Trendline by angle

I use this tool in my manual trading and I really like it (Insert - Lines - Trendline by Angle).

Is there anyway to this in code? If there is, I haven't found it.

Me neither. I tried ObjectSet(<name>,OBJPROP_ANGLE,<angle>) and it doesn't seem to work.

I also attempted to calc the time/price coordinate of the second point using trigonometry, e.g.

double pi = 3.1415926535;
datetime X0 = <datetime of start point>;
double Y0 = <price of start point>;
double theta = <desired angle of trendline in degrees>;
datetime X1 = X0 - 10;
double Y1 = Y0 + 10 * MathTan(theta*pi/180);
ObjectCreate("objname",OBJ_TREND,X0,Y0,X1,Y1);

This gives a mathematically correct value for Y1, but the problem lies in the way in which the MT4 window is scaled with regard to time and price. (This changes according to the zoom level). The TrendlineByAngle facility somehow adjusts for this.