コード例 #1
0
 private void setUpDisplay() {
   try {
     Display.setDisplayMode(new DisplayMode(WIDTH, HEIGHT));
     Display.setTitle("Pong");
     Display.create();
   } catch (LWJGLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
   }
 }
コード例 #2
0
 private void endThisLoop() {
   // FPS meter
   if (time <= System.currentTimeMillis() - 1000) {
     Display.setTitle("Simulating gravity @ " + frameNumber + " FPS"); // Normal
     FPS = frameNumber;
     frameNumber = 0;
     time = System.currentTimeMillis();
   } else {
     frameNumber++;
   }
   Display.update();
   Display.sync(60);
 }
コード例 #3
0
  private void startDisplayLoop() {
    while (!Display.isCloseRequested()) {
      GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);

      checkInput();
      applyPhysics();

      drawStuff();

      endThisLoop();
    }
    endProgram();
    Display.destroy();
  }
コード例 #4
0
 public PongGame() {
   setUpDisplay();
   setUpOpengGL();
   setUpEntities();
   setUpTimer();
   while (isRunning) {
     render();
     logic(getDelta());
     input();
     Display.update();
     Display.sync(60);
     if (Display.isCloseRequested()) {
       isRunning = false;
     }
   }
   Display.destroy();
 }
コード例 #5
0
  private void initGL(int width, int height) {

    try {
      // DisplayMode mode = new DisplayMode(width,height);
      // DisplayMode mode = Display.getDesktopDisplayMode(); Old code, for not-fullscreen stuff
      Display.setDisplayMode(Display.getDesktopDisplayMode());
      Display.setFullscreen(true);
      Display.create();
      Display.setVSyncEnabled(true);
    } catch (LWJGLException e) {
      System.out.println("Catched an error in intiGL");
      e.printStackTrace();
      System.exit(0);
    }

    // init OpenGL
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glOrtho(0, width, 0, height, 1, -1);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);

    GL11.glEnable(GL11.GL_BLEND);
    GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
  }
コード例 #6
0
  public SimpleRenderer(int x, int y) {
    this.width = x;
    this.height = y;
    try {
      Display.setDisplayMode(new DisplayMode(x, y));
      Display.setTitle("Crowd Simulation");
      Display.create();
      Display.setVSyncEnabled(true);
    } catch (LWJGLException e) {
      e.printStackTrace();
    }

    Random r = new Random();

    System s = new System(this.width, this.height - 2, 0.0f, 1.0f);
    for (int i = 0; i < 1200; i++) {

      int xX = r.nextInt(this.width);
      int yY = r.nextInt(this.height);
      int oldX = xX; // + r.nextInt(1) ;
      int oldY = yY; // + r.nextInt(2) + 1;

      double size = r.nextGaussian() * 1.2 + 16;
      addPoint(
          s,
          xX,
          yY,
          oldX,
          oldY,
          (float) size, // r.nextFloat() * 20 + 10,
          1,
          i > 600 ? 0 : 1,
          1,
          i > 600 ? -0.9 : 0.9); // r.nextFloat(), r.nextFloat(), r.nextFloat());

      // addPoint(s, xX, yY, oldX, oldY, (float)size,//r.nextFloat() * 20 + 10,
      //		r.nextFloat(), r.nextFloat(), r.nextFloat(),i>400 ?-r.nextFloat():r.nextFloat());

    }

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, x, y, 0, 1, -1);
    glMatrixMode(GL_MODELVIEW);

    boolean isPressed = false;
    while (!Display.isCloseRequested()) // rendering
    {

      glClear(GL_COLOR_BUFFER_BIT);
      // glClearColor(1.0f,1.0f,1.0f,1.0f);
      if (Mouse.isButtonDown(0)) {

        // isPressed = true;
        /*int xX = Mouse.getX();
        int yY = this.height - Mouse.getY();

        int oldX = xX;// + r.nextInt(4) - 2;
        int oldY = yY;
        double size = r.nextGaussian()*1.2 +14;
        addPoint(s, xX, yY, oldX, oldY,(float)size,// r.nextFloat() * 20 + 10,
        		r.nextFloat(), r.nextFloat(), r.nextFloat(),30);
        */
        s.setDestroying(true);
      }

      if (Mouse.isButtonDown(1)) {

        for (int i = -150; i < 150; i += 10) {

          int xX = Mouse.getX();
          int yY = this.height - Mouse.getY();
          s.applyDirerction(s.searchPoint(xX, yY + i), 10);
        }
      }

