BarChart

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace DrawLib_test
{
    class BarChart
    {
        float[] values;
        Pen pen;
        int h, distance;
        float width, height;

        public BarChart(params int[] values)
        {
            this.values = new float[values.Length];
            for (int i = 0; i < values.Length; i++)
            {
                this.values[i] = (float)values[i];
            }
        }

        public void DrawChart(Graphics g, Rectangle area)
        {
            h = area.Width;
            distance = 25;
            height = ((area.Height / values.Length - 1) - distance) < 50 ?
                ((area.Height / values.Length - 1) - distance) : 50;
            pen = new Pen(Color.Red);
            float max = values.Max();

            for (int i = 0; i < values.Length; i++)
            {
                float sum = values.Sum();
                width = (values[i] / sum) * (h / max);

                Rectangle rect = new Rectangle(20, distance, (int)width, (int)height);
                distance += (int)height + 10;
                g.FillRectangle(pen.Brush, rect);
            }
        }
    }
}