Android Open Source - SDCardTrac Bar Graph View

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * This file is part of GraphView.//w  ww.  j  a va 2  s.co m
 *
 * 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);
            }
    }
  }

  @SuppressWarnings("deprecation")
  @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(formatLabel(values[i].getY(), false, 0, 0), (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;
  }

    @Override
    protected double transformPointToSample(double point, float border, int numPoints) {
        double horstart = 0;
        float colwidth = ((getWidth() - 1) - (2 * border)) / numPoints;
        double x = point - horstart;
        x = Math.floor(x / colwidth);
        return x;
    }
}

Java Source Code List

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