Oh, it depended on setting color with Color command.. and had OnBuffer instead of RGB parametre.. so now it works:
Function BlendLine(X1,Y1,X2,Y2,Color24) X# = X1 Y# = Y1 Angle# = ATan2#(Y2-Y1,X2-X1) ; DebugLog "Angle: " + Angle# ; DebugLog "Cos/Ang: " + Cos#(Angle#) ; DebugLog "Sin/Ang: " + Sin#(Angle#) LockBuffer() While Int(X#) <> X2 Or Int(Y#) <> Y2 X# = X# + Cos#(Angle#) Y# = Y# + Sin#(Angle#) Pixel = ReadPixelFast(Int(X#),Int(Y#)) NewR = (GetR(Pixel) + GetR(Color24)) Shr 1 NewG = (GetG(Pixel) + GetG(Color24)) Shr 1 NewB = (GetB(Pixel) + GetB(Color24)) Shr 1 If NewR > 255 Then NewR = 255 If NewG > 255 Then NewG = 255 If NewB > 255 Then NewB = 255 WritePixelFast Int(X#), Int(Y#), GetRGB(NewR,NewG,NewB) ; DebugLog "X was " + Int(X#) + " , Y was " + Int(Y#) Wend UnlockBuffer() End Function Function GetRGB(R,G,B) Return $FF000000 Or R Shl 16 Or G Shl 8 Or B End Function Function GetR(RGB) Return RGB Shr 16 And %11111111 End Function Function GetG(RGB) Return RGB Shr 8 And %11111111 End Function Function GetB(RGB) Return RGB And %11111111 End Function