RealTimeClock/Watch/source/main.cpp

/*-----------------

Very simple RTC example with a cheesy watch face

\*----------------*/

#include<nds.h> 

#include <stdio.h>
#include <time.h>

const char* months[12] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};

//draw a watch hands
void DrawQuad(float x, float y, float width, float height) 
{ 

        glBegin(GL_QUADS); 
        glVertex3f(x - width / 2, y, 0); 
        glVertex3f(x + width / 2, y, 0); 
        glVertex3f(x  + width / 2, y  + height, 0); 
        glVertex3f(x - width / 2, y  + height, 0); 
        glEnd(); 
} 

int main() 
{    
        int hours, seconds, minutes; 

        //put 3D on top 
        lcdMainOnTop(); 

        // Setup the Main screen for 3D 
        videoSetMode(MODE_0_3D); 

        // Reset the screen and setup the view 
        glInit();

        // Set our viewport to be the same size as the screen 
        glViewport(0,0,255,191); 

        // Specify the Clear Color and Depth 
        glClearColor(0,0,0,31); 
        glClearDepth(0x7FFF); 

        consoleDemoInit();
        
 
        
        
        //ds specific, several attributes can be set here    
        glPolyFmt(POLY_ALPHA(31) | POLY_CULL_NONE); 
        
        // Set the current matrix to be the model matrix 
        glMatrixMode(GL_MODELVIEW); 
        glLoadIdentity(); 
        
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(70, 256.0 / 192.0, 0.1, 100);
        gluLookAt(      0.0, 0.0, 3.0,          //camera possition 
                                0.0, 0.0, 0.0,          //look at
                                0.0, 1.0, 0.0);         //up
        
        while (1) 
        { 

                time_t unixTime = time(NULL);
                struct tm* timeStruct = gmtime((const time_t *)&unixTime);
                
                hours = timeStruct->tm_hour;
                minutes = timeStruct->tm_min;
                seconds = timeStruct->tm_sec;
                
                //Push our original Matrix onto the stack (save state) 
                glPushMatrix();    

                //draw second hand 
                glColor3f(0,0,1); 
                glRotateZ(-seconds * 360 / 60); 
                glTranslatef(0,1.9,0); 
                DrawQuad(0,0,.2,.2); 

                // Pop our Matrix from the stack (restore state) 
                glPopMatrix(1); 

                //Push our original Matrix onto the stack (save state) 
                glPushMatrix();    

                //draw minute hand 
                glColor3f(0,1,0); 
                glRotateZ(-minutes * 360 / 60); 
                DrawQuad(0,0,.2,2); 

                // Pop our Matrix from the stack (restore state) 
                glPopMatrix(1); 

                //Push our original Matrix onto the stack (save state) 
                glPushMatrix();    

                //draw hourhand 
                glColor3f(1,0,0); 
                glRotateZ(-hours * 360 / 12); 
                DrawQuad(0,0,.3,1.8); 

                // Pop our Matrix from the stack (restore state) 
                glPopMatrix(1);

                printf("\x1b[2J%02i:%02i:%02i", hours, minutes, seconds);
                printf("\n%s %i %i", months[timeStruct->tm_mon], timeStruct->tm_mday, timeStruct->tm_year +1900);
                
                // flush to screen    
                glFlush(0);
                
                swiWaitForVBlank();
        } 

        return 0; 
}