File content as of revision 3:688b62ff6474:

#include "Compass.h"

void Compass::display(void){
    //create a new thread to get and update compass - do later
    draw_compass(0);
}

void Compass::update(char c){
    //kill thread and go back
    if(c == 'y')
        this->setSelectedScreen(back);
}

//get direction
char * get_direction(double degrees){
    if(degrees >= 330 || degrees < 30)
        return "East";
    else if(degrees >= 30 && degrees <= 60)
        return "North-East";
    else if(degrees >= 60 && degrees < 120)
        return "North";
    else if(degrees >= 120 && degrees < 150)
        return "North-West";
    else if(degrees >= 150 && degrees < 210)
        return "West";
    else if(degrees >= 210 && degrees < 240)
        return "South-West";
    else if(degrees >= 240 && degrees < 300)
        return "South";
    else
        return "South-East";
}

//function that draws the compass on the screen
void Compass::draw_compass(double degrees){
    //variables
    int x_temp, y_temp;
    double rad = degrees * M_PI / 180;
    
    //calculate coordinates to point
    x_temp = X_CENTER + (int) (POINTER_LENGTH * cos(rad));
    y_temp = Y_CENTER + (int) (POINTER_LENGTH * (-sin(rad)));
    
    //draw the main circle and small one
    st7565->drawcircle(X_CENTER, Y_CENTER, RADIUS, 20);
    st7565->drawcircle(X_CENTER, Y_CENTER, 2, 20);
    
    //draw the lines
    st7565->drawline(X_CENTER, Y_CENTER, x_temp, y_temp, 20); //draw line from center to coordinates
    st7565->drawline(X_CENTER, Y_CENTER - RADIUS, X_CENTER, Y_CENTER - 15, 20); //north line
    st7565->drawline(X_CENTER, Y_CENTER + RADIUS, X_CENTER, Y_CENTER + 15, 20); //south line
    st7565->drawline(X_CENTER + RADIUS, Y_CENTER, X_CENTER + 15, Y_CENTER, 20); //east line
    st7565->drawline(X_CENTER - RADIUS, Y_CENTER, X_CENTER - 15, Y_CENTER, 20); //west line
    
    //draw the initials
    st7565->drawstring(X_CENTER - 2, 1, "N");
    st7565->drawstring(X_CENTER - 2, 7, "S");
    st7565->drawstring(X_CENTER + 21, 4, "E");
    st7565->drawstring(X_CENTER - 25, 4, "W");
    
    //display pointing direction
    st7565->drawstring(0, 2, "Pointing:");
    char * pointer = get_direction(degrees);
    st7565->drawstring(0, 4, pointer);
    
    //display degrees and radians in bottom left corner
    char s_deg[10], s_rad[10];
    sprintf(s_deg, "DEG:%g", degrees);
    sprintf(s_rad, "RAD:%.2g", rad);
    st7565->drawstring(1, 6, s_deg);
    st7565->drawstring(1, 7, s_rad);
    
    st7565->display();
}