protected void DrawSeries(Bitmap bufferBitmap, float vMin, float vMax)
{
if (bufferBitmap == null)
{
return;
}
int w = bufferBitmap.Width;
int h = bufferBitmap.Height;
float x1 = ChartPadding.Left, x2 = w - ChartPadding.Right;
float y1 = ChartPadding.Top, y2 = h - ChartPadding.Bottom;
int n = TickCount, m = CategoryCount;
using (Graphics graphics = Graphics.FromImage(bufferBitmap))
using (StringFormat stringFormat1 = new StringFormat()
{
Alignment = StringAlignment.Far, LineAlignment = StringAlignment.Far
})
using (StringFormat stringFormat2 = new StringFormat()
{
Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center
})
using (SolidBrush brush1 = new SolidBrush(Color.Black))
using (SolidBrush brush2 = new SolidBrush(Color.White))
using (Pen pen1 = new Pen(Color.Black, 2f))
using (Pen pen2 = new Pen(Color.Gray, 1f)
{
DashStyle = DashStyle.Dash
})
{
Padding chartPadding = ChartPadding;
SizeF innerSize = InnerSize;
graphics.Clip = new Region(new RectangleF(chartPadding.Left, chartPadding.Top, innerSize.Width + 1f, innerSize.Height + 1f));
int i = 0;
foreach (KeyValuePair <object, List <float> > keyValuePair in Items)
{
object key = keyValuePair.Key;
List <float> values = keyValuePair.Value;
Color color = ColorUtilities.GetDarkColor(i);
pen1.Color = color;
brush1.Color = color;
{
PointF q1, q2 = new PointF(float.NaN, float.NaN);
bool b3 = false;
for (int j = 0; j < n; j++) // tick
{
float y = GetValue(values, j);
if (float.IsNaN(y))
{
b3 = false;
}
else
{
q1 = q2;
q2 = ToPointF(bufferBitmap, j, n, ToSingle((y - vMin) / (vMax - vMin)));
if (PointValid(q1) && PointValid(q2))
{
DrawConnection(graphics, pen1, pen2, q1, q2, b3 ? InnerConnection : OuterConnection);
}
else if (PointValid(q2))
{
DrawPoint(graphics, pen1, brush1, brush2, stringFormat2, q2, j);
}
b3 = true;
}
}
graphics.DrawString($"[{i + 1}]", DefaultFont, brush1, q2.X, q2.Y, stringFormat1);
}
if (ViewPoints)
{
PointF q2 = new PointF(0, 0);
for (int j = 0; j < n; j++) // tick
{
float y = GetValue(values, j);
if (float.IsNaN(y))
{
continue;
}
q2 = ToPointF(bufferBitmap, j, n, ToSingle((y - vMin) / (vMax - vMin)));
if (PointValid(q2))
{
DrawPoint(graphics, pen1, brush1, brush2, stringFormat2, q2, j);
}
}
}
i++;
}
}
}
public static void DrawLegend(
Bitmap bitmap,
float minValue, float maxValue, string format,
ColorGradientEnum colorGradient, bool inverseGradient,
params string[] lines)
{
if (float.IsNaN(minValue) || float.IsNaN(maxValue))
{
return;
}
const int a = 12; // distance from right legend to right bitmap
const int b = 12; // distance from bottom legend to bottom bitmap
const int l = 16; // height of a text line
const int h = 60; // height of the color gradient indicator
const int w = 64; // width
const int d = 2; // distance from y to text string
int n = lines != null ? lines.Length : 0;
float x1 = bitmap.Width - a, x0 = x1 - w, x2 = x0;
float y4 = bitmap.Height - b, y3 = y4 - l, y2 = y3 - h, y1 = y2 - l, y0 = y1 - n * l;
using (Graphics graphics = Graphics.FromImage(bitmap))
{
// background
using (SolidBrush backgroundBrush = new SolidBrush(Color.FromArgb(0xF0, 0xF0, 0xF0)))
{
graphics.FillRectangle(backgroundBrush, x0, y0, w, h + (2 + n) * l);
}
// color gradient
using (Pen gradientPen = new Pen(Color.Black, 1f))
{
for (int i = 0; i <= h; i++)
{
float z = maxValue > minValue ? (float)i / h : 0.5f;
gradientPen.Color = ColorUtilities.GetColor(z, colorGradient, inverseGradient);
float y = y2 + i;
graphics.DrawLine(gradientPen, x0, y, x1, y);
}
}
// text
using (Pen textPen = new Pen(Color.Black, 1f))
using (SolidBrush textBrush = new SolidBrush(Color.Black))
using (StringFormat stringFormat = new StringFormat
{
Alignment = StringAlignment.Near, LineAlignment = StringAlignment.Near
})
{
Font font = Control.DefaultFont;
textBrush.Color = Color.Black;
textPen.Color = Color.Black;
for (int i = 0; i < n; i++)
{
graphics.DrawString(lines[i], font, textBrush, x2, y0 + i * l + d, stringFormat);
graphics.DrawRectangle(textPen, x0, y0 + i * l, w, l);
}
graphics.DrawString(minValue.ToString(format), font, textBrush, x2, y1 + d, stringFormat);
graphics.DrawString(maxValue.ToString(format), font, textBrush, x2, y3 + d, stringFormat);
graphics.DrawRectangle(textPen, x0, y1, w, h + 2 * l);
}
}
}