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Classa para gerar gráficos de barras em html.

/*--------------------------------------------------------
 * AmauriceBot - RuneScape Wikia update task robot
 * Copyright (c) 2009-2012  Maurice Abraham.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Contributors:
 *   None
 *------------------------------------------------------*/

package amauricebot;

import java.util.ArrayList;

@Description(summary = "Classa para gerar gráficos de barras em html.")
public class BarGraph {
	private ArrayList<Long> m_values = new ArrayList<Long>();
	private long m_progressGoal = 0; // 0 = no particular goal
	private String m_barColor = "blue";
	private String m_aboveColor = "green";
	private String m_belowColor = "red";
	private String m_minXLabel = "";
	private String m_maxXLabel = "";

	private final static int Y_MARKERS = 50;

	public BarGraph() {
	}

	public void addValue(long value) {
		m_values.add(value);
	}

	public void setProgressGoal(long goal) {
		m_progressGoal = goal;
	}

	public void setBarColor(String color) {
		m_barColor = color;
	}

	public void setAboveColor(String color) {
		m_aboveColor = color;
	}

	public void setBelowColor(String color) {
		m_belowColor = color;
	}

	public void setMinXLabel(String label) {
		m_minXLabel = label;
	}

	public void setMaxXLabel(String label) {
		m_maxXLabel = label;
	}

	public int getSize() {
		return m_values.size();
	}

	public long getValue(int i) {
		return m_values.get(i);
	}

	public String getAsHtml() {
		long startValue = (m_values.isEmpty() ? 0 : m_values.get(0));
		long minValue = startValue;
		long maxValue = startValue;

		long progressValue = startValue;
		for (Long value : m_values) {
			minValue = Math.min(minValue, Math.min(progressValue, value));
			maxValue = Math.max(maxValue, Math.max(progressValue, value));
			progressValue += m_progressGoal;
		}
		long ymax = maxValue - minValue;
		long scale = (ymax / 500) + 1;
		ymax /= scale;

		// create chart
		StringBuilder builder = new StringBuilder();
		builder.append(
				"<div id='chart' style='position:relative;left:0px;top:0px;\n")
				.append("     width:562px;height:").append(ymax + 60)
				.append("px'>\n");

		// add X labels
		builder.append("<div style='position:absolute;left:30px;top:")
				.append(ymax + 30).append("px'><small>").append(m_minXLabel)
				.append("</small></div>\n");
		builder.append("<div style='position:absolute;right:30px;top:")
				.append(ymax + 30).append("px'><small>").append(m_maxXLabel)
				.append("</small></div>\n");

		// add marker labels
		for (int y = 0; y < ymax + 20; y += Y_MARKERS) {
			builder.append("<div style='position:absolute;left:0px;top:")
					.append(ymax + 18 - y).append("px'><small>")
					.append(y * scale + minValue).append("</small></div>\n");
		}

		// add chart area
		builder.append(
				"<div id='chartarea' style='position:absolute;left:30px;top:10px;\n")
				.append("     border:1px solid gray;background-color:white;width:502px;height:")
				.append(ymax + 20).append("px'>\n");

		// add marker lines
		for (int y = Y_MARKERS; y < ymax + 20; y += Y_MARKERS) {
			builder.append("<div style='position:absolute;left:0px;bottom:")
					.append(y).append("px;width:502px;height:1px;")
					.append(" background-color:lightgray;'></div>\n");
		}

		// add actual graph bars
		for (int colNum = 0; colNum < m_values.size(); colNum++) {
			long x = colNum * 10 + 2;
			long y1 = (startValue + (colNum * m_progressGoal) - minValue)
					/ scale;
			String color1 = m_barColor;
			long y2 = (m_values.get(colNum) - minValue) / scale - y1;
			String color2 = m_aboveColor;
			if (y2 < 0) {
				y1 += y2;
				y2 = -y2;
				color2 = m_belowColor;
			}

			if (y1 > 0) {
				builder.append("<div style='position:absolute;left:").append(x)
						.append("px;bottom:0px;width:8px;height:").append(y1)
						.append("px; background-color:").append(color1)
						.append(";'></div>\n");
			}

			if (y2 > 0) {
				builder.append("<div style='position:absolute;left:").append(x)
						.append("px;bottom:").append(y1)
						.append("px;width:8px;height:").append(y2)
						.append("px; background-color:").append(color2)
						.append(";'></div>\n");
			}
		}

		builder.append("</div>\n"); // end chart area
		builder.append("</div>\n"); // end chart

		return builder.toString();
	}
}