax());
Rectangle2D bounds = g2.getFont().getStringBounds(maxLabel, frc);
double maxLabelWidth = bounds.getWidth();
if (values.length > 2) {
double xpos = rat * (values[numVals - 2] - range_.getMin());
String label = FormatUtil.formatNumber(values[numVals - 2]);
if ((width - xpos) > (maxLabelWidth + (LABEL_SPACING >> 1))) {
g2.drawString(label, (int) xpos, 10);
}
}
g2.drawString(maxLabel, (int) (width - bounds.getWidth() - 5), 10);
}
}