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Using rotate() to roll rectangale on the X while keeping pitch on the Y

[3 Replies]
- 10-Jun-2013 09:14 PM
- Forum: Programming Questions
Hello,

I'm trying to make an artificial horizon indicator. So far I can control the Pitch. but when I try to rotate the rectangle on the top center it all goes crazy.

I tried this from an example I found. it seems to work here, but not in my code
1. // Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
2. // Example 14-5: Rectangle rotating around center
3. void setup() {
  size(300,300);
  }
4. void draw() {
  background(255);
  stroke(0);
  fill(175);
  
  // Translate origin to center
  translate(width/2,height/8-100+mouseY+60);
  
  // The greek letter, theta, is often used as the name of a variable to store an angle
  // The angle ranges from 0 to PI, based on the ratio of mouseX location to the sketch's width.
  float theta = PI*mouseX / width;
  
  // Rotate by the angle theta
  //translate(0,0-mouseY);
  rotate(theta);
  
  // Display rectangle with CENTER mode
  rectMode(CENTER);
  rect(0+50,0,100,100);
  }
this is the code I have so far
1. float Pitch;
  float Roll;
  float newX = map(mouseX, 0, 1000, -150, 150);
  float newY = map(mouseY, 0, 300, -150, 150);
  
  void setup()
  {
  size(1000,800);
  rectMode(CENTER);
  smooth();
  }
2. void draw()
  {
  //println("X = " + mouseX);
  //println("Y = " + mouseY);
  
     Pitch= mouseY - 150;
     Roll = (PI/2)*mouseX;
     Horizon();
  
  }
3. void Horizon()
  {
4. noStroke();
  fill(0, 180, 255); //Fill Sky color
  rect(500, 200, 300, 300);
  
  fill(252, 130, 8); //Fill ground color
  rect(500,Pitch+300,300, 300);
  translate(0,0);
  // rotate(Roll); //<- this is my problem
  
  stroke(250); // Draw cross hairs for visual alignment
  line(375,200,625, 200);
  line(500,75,500, 325);
  
  noStroke();//Cover up background
  fill(205);
  rect(500, 600, 300, 500);
  rect(500, 0, 300, 100);
  
  }

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