screenX() \ Language (API) \ Processing 1.0
Author: Casey Reas & Ben Fry
Description: Processing is an electronic sketchbook for developing ideas. It is a context for learning fundamentals of computer programming within the context of the electronic arts.
Keywords: Processing, Processing, Interactive Media, Electronic Arts, Programming, Java, Ben Fry, Casey Reas

Reference for Processing version 1.5. If you have a previous version, use the reference included with your software. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Javadoc.

Name | ### screenX()
Examples |
    void setup() {
      size(100, 100, P3D);
    }

    void draw() {
      background(204);

      float x = mouseX;
      float y = mouseY;
      float z = -100;

      // Draw "X" at z = -100
      stroke(255);
      line(x-10, y-10, z, x+10, y+10, z);
      line(x+10, y-10, z, x-10, y+10, z);

      // Draw line in 2D at same x value
      // Notice the parallax
      stroke(102);
      line(x, 0, 0, x, height, 0);

      // Draw 2D line to match the x value
      // element drawn at z = -100
      stroke(0);
      float theX = screenX(x, y, z);
      line(theX, 0, 0, theX, height, 0);
    }
Description | Takes a three-dimensional X, Y, Z position and returns the X value for where it will appear on a (two-dimensional) screen.
Syntax |
    screenX(x, y, z)
Parameters |
x | int or float: 3D x coordinate to be mapped
y | int or float: 3D y coordinate to be mapped
z | int or float: 3D z coordinate to be mapped
Returns | float
Usage | Web & Application
Related | screenY() screenZ()

Updated on August 30, 2010 04:29:39pm EDT