Name

screenY()

Description

Takes a three-dimensional X, Y, Z position and returns the Y value for where it will appear on a (two-dimensional) screen.

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 gray line at z = 0 and same 
      // y value. Notice the parallax
      stroke(102);
      line(0, y, 0, width, y, 0);
      
      // Draw black line at z = 0 to match 
      // the y value element drawn at z = -100 
      stroke(0);
      float theY = screenY(x, y, z);
      line(0, theY, 0, width, theY, 0);    
    }  
    

Syntax

  • screenY(x, y)
  • screenY(x, y, z)

Parameters

  • x(float)3D x-coordinate to be mapped
  • y(float)3D y-coordinate to be mapped
  • z(float)3D z-coordinate to be mapped

Return

  • float