Shannon Larratt is Zentastic

For my second program for the Arduino/TouchShield, I experimented with some simple timer code, which includes a pre-calculated trig lookup table (for placing things rotated like a clock around the central point), a custom vector-font for drawing the text, and monitoring of the touch pad so it changes color when you click, and the little fast dot changes direction — awkwardly — when you double click. I’m just using a plastic straw as a stylus, so it takes a few tries to get the clicks sometimes, as you may notice in the video.

I think next I’ll do something “real” and useful rather than just testing functions — I feel fairly comfortable writing code. I think I’ll do a kitchen timer, and then after that, start experimenting with sensors and motors and LEDs and so on… Definitely fun!

Code follows after the break.

//Defines
#define kMaxTimeBetweenMultiTaps 250
 
//Coordinate lookup table for clock rotation, in seconds,
//center on 0,0 with 64 pix radius
int xClockLookup[] = {0, 7, 13, 20, 26, 32, 38, 43, 48, 52, 55, 58, 61, 63, 64,
64, 64, 63, 61, 58, 55, 52, 48, 43, 38, 32, 26, 20, 13, 7, 0, -7, -13, -20, -26,
-32, -38, -43, -48, -52, -55, -58, -61, -63, -64, -64, -64, -63, -61, -58, -55,
-52, -48, -43, -38, -32, -26, -20, -13, -7};
int yClockLookup[] = {-64, -64, -63, -61, -58, -55, -52, -48, -43, -38, -32,
-26, -20, -13, -7, 0, 7, 13, 20, 26, 32, 38, 43, 48, 52, 55, 58, 61, 63, 64, 64,
64, 63, 61, 58, 55, 52, 48, 43, 38, 32, 26, 20, 13, 7, 0, -7, -13, -20, -26, -32,
-38, -43, -48, -52, -55, -58, -61, -63, -64};
 
//Various global vars (probably some don't have to be)
long timeOfLastTap = 0;
unsigned char tapCount = 0;
 
int inreverse = 0;
 
unsigned long time;
int xlocsec;
int ylocsec;
int xlocmsec;
int ylocmsec;
 
unsigned long oldNum;
unsigned long thisNum;
unsigned long digOne;
unsigned long digTwo;
 
int textcolorR = 255;
int textcolorG = 255;
int textcolorB = 255;
int secballcolorR = 255;
int secballcolorG = 0;
int secballcolorB = 0;
 
void setup()
{
   background(0);
   drawMiddle();
}
 
void loop()
{
  POINT tapPoint;
  drawSeconds();
  if (touch_get_cursor(&tapPoint))
  {
    handleTap(&tapPoint);
  }
}
 
void drawSeconds()
{
  //seconds
  time = (millis() / 1000) % 60;
  xlocsec = xClockLookup[time] + 64;
  ylocsec = yClockLookup[time] + 64;
  stroke(secballcolorR, secballcolorG, secballcolorB);
  fill(secballcolorR, secballcolorG, secballcolorB);
  ellipse(xlocsec, ylocsec, 10, 10);
  //"milliseconds"
  time = (millis() / 17) % 60;
  if (inreverse == 1)
  {
    time = 59 - time;
  }
  xlocmsec = xClockLookup[time] + 64;
  ylocmsec = yClockLookup[time] + 64;
  stroke(255, 255, 0);
  fill(255, 255, 0);
  ellipse(xlocmsec, ylocmsec, 5, 5);
  //Seconds text counter
  thisNum = (millis() / 1000) % 60;
  if (thisNum != oldNum)
  {
    stroke(0);
    drawNum(digOne, 20, 30, 39, 49);
    drawNum(digOne, 20, 30, 40, 50);
    drawNum(digTwo, 20, 30, 69, 49);
    drawNum(digTwo, 20, 30, 70, 50);
 
    digOne = thisNum / 10;
    digTwo = thisNum % 10;
 
    stroke(textcolorR, textcolorG, textcolorB);
    drawNum(digOne, 20, 30, 39, 49);
    drawNum(digOne, 20, 30, 40, 50);
    drawNum(digTwo, 20, 30, 69, 49);
    drawNum(digTwo, 20, 30, 70, 50);
     
