void drawXLabels()
{
  fill(70);
  textAlign(CENTER, TOP);
  
  // Use thin, gray lines to draw the grid
  stroke(0,120);
  strokeWeight(1);

  for (int row = 0; row <= XMAX; row++) {
    if (row % XINTERVAL == 0) {
      float x = map(row, XMIN, XMAX, PLOTX1, PLOTX2);
      textFont(font); 
      if (row == XMIN) {
          textAlign(LEFT, CENTER);                 // Align by the bottom
        } else if (row == XMAX) {
          textAlign(RIGHT, CENTER);            // Align by the top
        } else {
          textAlign(CENTER, CENTER);         // Center vertically
        }  
        fill(70);
        text(row, x, PLOTY2 + 10);
        line(x, PLOTY1, x, PLOTY2+5);
    }
  }
  
}

void drawYLabels()
{
  fill(70);
  textFont(font); 
  stroke(128);
  strokeWeight(1);

  for (float v = DATAMIN; v <= DATAMAX; v += YINTERVAL) {
    if (v % YINTERVAL == 0) {     // If a tick mark
      float y = map(v, DATAMIN, DATAMAX, PLOTY2, PLOTY1);  
      if (v % YINTERVAL == 0) {        // If a major tick mark
        if (v == DATAMIN) {
          textAlign(RIGHT);                 // Align by the bottom
        } else if (v == DATAMAX) {
          textAlign(RIGHT, TOP);            // Align by the top
        } else {
          textAlign(RIGHT, CENTER);         // Center vertically
        }
        text(floor(v), PLOTX1 - 7, y);
        line(PLOTX1 - 4, y, PLOTX1, y);     // Draw major tick
      } else {
        line(PLOTX1 - 2, y, PLOTX1, y);   // Draw minor tick
      }
    }
  }
}


void drawGrid()
{
  stroke(255, 100); 
  strokeWeight(.5); 
  for(int i = 0; i < width; i = i + gridInterval)
  {
    line(i,0,i,gridInterval*6);      
    for(int k = 0; k < gridInterval*6; k = k + gridInterval)
    {
      line(0,k,width,k);
    }   
  }  
}

void drawPlot()
{
  noStroke();
  fill(70); 
  rectMode(CORNERS);
  rect(PLOTX1,PLOTY1,PLOTX2,PLOTY2); 
}

void drawAxisLabels() {
  fill(70);
  textLeading(15);
  textFont(font);  
  textAlign(CENTER, CENTER);
  // Use \n (enter/linefeed) to break the text into separate lines
  text("Y-AXIS\nLABEL", LABELX, (PLOTY1+PLOTY2)/2);
  textAlign(CENTER, CENTER);
  text("X-AXIS LABEL", (PLOTX1+PLOTX2)/2, LABELY);
}

void drawTitle() {
  fill(70);
  textAlign(LEFT);
  textFont(font);
  text("SPL DATA VISUALIZATION", PLOTX1, PLOTY1 - 5);
  textAlign(RIGHT);
  text("MAT 259", PLOTX2, PLOTY1 - 5);  
}