由于您正在制作图表，因此我有一个基本框架用于在控件中拟合值，如下例所示：
public struct MyPoint
{
public double X { set; get; }
public double Y { set; get; }
public PointF ToPoint()
{
return new PointF((float)X, (float)Y);
}
}
/// <summary>
/// For http://stackoverflow.com/questions/19459519/drawing-a-straight-line-from-points
/// </summary>
public partial class Form1 : Form
{
List<MyPoint> points;
public Form1()
{
InitializeComponent();
// Initialize points to draw
points=new List<MyPoint>(100);
for (int i=0; i<=100; i++)
{
double θ=2*Math.PI*(i/100.0);
double x=(1+θ/Math.PI)*Math.Cos(θ);
double y=(1+θ/Math.PI)*Math.Sin(θ);
points.Add(new MyPoint() { X=x, Y=y });
}
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
// smooth graphics
e.Graphics.SmoothingMode=SmoothingMode.AntiAlias;
// set margins inside the control client area in pixels
var margin=new System.Drawing.Printing.Margins(16, 16, 16, 16);
// set the domain of (x,y) values
var range=new RectangleF(-3, -3, 6, 6);
// scale graphics
ScaleGraphics(e.Graphics, pictureBox1, range, margin);
// convert points to pixels
PointF[] pixels=points.Select((v) => v.ToPoint()).ToArray();
// draw arrow axes
using (var pen=new Pen(Color.Black, 0))
{
pen.EndCap=System.Drawing.Drawing2D.LineCap.ArrowAnchor;
e.Graphics.DrawLine(pen, range.Left, 0.0f, range.Right, 0.0f);
e.Graphics.DrawLine(pen, 0.0f, range.Top, 0.0f, range.Bottom);
}
// draw bounding rectangle (on margin)
using (var pen=new Pen(Color.LightGray, 0))
{
pen.DashStyle=DashStyle.Dash;
e.Graphics.DrawRectangle(pen, Rectangle.Round(range));
}
// draw curve
using (var pen = new Pen(Color.Blue, 0))
{
//e.Graphics.DrawLines(pen, pixels);
e.Graphics.DrawCurve(pen, pixels);
}
}
/// <summary>
/// Scales the Graphics to fit a Control, given a domain of x,y values and side margins in pixels
/// </summary>
/// <param name="g">The Graphics object</param>
/// <param name="control">The Control</param>
/// <param name="domain">The value domain</param>
/// <param name="margin">The margin</param>
void ScaleGraphics(Graphics g, Control control, RectangleF domain, Margins margin)
{
// Find the drawable area in pixels (control-margins)
int W=control.Width-margin.Left-margin.Right;
int H=control.Height-margin.Bottom-margin.Top;
// Ensure drawable area is at least 1 pixel wide
W=Math.Max(1, W);
H=Math.Max(1, H);
// Find the origin (0,0) in pixels
float OX=margin.Left-W*(domain.Left/domain.Width);
float OY=margin.Top+H*(1+domain.Top/domain.Height);
// Find the scale to fit the control
float SX=W/domain.Width;
float SY=H/domain.Height;
// Transform the Graphics
g.TranslateTransform(OX, OY);
g.ScaleTransform(SX, -SY);
}
private void pictureBox1_SizeChanged(object sender, EventArgs e)
{
// redraw on resize
pictureBox1.Refresh();
}
}