wrong format

joeblogs

hey guys, new to java. only started C++ a couple of weeks ago. im having trouble trying to get a class to work, but keep getting null pointer errors. cant quite figure out what im not setting up wrong. can anyone see from the code what im doing wrong. Cheers excuse all the commented out stuff i was just trying to narrow down the problem

(Code in comments)

joeblogs

well thats a load of garbage ill try again

GoToLoop

https://forum.Processing.org/two/discussion/15473/readme-how-to-format-code-and-text

joeblogs

try again

hey guys, new to java. only started C++ a couple of weeks ago. im having trouble trying to get a class to work, but keep getting null pointer errors. cant quite figure out what im not setting up wrong. can anyone see from the code what im doing wrong. Cheers excuse all the commented out stuff i was just trying to narrow down the problem

import processing.serial.*;

Serial port;  // Create object from Serial class
int[] serialInArray = new int[2]; // Where we'll put what we receive
int serialCount = 0;     // A count of how many bytes we receive
boolean firstContact = false;

//float TPS1;
//float TPS2;
//float inputVar = 4000.0;

class Dial 
{
  float inputVar = 4000;
  int xPos = 0;
  int yPos = 0;
  int diameter = 0;

  //void dialSetup(int x, int y, int d) 
  //{    
  //  xPos = x;
  //  yPos = y;
  //  diameter = d;
  //}  // end of dial setup

  //void dialSerial() 
  //{
  //int inByte = port.read();
  //if (firstContact == false) 
  //{
  //  if (inByte == 'A') 
  //  {
  //    port.clear();   // clear the serial port buffer
  //    firstContact = true;  // you've had first contact from the microcontroller
  //    port.write('A');  // ask for more
  //  }
  //}
  //else 
  //{
  //  serialInArray[serialCount] = inByte;
  //  serialCount++;
  //  if (serialCount > 1 ) 
  //  {
  //    //port.clear();
  //    inputVar = ((serialInArray[0] << 8) + (serialInArray[1]));
  //    //TPS2 = ((serialInArray[2] << 8) + (serialInArray[3]));
  //    //println(TPS1);
  //    //println(TPS2);
  //    port.write('A');
  //    serialCount = 0;
  //  }
  //}
  //}  //end of dial serial    


  void dialStart(int x, int y, int d) 
  {
    int xPos = x;
    int yPos = y;
    int diameter = d;
    // draw circle  
    fill(0);                                 // circle colour
    strokeWeight(1);                         // thickness of circle outline
    stroke(255);                             // colour of circle
    ellipse(xPos, yPos, diameter, diameter); // position of circle
    // draw needles
    float ratio = map(inputVar, 0, 4095, 0, PI);
    stroke(255);
    strokeWeight(4);
    line(xPos, yPos, xPos - (cos(ratio)*69), yPos - (sin(ratio)*69));
    //draw text 
    PFont fonta;
    fonta = loadFont("Latha-32.vlw");
    int roundedVar = round(inputVar);         // round var for text display
    fill(100);                                // text colour  
    textFont(fonta, 25);                       // font
    textAlign(CENTER, CENTER);                // position   
    text(100 * roundedVar / 4095, xPos, yPos + 30);
    //  Draw the minute ticks and labels 
    stroke(255, 0, 0);    
    fill(255, 0, 0);
    strokeWeight(4);
    PFont fontb;
    fontb = loadFont("Latha-32.vlw");
    for (int a = 180; a <= 360; a+=18)
    {
      float i = xPos + ( cos(radians(a)) * 90 );
      float j = yPos + ( sin(radians(a)) * 90 );
      textFont(fontb, 12);
      text(ceil((a - 180)/1.8), i, j);
    }
    for (int a = 180; a <= 360; a+=10) 
    {
      float i = xPos + ( cos(radians(a)) * 74 );
      float j = yPos + ( sin(radians(a)) * 74 );
      point(i, j);
    }
  } // // end of dialStart
};  // end of class


Dial dial1;

//Dial dial2;

void setup() {
  size(750, 250);  // Set the font and its size (in units of pixels)
  stroke(255);
  smooth();
  port = new Serial(this, "COM5", 115200); 
  //dial1.dialSerial();
  //dial1.dialSetup(125, 125, 160);
  //dial2.dialSetup(TPS2, 125, 300, 160);

  //fonta = loadFont("Latha-32.vlw");
}


void draw() {

  background(0);    // black background
  //dial1.dialSetup(125, 125, 160);
  dial1.dialStart(125, 125, 160);
  //dial2.dialStart();
}


//void serialEvent (Serial port) 
//{
//  int inByte = port.read();
//  if (firstContact == false) 
//  {
//    if (inByte == 'A') 
//    {
//      port.clear();   // clear the serial port buffer
//      firstContact = true;  // you've had first contact from the microcontroller
//      port.write('A');  // ask for more
//    }
//  }
//  else 
//  {
//    serialInArray[serialCount] = inByte;
//    serialCount++;
//    if (serialCount > 1 ) 
//    {
//      //port.clear();
//      dial1.inputVar = ((serialInArray[0] << 8) + (serialInArray[1]));

//      //TPS2 = ((serialInArray[2] << 8) + (serialInArray[3]));
//      //println(TPS1);
//      //println(TPS2);
//      port.write('A');
//      serialCount = 0;
//    }
//  }
//}

joeblogs

never mind all good, just needed a coffee

dial1 = new Dial();

did the trick, little bit different from C++