三角格子の擬似カラープロットを行う.

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Sub Test_Plt_Tripcolor()
    Const N = 256
    Dim X(N - 1) As Double, Y(N - 1) As Double, Z(N - 1) As Double
    Dim I As Integer
    '-- Make data
    For I = 0 To N - 1
        X(I) = -3 + 6 * Rnd()
        Y(I) = -3 + 6 * Rnd()
        Z(I) = (1 - X(I) / 2 + X(I) ^ 5 + Y(I) ^ 3) * Exp(-X(I) ^ 2 - Y(I) ^ 2)
    Next
    '-- Plot
    Call Plt.Plot(N, X(), Y(), "o", "markersize=2, color='grey'")
    Call Plt.Tripcolor(N, X(), Y(), Z())
    Call Plt.Set_xlim(-3, 3)
    Call Plt.Set_ylim(-3, 3)
    Call Plt.Show
End Sub