added sine plotting

Author: OverPoweredDev

cpp_implementation/sine_encoder/plotter.cpp

@@ -2,9 +2,9 @@
 #include <graphics.h>
 #define PI 3.141
 
-void drawAxes(int offset_x, int freq) {
+void drawAxes(int offset_x, int period) {
     line(0, getmaxy() / 2, getmaxx(), getmaxy() / 2);
-    for(int x = offset_x; x < getmaxx(); x += freq){
+    for(int x = offset_x; x < getmaxx(); x += period){
         circle(x, getmaxy()/2, 3);
     }
     line(offset_x, 0, offset_x, getmaxy());
@@ -13,8 +13,10 @@ void drawAxes(int offset_x, int freq) {
 void sine_wave(double offset_x, double amplitude, double phase_shift, double time_period){
     double y;
     for (double angle = 0, x = offset_x; x < getmaxx(); x += 1, angle += 1) {
+        // angle = 0, x = offset_x for wave starting at origin,
+        // angle = -phase_shift, x = offset_x-phase_shift for wave starting at 0 degrees
         //angle is in degrees, not radians
-//        y = amplitude * sin((((360.0/151.0)*(angle + rads)) * PI / 180.0));(2*PI/time_period)*
+        //x is also basically just angle, its just easier to manage them separately cause graphics.h has a weird graph system
         y = amplitude * sin((angle + phase_shift)*(2*PI/time_period));
         y = getmaxy()/2 - y;
 
@@ -29,13 +31,13 @@ int main() {
     double offset_x = 100;
 
     //assignment variables
-    double rollnum = 49.0;
+    double roll_num = 49.0;
     int amplitude = 100;
 //    double time_period = 360;
 //    double rads = 0;
-    double time_period = 200 - rollnum;       // 151
-    double rads = rollnum/20.0;             // 2.45
-    double phase_shift = rads*(time_period/(2*PI));   // 140.4
+    double time_period = 200 - roll_num;                // 151
+    double rads = roll_num/20.0;                        // 2.45
+    double phase_shift = rads*(time_period/(2*PI));     // 140.4
 
     initgraph(&gd, &gm, nullptr);
     drawAxes(offset_x, time_period);