      // java.lang.System.out.println("Number of objects: " +s.getListOfPoints().size() +"
      // Destroying? "+ s.isDestroying());
      s.step(3);

      int xX = Mouse.getX();
      int yY = this.height - Mouse.getY();

      for (int i = -150; i < 150; i += 10) {
        Point k = s.searchPoint(xX, yY + i);
        if (k != null) {
          glColor3f(0.0f, 0.0f, 0.0f);
          Point.DrawCircle(k.getX(), k.getY(), k.getRadius() - 2, 20);
        }
      }

      Display.update();
      Display.sync(30);
    }

    Display.destroy();
  }
コード例 #7
0
public class ScreenDisplay {

  final int screenWidth = Display.getDesktopDisplayMode().getWidth();
  final int screenHeight = Display.getDesktopDisplayMode().getHeight();
  final int maxAmountGravityObjects = 64;

  // Create objects
  VectorSlider vecSlider = new VectorSlider();

  // Create vars DON'T YET DEFINE VALUE
  int frameNumber;
  int FPS;
  int sizeSliderVal;
  int sizeSliderMultiplier;
  int slices;

  double gravConstant;
  double vecSliderMultiplier;

  boolean drawVector;

  long time;

  GravityObject[] gravityObjectArray = new GravityObject[maxAmountGravityObjects];
  final float[][] colorArray = new float[5][3];
  private int sizeSliderMultipier;
  // [0]=red
  // [1]=green
  // [2]=blue
  // [3]=white
  // [4]=black

  ScreenDisplay() { // CONSTRUCTOR
    initGL(screenWidth, screenHeight);
    load();
    startDisplayLoop();
  }

  private void initGL(int width, int height) {

    try {
      // DisplayMode mode = new DisplayMode(width,height);
      // DisplayMode mode = Display.getDesktopDisplayMode(); Old code, for not-fullscreen stuff
      Display.setDisplayMode(Display.getDesktopDisplayMode());
      Display.setFullscreen(true);
      Display.create();
      Display.setVSyncEnabled(true);
    } catch (LWJGLException e) {
      System.out.println("Catched an error in intiGL");
      e.printStackTrace();
      System.exit(0);
    }

    // init OpenGL
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glOrtho(0, width, 0, height, 1, -1);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);

    GL11.glEnable(GL11.GL_BLEND);
    GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
  }

  private void load() {
    frameNumber = 61;
    FPS = 0;
    sizeSliderVal = 10;
    sizeSliderMultiplier = 12;
    slices = 100;
    gravConstant = 0.1;
    vecSliderMultiplier = 0.15;
    drawVector = false;

    colorArray[0][0] = 1;
    colorArray[0][1] = 0;
    colorArray[0][2] = 0;

    colorArray[1][0] = 0.2f;
    colorArray[1][1] = 1;
    colorArray[1][2] = 0.2f;

    colorArray[2][0] = 0.3f;
    colorArray[2][1] = 0.3f;
    colorArray[2][2] = 1;

    colorArray[3][0] = 1;
    colorArray[3][1] = 1;
    colorArray[3][2] = 1;

    colorArray[4][0] = 0;
    colorArray[4][1] = 0;
    colorArray[4][2] = 0;

    /*loadTexture("tmpNaam", "TX_test.png");*/
  }

  private float[] randomColorArray() {
    float[] array = new float[3];

    array[0] = (float) Math.random();
    array[1] = (float) Math.random();
    array[2] = (float) Math.random();

    return array;
  }

  private void startDisplayLoop() {
    while (!Display.isCloseRequested()) {
      GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);

      checkInput();
      applyPhysics();

      drawStuff();

      endThisLoop();
    }
    endProgram();
    Display.destroy();
  }

  private void endProgram() {
    GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
    System.exit(0);
  }

  private void checkInput() {
    if (Mouse.isButtonDown(0)) {
      leftHold(Mouse.getX(), Mouse.getY());
    }
    while (Mouse.next()) {
      if (Mouse.getEventButtonState() && Mouse.getEventButton() == 0) {
        leftClick(Mouse.getX(), Mouse.getY());
      }

