Hi I need help!!

[fugher]

I really need to figures out how to draw this.

http://www.dropshots.com/zoom.html?large=http://media11.dropshots.com/photos/987629/20120313/b_103409.jpg

This is one curve, but it is scaled by a different amount as the angles increase in the loop. The curve also goes through more angles. We see 4 * 360 degrees plotted here.

Here is what I have. But I still need a lot to work on this.

#include <math.h>
#include <GL/glut.h>
#include "Graphics.h"

void drawAxes(void);
void drawSine(void);

void drawScene(void) {
    clearWindow();
    drawAxes();
    drawSine();
    glEnd();
    glFlush();
}

int main(int argc, char ** argv) {
    GraphicsSetup(argc, argv);
    glutDisplayFunc(drawScene);
    glutMainLoop();
}

void drawAxes(void) {
    setColor(BLACK);
    drawLine(250,50,250,450);
    drawLine(0,250,500,250);
}

void drawSine(void) {
    double angle_radians;
    int x, y;
    const double PI = acos(-1.0);
    for(int angle = -360; angle <= 360; angle++) {
        x = (angle + 360) * 500.0/720.0;
        angle_radians = angle * PI / 180.0;
        y = 250 + sin(angle_radians) * 200;
        drawFilledCircle(x,y,2);
    }
}

[webJose]

If you are asking for the equation, it is something like this:

y = A * e^-ax * sin(bx)

where A = amplitude, a and b are constants and x is the angle in radians.

[fugher]

And where would I be able to use this in? Or how would it look like inside?

[webJose]

You use that equation to calculate the value of y, which is the vertical component of the dot belonging to the function.

[fugher]

How can I put that as code?


Can anyone help?