public RenderData CreateRenderData(Graph graph, Graphics g, int width, int height)
{
RenderData data = new RenderData
{
Graph = graph,
g = g,
Width = width,
Height = height,
AxisPen = new Pen(Color.Black),
AxisFont = new Font(FontFamily.GenericSansSerif, 10.0f),
AxisBrush = new SolidBrush(Color.Black),
AxisStringFormat = "#,##0.##",
LegendFont = new Font(FontFamily.GenericSansSerif, 10.0f),
LegendBrush = new SolidBrush(Color.Black),
LargeTickLength = 10,
SeriesPens = graph.Series.Select(s => new Pen(s.Color)).ToArray()
};
data.LegendFontMetrics = g.MeasureString("Title of a Series", data.LegendFont);
int legendWidth = (int)(data.LegendFontMetrics.Width + 20);
data.LegendRect = new Rectangle(width - legendWidth, 0, legendWidth, height);
SizeF axisFontMetrics = g.MeasureString(graph.ActualYMaximum.ToString(data.AxisStringFormat), data.AxisFont);
data.AxisYRect = new Rectangle(0, 0, (int)(axisFontMetrics.Width + data.LargeTickLength), (int)(height - axisFontMetrics.Height - data.LargeTickLength));
data.AxisXRect = new Rectangle(data.AxisYRect.Right, data.AxisYRect.Bottom, width - data.AxisYRect.Left - data.LegendRect.Width, (int)(axisFontMetrics.Height + data.LargeTickLength));
data.GraphRect = new Rectangle(data.AxisYRect.Right, data.AxisYRect.Top, width - data.AxisYRect.Width - data.LegendRect.Width,
height - data.AxisYRect.Top - data.AxisXRect.Height);
data.XMin = data.Graph.ActualXMinimum;
data.XMax = data.Graph.ActualXMaximum;
data.XInterval = data.Graph.ActualXInterval;
if (Math.Abs(data.XMax - data.XMin) < 0.0001)
{
data.XPixelInterval = width / 10.0;
data.XPixelsPerValue = 0.0;
}
else
{
data.XPixelInterval = Math.Max(1.0, data.GraphRect.Width / ((data.XMax - data.XMin) / data.XInterval));
data.XPixelsPerValue = data.GraphRect.Width / (data.XMax - data.XMin);
}
data.YMin = data.Graph.ActualYMinimum;
data.YMax = data.Graph.ActualYMaximum;
data.YInterval = data.Graph.ActualYInterval;
if (Math.Abs(data.YMax - data.YMin) < 0.0001)
{
data.YPixelInterval = height / 10.0;
data.YPixelsPerValue = 0.0;
}
else
{
data.YPixelInterval = Math.Max(1.0, data.GraphRect.Height / ((data.YMax - data.YMin) / data.YInterval));
data.YPixelsPerValue = data.GraphRect.Height / (data.YMax - data.YMin);
}
return data;
}
private void RenderLegend(RenderData data)
{
Graphics g = data.g;
int seriesCount = 0;
int y = 0;
foreach (Series series in data.Graph.Series)
{
if (series.Visible)
{
g.DrawLine(data.SeriesPens[seriesCount], data.LegendRect.Left, y + (data.LegendFontMetrics.Height / 2), data.LegendRect.Left + 20, y + (data.LegendFontMetrics.Height / 2));
g.DrawString(data.Graph.Series[seriesCount].Title, data.LegendFont, data.LegendBrush, data.LegendRect.Left + 22, y);
y += (int)(data.LegendFontMetrics.Height + 5);
}
seriesCount++;
}
}
private void RenderGraphData(RenderData data)
{
Graphics g = data.g;
int seriesCount = 0;
foreach (Series series in data.Graph.Series)
{
if (series.Visible && series.DataPoints.Count > 0)
{
Point lastPoint = ToPixels(data, series.DataPoints.First());
foreach (DataPoint dp in series.DataPoints)
{
Point pt = ToPixels(data, dp);
