我有一个基本的 asp.net 图表写入响应流。
将 BackColor 更改为Color.Transparent并且每个文本都会自动变为粗体。搜索了许多有关此问题的帖子/论坛，但找不到任何解决方案。
这是我的图表生成器代码。
public static void BuildChart(Chart chart, IEnumerable<MultiMeasureData> source, Measure[] measures,bool transparent)
{
var ca = chart.ChartAreas.FirstOrDefault();
if (ca == null)
chart.ChartAreas.Add(ca = new ChartArea());
//added for transparency support.
ca.BackImageTransparentColor = Color.White;
ca.BackColor = Color.Transparent;
Series s = new Series("Ölçümler");
s.Font = new Font(FontFamily.GenericSansSerif, 10, FontStyle.Regular);
chart.Series.Add(s);
var leg = new Legend("legend1");
leg.Docking = Docking.Top;
//added for transparenct support.
leg.BackColor = Color.Transparent;
leg.Font = new Font("Arial", 8, FontStyle.Regular);
chart.Legends.Add(leg);
chart.Palette = System.Windows.Forms.DataVisualization.Charting.ChartColorPalette.Berry;
//Transparency.
chart.BackColor = transparent ? Color.Transparent : Color.White;
//chart.BackSecondaryColor = Color.FromArgb(187, 205, 237);
//chart.BackGradientStyle = System.Windows.Forms.DataVisualization.Charting.GradientStyle.LeftRight;
if (source != null)
{
if (measures.Length > 0)
{
ca.AxisX.LabelStyle.Format = "dd.MM.yy";
ca.AxisX.MinorGrid.Enabled = true;
ca.AxisX.MinorGrid.Interval = 12;
ca.AxisX.MinorGrid.IntervalType = DateTimeIntervalType.Hours;
ca.AxisX.MinorGrid.LineColor = Color.LightGray;
ca.BackGradientStyle = System.Windows.Forms.DataVisualization.Charting.GradientStyle.HorizontalCenter;
// ca.BackColor = Color.FromArgb(134, 218, 239);
ca.AxisY.LabelStyle.Format = "{0}" + measures.First().Type.Unit;
ca.AxisY.LabelStyle.ForeColor = Color.Black;
ca.AxisY.LabelStyle.Font = new Font(FontFamily.GenericSansSerif, 10, FontStyle.Regular);
ca.AxisX.LabelStyle.ForeColor = Color.Black;
ca.AxisX.LabelStyle.Font = new Font(FontFamily.GenericSansSerif, 10, FontStyle.Regular);
ca.AxisX.MajorGrid.LineColor = Color.Silver;
ca.AxisY.MajorGrid.LineColor = Color.Silver;
// var tm = (e - s).TotalMinutes / 10;
var data = source
.Select(a =>
{
var ret = new { Time = a.Time, Values = new double?[measures.Length] };
for (int i = 0; i < measures.Length; i++)
ret.Values[i] = a.Values[i].HasValue ? a.Values[i] / measures[i].Type.ValueScale:null;
return ret;
}
).OrderBy(a => a.Time);
var times = data.Select(a => a.Time).ToArray();
for (int i = 0; i < measures.Length; i++)
{
var serie = new Series(measures[i].Type.Name) { ChartType = SeriesChartType.Spline };
serie.XValueType = ChartValueType.DateTime;
serie.ShadowColor = Color.Gray;
serie.BorderWidth = 2;
serie.ShadowOffset = 1;
serie.Points.DataBindXY(times, new[] { data.Select(a => a.Values[i]).ToArray() });
serie.LegendText = measures[i].Type.Name;
serie.Font = new Font(FontFamily.GenericSansSerif, 10, FontStyle.Regular);
chart.Series.Add(serie);
}
}
}
}
这主要是流写入器方法使用BuildChart方法
public static void SaveChart(System.IO.Stream stream, System.Drawing.Imaging.ImageFormat format, int w, int h, IEnumerable<MultiMeasureData> source, Measure[] measures,bool transparent)
{
var c = new Chart() { Width = w, Height = h};
BuildChart(c, source, measures,transparent);
c.SaveImage(stream, format);
}
这是两个结果。
Background.White（透明参数为假）
Background.Transparent（透明参数为真）
