Processing 1.0 - Processing Discourse - point(i,j) doesn't work

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Index › Programming Questions & Help › Programs › point(i,j) doesn't work

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point(i,j) doesn't work (Read 520 times)

kirton

point(i,j) doesn't work
Jan 29^th, 2006, 8:19am

I'm just learning Processing and trying to make a color picker that changes between H,S,B modes.

I have two examples here, the first uses point(i,j) and works. In the second example point(i,j) doesn't work... but... line(i,j,127,127) works...

Could someone please help me?

NOTE: the second example uses the MyGUI class.

/*works*/
void setup(){
size(128,128);
noStroke();
colorMode(HSB, 255,255,255);
}

void draw(){
}

void mousePressed(){
for(int i=0; i<128; i++) {
for(int j=0; j<128; j++) {
stroke(mouseX*2, i*2, j*2);
point(i, j);
}
}
}

/* end works */

/*doesn't work*/

import mkv.MyGUI.*;

MyGUI gui;
MyGUICheckBox chkH;
MyGUICheckBox chkS;
MyGUICheckBox chkB;
char hsbVAR;

void setup(){
size(151,128);
framerate(24);
background(133);
smooth();
noStroke();
gui = new MyGUI(this);
chkH = new MyGUICheckBox(this,140,height/2-20,10,10);
chkS = new MyGUICheckBox(this,140,height/2,10,10);
chkB = new MyGUICheckBox(this,140,height/2+20,10,10);
gui.add(chkH);
gui.add(chkS);
gui.add(chkB);
colorMode(HSB,255,255,255);
}

void draw(){
}

void actionPerformed(ActionEvent e){
checkHSB(e);
}

void checkHSB(ActionEvent e){
if(e.getSource() == chkH){
chkS.checked(false);
chkB.checked(false);
hsbVAR = 'H';
}
else if(e.getSource() == chkS){
chkH.checked(false);
chkB.checked(false);
hsbVAR = 'S';
}
else if(e.getSource() == chkB){
chkH.checked(false);
chkS.checked(false);
hsbVAR = 'B';
}
drawColor(hsbVAR);
}

//----------------------

void drawColor(char e){
switch(e){
case 'H':
for(int i=0; i<128; i++) {
for(int j=0; j<128; j++) {
stroke(255,i*2,j*2);
point(i,j);
//line(i,j,i,j);
//line(i,j,127,127);
}
}
break;
case 'S':
for(int i=0; i<128; i++) {
for(int j=0; j<128; j++) {
stroke(i*2,255,j*2);
point(i,j);
//line(i,j,i,j);
//line(i,j,127,127);
}
}
break;
case 'B':
for(int i=0; i<128; i++) {
for(int j=0; j<128; j++) {
stroke(i*2,j*2,255);
point(i,j);
//line(i,j,i,j);
//line(i,j,127,127);
}
}
break;
}
}

/* end doesn't work */

Markavian

Re: point(i,j) doesn't work
Reply #1 - Apr 2^nd, 2006, 12:47am

I tested the second example, and yes - like you said, point fails to draw anything to the scene, where as line succeeds. Very odd.

I'm not sure how point works, not enough to help you out, but I might suggest that you could access the individual pixels directly instead of using point.

e.g. using set(x, y, color);

---testing---
Yes, that works ten times better/faster.

e.g.:
Code:


import mkv.MyGUI.*;
 
MyGUI gui;
MyGUICheckBox chkH;
MyGUICheckBox chkS;
MyGUICheckBox chkB;
char hsbVAR;
 
void setup(){
  size(151,128);
  framerate(24);
  background(133);
  smooth();    
  noStroke();
  gui = new MyGUI(this);
  chkH = new MyGUICheckBox(this,140,height/2-20,10,10);
  chkS = new MyGUICheckBox(this,140,height/2,10,10);
  chkB = new MyGUICheckBox(this,140,height/2+20,10,10);
  gui.add(chkH);
  gui.add(chkS);
  gui.add(chkB);
  colorMode(HSB,255,255,255);    
}
 
void draw(){
}
 
void actionPerformed(ActionEvent e){
  checkHSB(e);
}
 
void checkHSB(ActionEvent e){
  if(e.getSource() == chkH){
    chkS.checked(false);
    chkB.checked(false);
    hsbVAR = 'H';
  }
  else if(e.getSource() == chkS){
    chkH.checked(false);
    chkB.checked(false);
    hsbVAR = 'S';
  }
  else if(e.getSource() == chkB){
    chkH.checked(false);
    chkS.checked(false);
    hsbVAR = 'B';
  }
  drawColor(hsbVAR);
}
 
//----------------------
 
void drawColor(char e){
  switch(e){
    case 'H':
 for(int i=0; i<128; i++) {
   for(int j=0; j<128; j++) {
     set(i,j, color(255,i*2,j*2));
   }
 }
    break;
    case 'S':
 for(int i=0; i<128; i++) {  
   for(int j=0; j<128; j++) {
     set(i,j, color(i*2,255,j*2));
   }  
 }
    break;
    case 'B':
 for(int i=0; i<128; i++) {  
   for(int j=0; j<128; j++) {  
     set(i,j, color(i*2,j*2,255));
   }  
 }
    break;
  }
}

(So maybe MyGUI -is- having an effect on point, but I don't know what.)

PS: Interesting emulation of MyGUI radio buttons (as yet unimplemented, http://mkv25.net/MyGUI/ )

fry YaBB Moderator Offline Posts: 2623 mass, usa	Re: point(i,j) doesn't work Reply #2 - Apr 2^nd, 2006, 8:41pm issues with point() http://dev.processing.org/bugs/show_bug.cgi?id=121 http://dev.processing.org/bugs/show_bug.cgi?id=269

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