Often it may not be convenient to load chart data from a file. For example, if the data is created from within the program using a mathematical calculation, it makes more sense to read it into the chart directly instead of saving it to a file and then reading it again. Not only can this method be quicker, it can also be quite easy to program.
The following example creates a regular grid dataset using a precalculated two-dimensional array and then transfers it to the chart:
To write code in Visual Basic
Visual Basic |
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' Calculate array Dim Rnd As Random = New Random() Dim m,n As Integer Dim z(20,30) As Double For m = 0 To 30 For n = 0 To 20 If m Mod 2 = 0 Then Z(n, m) = m * 5 * Rnd.NextDouble() + Math.Sqrt(2 * m * m * n) Else Z(n, m) = m * -5 * Rnd.NextDouble() + Math.Sqrt(2 * m * n) End If Next n Next m ' create dataset and put it to the chart Dim gridset As Chart3DDataSetGrid gridset=New Chart3DDataSetGrid( 0, 0, 1, 1, z) C1Chart3D1.ChartGroups(0).ChartData.Set = gridset |
To write code in C#
C# |
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// Calculate array Random rnd = new Random(); double[,] z = new double[21, 31]; for( int m = 0; m<31; m++) for( int n = 0; n<21; n++) { if(m%2==0) z[n,m]= m * 5 * rnd.NextDouble() + Math.Sqrt(2 * m * m * n); else z[n,m]= m * -5 * rnd.NextDouble() + Math.Sqrt(2 * m * n); } // create dataset and put it to the chart Chart3DDataSetGrid gridset=new Chart3DDataSetGrid(0,0,1,1,z); C1Chart3D1.ChartGroups[0].ChartData.Set = gridset; |