private void DrawLineChart(Graphics g, float[] data)
{
    if (data.Length < 2) return;
    
    PointF[] points = new PointF[data.Length];
    for (int i = 0; i < data.Length; i++)
    {
        points[i] = new PointF(i * scaleX, data[i] * scaleY);
    }
    
    g.DrawLines(Pens.Blue, points);
    
    // Рисование точек
    foreach (var point in points)
    {
        g.FillEllipse(Brushes.Red, point.X - 3, point.Y - 3, 6, 6);
    }
}

private void DrawBarChart(Graphics g, float[] data)
{
    float barWidth = this.Width / (float)data.Length;
    float maxValue = data.Max();
    float scale = this.Height / maxValue;
    
    for (int i = 0; i < data.Length; i++)
    {
        float barHeight = data[i] * scale;
        float x = i * barWidth;
        float y = this.Height - barHeight;
        
        g.FillRectangle(Brushes.Blue, x, y, barWidth - 2, barHeight);
        g.DrawRectangle(Pens.Black, x, y, barWidth - 2, barHeight);
    }
}

private void DrawPieChart(Graphics g, float[] data, string[] labels)
{
    float total = data.Sum();
    float startAngle = 0;
    Rectangle rect = new Rectangle(50, 50, 300, 300);
    
    Color[] colors = { Color.Red, Color.Blue, Color.Green, 
        Color.Yellow, Color.Orange };
    
    for (int i = 0; i < data.Length; i++)
    {
        float sweepAngle = (data[i] / total) * 360;
        
        using (SolidBrush brush = new SolidBrush(colors[i % colors.Length]))
        {
            g.FillPie(brush, rect, startAngle, sweepAngle);
            g.DrawPie(Pens.Black, rect, startAngle, sweepAngle);
        }
        
        startAngle += sweepAngle;
    }
}

private void DrawLegend(Graphics g, string[] labels, Color[] colors)
{
    int y = 10;
    for (int i = 0; i < labels.Length; i++)
    {
        g.FillRectangle(new SolidBrush(colors[i]), 10, y, 20, 15);
        g.DrawString(labels[i], this.Font, Brushes.Black, 35, y);
        y += 20;
    }
}

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace CSharpGraphicsApp
{
    public class Task07_SineGraph : Form
    {
        public Task07_SineGraph()
        {
            Text = "Задание 7 — График sin(x)";
            Size = new Size(600, 400);
            BackColor = Color.White;
            DoubleBuffered = true;
            Paint += Form1_Paint;
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            int width = ClientSize.Width;
            int height = ClientSize.Height;

            // Оси
            g.DrawLine(Pens.Black, 50, height - 50, width - 50, height - 50);
            g.DrawLine(Pens.Black, 50, 50, 50, height - 50);
            g.DrawString("X", SystemFonts.DefaultFont, Brushes.Black, width - 40, height - 45);
            g.DrawString("Y", SystemFonts.DefaultFont, Brushes.Black, 35, 35);

            // Тики по оси X
            for (int i = -3; i <= 3; i++)
            {
                float x = 50 + (i + 3) * ((width - 100) / 6f);
                g.DrawLine(Pens.Black, x, height - 55, x, height - 45);
                g.DrawString(i.ToString(), SystemFonts.DefaultFont,
                    Brushes.Black, x - 6, height - 40);
            }

            // Точки sin(x) от -π до π
            var points = new List<PointF>();
            for (float x = -(float)Math.PI; x <= Math.PI; x += 0.05f)
            {
                float y = (float)Math.Sin(x);
                float screenX = 50 + (x + (float)Math.PI) /
                    (2 * (float)Math.PI) * (width - 100);
                float screenY = height - 50 - y * 80;
                points.Add(new PointF(screenX, screenY));
            }

            using (Pen pen = new Pen(Color.Red, 2))
                g.DrawLines(pen, points.ToArray());

            g.DrawString("y = sin(x)",
                new Font("Segoe UI", 10, FontStyle.Bold), Brushes.Red, width - 150, 20);
        }
    }
}