    oldNum = thisNum;
  }
  //pause and then erase
  delay(16);
  stroke(0);
  fill(0);
  ellipse(xlocsec, ylocsec, 10, 10);
  ellipse(xlocmsec, ylocmsec, 5, 5);
}
 
void drawMiddle()
{
  int xloc;
  int yloc;
  int xloc2;
  int yloc2;
  stroke(255);
  for (int i=0; i <= 11; i++)
  {
    xloc = (xClockLookup[i * 5] / 2) + 64;
    yloc = (yClockLookup[i * 5] / 2) + 64;
    xloc2 = (xClockLookup[i * 5] * 2 / 3) + 64;
    yloc2 = (yClockLookup[i * 5] * 2 / 3) + 64;
    line(xloc2, yloc2, xloc, yloc);
    stroke(128);
  }
}
 
int drawNum(unsigned long num, int sizex, int sizey, int x, int y)
{
  int x1;
  int x2;
  int x3;
  int y1;
  int y2;
  int y3;
  x1 = x;
  x2 = x + (sizex / 2);
  x3 = x + sizex;
  y1 = y;
  y2 = y + (sizey / 2);
  y3 = y + sizey;
  switch(num)
  {
    case 0:
      line(x1, y1, x3, y1);
      line(x3, y1, x3, y3);
      line(x3, y3, x1, y3);
      line(x1, y3, x1, y1);
      break;
    case 1:
      line(x2, y1, x2, y3);
      break;
    case 2:
      line(x1, y1, x3, y1);
      line(x3, y1, x3, y2);
      line(x3, y2, x1, y3);
      line(x1, y3, x3, y3);
      break;
    case 3:
      line(x1, y1, x3, y1);
      line(x3, y1, x1, y2);
      line(x1, y2, x3, y2);
      line(x3, y2, x1, y3);
      break;
    case 4:
      line(x2, y1, x1, y2);
      line(x1, y2, x3, y2);
      line(x3, y1, x3, y3);
      break;
    case 5:
      line(x3, y1, x1, y1);
      line(x1, y1, x1, y2);
      line(x1, y2, x3, y2);
      line(x3, y2, x1, y3);
      break;
    case 6:
      line(x3, y1, x1, y2);
      line(x1, y2, x1, y3);
      line(x1, y3, x3, y3);
      line(x3, y3, x3, y2);
      line(x3, y2, x1, y2);
      break;
    case 7:
      line(x1, y1, x3, y1);
      line(x3, y1, x1, y3);
      break;
    case 8:
      line(x1, y1, x3, y1);
      line(x3, y1, x3, y3);
      line(x3, y3, x1, y3);
      line(x1, y3, x1, y1);
      line(x1, y2, x3, y2);
      break;
    case 9:
      line(x1, y1, x3, y1);
      line(x3, y1, x3, y2);
      line(x3, y2, x1, y2);
      line(x1, y2, x1, y1);
      line(x3, y2, x1, y3);
      break;
  }  
}
 
//Borrowed in part from code by Josh Freeman
void handleTap(POINT *tapPoint)
{
    long currentTime = millis();
    long timeBetweenLastTwoTaps = currentTime - timeOfLastTap;
 
    // should the tap be considered part of a previous tap sequence?
    if (timeBetweenLastTwoTaps < kMaxTimeBetweenMultiTaps)
    {
        // tap is soon enough after previous tap
        // to continue the current tap sequence
        tapCount++;
         
        // restart the sequence if it's reached the limit
        if (tapCount > 2)
        {
            tapCount = 1;
        }
    }
    else
    {
        // too long since last tap - begin a new tap sequence
        tapCount = 1;
    }
 
    timeOfLastTap = currentTime;
 
    switch (tapCount)
    {
        case 1: // single-tap: change text and ball color
        {
            textcolorR = random(100, 255);
            textcolorG = random(100, 255);
            textcolorB = random(100, 255);
            secballcolorR = random(100, 255);
            secballcolorG = random(100, 255);
            secballcolorB = random(100, 255);
            //force redraw of digit
            oldNum = -1;
        }
        break;
 
        case 2: // double-tap: reverse mini-second rotator
        {
            if (inreverse == 1)
              {
              inreverse = 0;
              }
            else
              {
              inreverse = 1;
              }
        }
        break;
 
        default:
        {
            tapCount = 0;
        }
        break;
    }  
}