Need help drawing tangent, log, and exponent curves (C# but somewhat language independant)

[WilliamsD]

Long story short, my class assignment is to make a graphing program in C# that draws sin, tangent, log, and exponent curves. My problem stems from the fact that I have had a serious lack of math instruction and don't know how to do this.

I have the sin curve finished from an in-class example we were given, but I don't know where to begin on the others.

Here is the code for the sin curve if it helps:

code:

g.Clear(Color.Black); // 'g' = graphics object DrawAxis(g); //Function I wrote, draws the axis on the graph as you would imagine for (int i = 0; i < this.Width; i++) // "this" refers to the custom graph control that this code is in {    double x = (i - this.ptOrigin.X);    double y = Math.Sin(x);    Points[i] = new Point(Convert.ToInt32(x + ptOrigin.X), Convert.ToInt32(y + ptOrigin.Y)); // "ptOrigin" is the center of my graph, used to offset the curve's location } //Scale up size for visibility g.ScaleTransform(2, 2); g.DrawCurve(p, Points); g.ResetTransform();

[ericfourfour]

I imaging you would treat the screen as a Cartesian plane and simply graph each function.

I really don't know what all of these functions would look like but I'm going to guess:

sine: f(x) = sin(x)
tangent: f(x) = tan(x)
log: f(x) = log(x)
exponent: f(x) = a^x

Just plug numbers into those functions to get the y. Plain and simple.

[klopyrev]

Its as simple as replacing the line:

double y = Math.Sin(x);

with one of:

double y = Math.Sin(x);
double y = Math.Tan(x);
double y = Math.Log(x); or double y = Log(a,x); (The first one is base E, second is base a)
double y = Math.Pow(a,x); (Base a)