g.DrawLine(data.SeriesPens[seriesCount], lastPoint, pt);
lastPoint = pt;
}
}
seriesCount++;
}
}
public void RenderXAxis(RenderData data)
{
Graphics g = data.g;
StringFormat stringFormat = new StringFormat
{
Alignment = StringAlignment.Center,
LineAlignment = StringAlignment.Near
};
using (stringFormat)
{
g.DrawLine(data.AxisPen, data.AxisXRect.Left, data.AxisXRect.Top, data.AxisXRect.Right, data.AxisXRect.Top);
double xVal = data.XMin;
for (double x = data.AxisXRect.Left; x <= data.AxisXRect.Right; x += data.XPixelInterval)
{
g.DrawLine(data.AxisPen, (int)x, data.AxisXRect.Top, (int)x, data.AxisXRect.Top + data.LargeTickLength);
if (data.XPixelsPerValue != 0.0)
{
g.DrawString(xVal.ToString(data.AxisStringFormat), data.AxisFont, data.AxisBrush,
new PointF((float)x, data.AxisXRect.Top + data.LargeTickLength), stringFormat);
}
xVal += data.XInterval;
}
}
}
public void Render(Graph graph, Graphics g, int width, int height)
{
g.Clear(Color.White);
using (RenderData data = CreateRenderData(graph, g, width, height))
{
RenderYAxis(data);
RenderXAxis(data);
RenderGraphData(data);
RenderLegend(data);
_lastData = data;
}
}
private Point ToPixels(RenderData data, DataPoint dp)
{
double x = data.GraphRect.Left + ((dp.XValue - data.XMin) * data.XPixelsPerValue);
double y = data.GraphRect.Bottom - ((dp.YValue - data.YMin) * data.YPixelsPerValue);
return new Point((int)x, (int)y);
}
private void RenderLegend(RenderData data)
{
Graphics g = data.g;
int seriesCount = 0;
int y = 0;
foreach (Series series in data.Graph.Series)
{
if (series.Visible)
{
g.DrawLine(data.SeriesPens[seriesCount], data.LegendRect.Left, y + (data.LegendFontMetrics.Height / 2), data.LegendRect.Left + 20, y + (data.LegendFontMetrics.Height / 2));
g.DrawString(data.Graph.Series[seriesCount].Title, data.LegendFont, data.LegendBrush, data.LegendRect.Left + 22, y);
y += (int)(data.LegendFontMetrics.Height + 5);
}
seriesCount++;
}
}
private void RenderGraphData(RenderData data)
{
Graphics g = data.g;
int seriesCount = 0;
foreach (Series series in data.Graph.Series)
{
if (series.Visible && series.DataPoints.Count > 0)
{
Point lastPoint = ToPixels(data, series.DataPoints.First());
foreach (DataPoint dp in series.DataPoints)
{
Point pt = ToPixels(data, dp);
g.DrawLine(data.SeriesPens[seriesCount], lastPoint, pt);
lastPoint = pt;
}
}
seriesCount++;
}
}
public void RenderYAxis(RenderData data)
{
Graphics g = data.g;
StringFormat stringFormat = new StringFormat
{
Alignment = StringAlignment.Far,
LineAlignment = StringAlignment.Center
};
using (stringFormat)
{
g.DrawLine(data.AxisPen, data.AxisYRect.Right, data.AxisYRect.Top, data.AxisYRect.Right, data.AxisYRect.Bottom);
double yVal = data.YMin;
for (double y = data.AxisYRect.Bottom; y >= data.AxisYRect.Top; y -= data.YPixelInterval)
{
g.DrawLine(data.AxisPen, data.AxisYRect.Right, (int)y, data.AxisYRect.Right - data.LargeTickLength, (int)y);
if (data.YPixelsPerValue != 0.0)
{
g.DrawString(yVal.ToString(data.AxisStringFormat), data.AxisFont, data.AxisBrush,
new PointF(data.AxisYRect.Right - data.LargeTickLength, (float)y), stringFormat);
}
yVal += data.YInterval;
}
}
}
