BarGraphView.java

/**
 * This file is part of GraphView.
 *
 * GraphView 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.
 *
 * GraphView 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 GraphView.  If not, see <http://www.gnu.org/licenses/lgpl.html>.
 *
 * Copyright Jonas Gehring
 */

package com.jjoe64.graphview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint.Align;
import android.util.AttributeSet;

import com.jjoe64.graphview.GraphViewSeries.GraphViewSeriesStyle;

/**
 * Draws a Bar Chart
 * 
 * @author Muhammad Shahab Hameed
 */
public class BarGraphView extends GraphView {
	private boolean drawValuesOnTop;
	private int valuesOnTopColor = Color.WHITE;

	public BarGraphView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public BarGraphView(Context context, String title) {
		super(context, title);
	}

	// @Override
	// protected void drawHorizontalLabels(Canvas canvas, float border,
	// float horstart, float height, String[] horlabels, float graphwidth) {
	// // horizontal labels + lines
	// paint.setTextAlign(Align.CENTER);
	//
	// int hors = horlabels.length;
	// float barwidth = graphwidth/horlabels.length;
	// float textOffset = barwidth/2;
	// for (int i = 0; i < horlabels.length; i++) {
	// // lines
	// float x = ((graphwidth / hors) * i) + horstart;
	// paint.setColor(graphViewStyle.getGridColor());
	// canvas.drawLine(x, height - border, x, border, paint);
	//
	// if(getShowHorizontalLabels()) {
	// // text
	// x = barwidth*i + textOffset + horstart;
	// paint.setColor(graphViewStyle.getHorizontalLabelsColor());
	// canvas.drawText(horlabels[i], x, height - 4, paint);
	// }
	// }
	// }

	@Override
	public void drawSeries(Canvas canvas, GraphViewDataInterface[] values,
			float graphwidth, float graphheight, float border, double minX,
			double minY, double diffX, double diffY, float horstart,
			GraphViewSeriesStyle style) {
		float colwidth = graphwidth / (values.length);

		paint.setStrokeWidth(style.thickness);

		float offset = 0;

		// draw data
		for (int i = 0; i < values.length; i++) {
			float valY = (float) (values[i].getY() - minY);
			float ratY = (float) (valY / diffY);
			float y = graphheight * ratY;

			// hook for value dependent color
			if (style.getValueDependentColor() != null) {
				paint.setColor(style.getValueDependentColor().get(values[i]));
			} else {
				paint.setColor(style.color);
			}

			float left = (i * colwidth) + horstart - offset;
			float top = (border - y) + graphheight;
			float right = ((i * colwidth) + horstart) + (colwidth - 1) - offset;
			canvas.drawRect(left, top, right, graphheight + border - 1, paint);

			// -----Set values on top of graph---------
			if (drawValuesOnTop) {
				top -= 4;
				if (top <= border)
					top += border + 4;
				paint.setTextAlign(Align.CENTER);
				paint.setColor(valuesOnTopColor);
				canvas.drawText(String.valueOf(values[i].getY()),
						(left + right) / 2, top, paint);
			}
		}
	}

	public boolean getDrawValuesOnTop() {
		return drawValuesOnTop;
	}

	public int getValuesOnTopColor() {
		return valuesOnTopColor;
	}

	/**
	 * You can set the flag to let the GraphView draw the values on top of the
	 * bars
	 * 
	 * @param drawValuesOnTop
	 */
	public void setDrawValuesOnTop(boolean drawValuesOnTop) {
		this.drawValuesOnTop = drawValuesOnTop;
	}

	public void setValuesOnTopColor(int valuesOnTopColor) {
		this.valuesOnTopColor = valuesOnTopColor;
	}
}