Package org.lazywizard.lazylib.opengl

Class DrawUtils

Object
DrawUtils
public class DrawUtils extends Object
Contains methods to draw simple 2D shapes using OpenGL primitives. These methods only contain the actual drawing code and assumes all OpenGL flags, color, line width etc have been set by the user beforehand.
Since:
1.7
Author:
LazyWizard

  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    drawArc(float centerX, float centerY, float radius, float startAngle, float arcAngle, int numSegments, boolean drawFilled)
    Draws an arc made up of line segments.
    static void
    drawCircle(float centerX, float centerY, float radius, int numSegments, boolean drawFilled)
    Draws a simple circle made of line segments, or a filled circle if drawFilled is true.
    static void
    drawEllipse(float centerX, float centerY, float width, float height, float angleOffset, int numSegments, boolean drawFilled)
    Draws an elliptical shape made of line segments, or a filled ellipse if drawFilled is true.

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • drawCircle

      public static void drawCircle(float centerX, float centerY, float radius, int numSegments, boolean drawFilled)
      Draws a simple circle made of line segments, or a filled circle if drawFilled is true.

      This method only contains the actual drawing code and assumes all OpenGL flags, color, line width etc have been set by the user beforehand.

      Optimized circle-drawing algorithm based on code taken from: http://slabode.exofire.net/circle_draw.shtml

      Parameters:
      centerX - The x value of the center point of the circle.
      centerY - The y value of the center point of the circle.
      radius - The radius of the circle to be drawn.
      numSegments - How many line segments the circle should be made up of (higher number = smoother circle, but higher GPU cost).
      drawFilled - Whether the circle should be hollow or filled.
      Since:
      1.7

    • drawEllipse

      public static void drawEllipse(float centerX, float centerY, float width, float height, float angleOffset, int numSegments, boolean drawFilled)
      Draws an elliptical shape made of line segments, or a filled ellipse if drawFilled is true.

      This method only contains the actual drawing code and assumes all OpenGL flags, color, line width etc have been set by the user beforehand.

      Optimized circle-drawing algorithm based on code taken from: http://slabode.exofire.net/circle_draw.shtml

      Parameters:
      centerX - The x value of the center point of the circle.
      centerY - The y value of the center point of the circle.
      width - The width (size on unrotated x-axis) of the ellipse.
      height - The height (size on unrotated y-axis) of the ellipse.
      angleOffset - How much to rotate the ellipse from its original axis, in degrees.
      numSegments - How many line segments the ellipse should be made up of (higher number = smoother ellipse, but higher GPU cost).
      drawFilled - Whether the ellipse should be hollow or filled.
      Since:
      1.9

    • drawArc

      public static void drawArc(float centerX, float centerY, float radius, float startAngle, float arcAngle, int numSegments, boolean drawFilled)
      Draws an arc made up of line segments.

      This method only contains the actual drawing code and assumes all OpenGL flags, color, line width etc have been set by the user beforehand.

      Optimized arc-drawing algorithm based on code taken from: http://slabode.exofire.net/circle_draw.shtml

      Parameters:
      centerX - The x value of the center point of the arc.
      centerY - The y value of the center point of the arc.
      radius - The radius of the arc to be drawn.
      startAngle - The angle the arc should start at, in degrees.
      arcAngle - The size of the arc, in degrees.
      numSegments - How many line segments the arc should be made up of (higher number = smoother arc, but higher GPU cost).
      drawFilled - Whether to draw the arc filled.
      Since:
      1.8