Unexpected Color Change

papak

// Using Processing-3.3 // The stroke color defaults to black if no stroke command is issued. // In the code I was expecting the rectangle to have a black stroke color. // The ellipse has the expected blue stroke color. // The line has the expected green stroke color.

// Why does the rectangle have a green stroke color?

void setup() { size(480,420); background(220); }

void draw() { rect(100,200,100,100); // Expect this to have a black stroke color stroke(255,0,0); strokeWeight(3); stroke(0,0,255); ellipse(240,80, 115,115); stroke(0,255,0); line(5,5,400,310); }

GoToLoop

Move background() to top of draw(), maybe? :-/

papak

Putting "background(220);" as first line of the "draw" loop made no change. Thanks for the suggestion.

GoToLoop

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

papak

GoToLoop, THANK YOU! Also, where is the information for proper posting? PapaK

GoToLoop

You mean, where that post is located? It's the 2nd top announcement:
https://forum.Processing.org/two/discussions

papak

Actually I am looking for the "etiquette" rules and suggestions.

GoToLoop

https://forum.Processing.org/two/discussion/8042/processing-forum-rules-and-advices

papak

// Using Push and Pop around part of the code // displays the stroke colors as I am expecting, // the rectangle now has a black border. // Now I notice the the strokeCap(PROJECT) appears to be applied // to the line before the it. // Is this a bug or am I not understanding how the code should work? // I am not expecting something to change before I actually change it.

void setup() { size(480,420); //background(220); }

void draw() { background(220); rect(100,200,100,100); stroke(255,0,0); strokeWeight(5); stroke(0,0,255); ellipse(240,80, 115,115); stroke(0,255,0); line(30,150,430,150); pushMatrix(); strokeWeight(9); strokeCap(PROJECT); line(30,170,430,170); popMatrix(); stroke(0,0,0); strokeWeight(1); line(430,140,430,189); }

papak

// OK, I think I understand the coding format for the forum. Thanks. 

// Using Push and Pop around part of the code 
// displays the stroke colors as I am expecting, 
// The rectangle now has a black border. 
// Now I notice the the strokeCap(PROJECT) appears to be applied 
// to the line before it. 
// Is this a bug or am I not understanding how the code should work? 
// I am not expecting something to change before I actually change it.

void setup()
{
  size(480,420);
  //background(220);
}

void draw()
{
  background(220);
  rect(100,200,100,100);
  stroke(255,0,0);
  strokeWeight(5);
  stroke(0,0,255);
  ellipse(240,80, 115,115);
  stroke(0,255,0);
  line(30,150,430,150);
  pushMatrix();
  strokeWeight(9);
  strokeCap(PROJECT);
  line(30,170,430,170);
  popMatrix();
  stroke(0,0,0);
  strokeWeight(1);
  line(430,140,430,189);
}

GoToLoop

https://Processing.org/reference/pushStyle_.html

papak

// Using pushStyle and popStyle displays all objects as expected.
// Without them, the first "line" appears to be Projected, even though
// it is before the strokeCap(PROJECT) line.
// Any idea why this is occuring?

void setup()
{
  size(480,420);
  background(220);
}

void draw()
{
  rect(100,200,100,100);
  //pushStyle();
  stroke(255,0,0);
  strokeWeight(5);
  stroke(0,0,255);
  ellipse(240,80, 115,115);
  //popStyle();
  stroke(0,255,0);
  line(30,150,430,150);
  strokeWeight(9);
  strokeCap(PROJECT);
  line(30,170,430,170);
  stroke(0,0,0);
  strokeWeight(1);
  line(430,140,430,189);
}

GoToLoop

• Remember that draw() is called back at about 60 FPS.
• And all "style" commands are permanent until they're changed again.
• After the 1st draw() iteration, strokeCap() is set to PROJECT.
• Given your drawing is static (not an animation), it's a good idea to call noLoop() within setup():
  https://Processing.org/reference/noLoop_.html

papak

GoToLoop, Thank you. That makes perfect sense! PapaK