      if (Mouse.getEventButtonState() && Mouse.getEventButton() == 1) {
        rightClick();
      }
    }
    while (Keyboard.next()) {
      if (Keyboard.getEventKey() == Keyboard.KEY_ESCAPE) {
        System.exit(0);
      }

      if (Keyboard.getEventKey() == Keyboard.KEY_SPACE) {
        if (drawVector) {
          drawVector = false;
        } else {
          drawVector = true;
        }
      }
    }
    if (Keyboard.isKeyDown(Keyboard.KEY_UP)) {
      if (vecSlider.y < 85) {
        vecSlider.y++;
      }
    }
    if (Keyboard.isKeyDown(Keyboard.KEY_LEFT)) {
      if (vecSlider.x > -90) {
        vecSlider.x--;
      }
    }
    if (Keyboard.isKeyDown(Keyboard.KEY_DOWN)) {
      if (vecSlider.y > -85) {
        vecSlider.y--;
      }
    }
    if (Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) {
      if (vecSlider.x < 85) {
        vecSlider.x++;
      }
    }
  }

  private void leftHold(int x, int y) {
    if (y > 5 && y < 55 && x > 10 && x < screenWidth - 200) { // Within sizeSlider region
      sizeSliderVal = x / sizeSliderMultiplier;
      if (x > screenWidth - 250) {
        sizeSliderVal = (screenWidth - 250) / sizeSliderMultiplier;
      }
    } else if (y < 190
        && x > screenWidth - 190
        && y > 10
        && x < screenWidth - 10) { // Within vecSlider region
      vecSlider.x = x - (screenWidth - 100);
      vecSlider.y = y - 100;
    }
  }

  private void leftClick(int x, int y) {
    if ((y > 70 && x < screenWidth - 200) || (y > 210)) {
      drawCircle(x, y, sizeSliderVal + 4, colorArray[0]);
      createGravityObject(x, y);
    }
  }

  private void rightClick() {
    vecSlider.x = 0;
    vecSlider.y = 0;

    for (int i = 0; i < gravityObjectArray.length; i++) {
      gravityObjectArray[i] = null;
    }
  }

  private void applyPhysics() {
    GravityObject[] GOA = gravityObjectArray;

    for (int i = 0; i < GOA.length; i++) {
      int c = 0;

      if (GOA[i] != null) {

        double[] xVelAr = new double[128];
        double[] yVelAr = new double[128];

        for (int j = 0; j < GOA.length; j++) {
          if (GOA[j] != null) {
            if (GOA[j].size != 0 && GOA[i].size != 0) {
              if (i != j) {
                double distance =
                    Math.sqrt(
                        (Math.pow((GOA[j].xP - GOA[i].xP), 2))
                            + (Math.pow((GOA[j].yP - GOA[i].yP), 2)));
                double gravityForce =
                    gravConstant * (GOA[i].getMass() * GOA[j].getMass()) / Math.pow(distance, 2);
                // System.out.println("Gravitational force between "+i+" and "+ j+" is "+
                // gravityForce);

                double xDistance = GOA[j].xP - GOA[i].xP;
                if (xDistance < 0) {
                  xDistance = GOA[i].xP - GOA[j].xP;
                }
                double yDistance = GOA[j].yP - GOA[i].yP;
                if (yDistance < 0) {
                  yDistance = GOA[i].yP - GOA[j].yP;
                }
                // System.out.println("X, Y Distance: "+xDistance+" & "+yDistance);
                double acceleration = gravityForce / GOA[i].getMass();
                // System.out.println("Acceleration of object "+i+" is equal to "+acceleration);

                // System.out.println("Object "+i+" moved towards "+j+" with a speed of:
                // "+acceleration);
                xVelAr[c] = (acceleration / (xDistance + yDistance)) * (GOA[j].xP - GOA[i].xP);
                // System.out.println("xVelAr["+j+"] = ("+acceleration+" / ("+xDistance+" +
                // "+yDistance+")) * ("+GOA[j].xP+" - "+GOA[i].xP+") En dat is: "+ xVelAr[j]);
                yVelAr[c] = (acceleration / (xDistance + yDistance)) * (GOA[j].yP - GOA[i].yP);

                c++; // C, C# etc...
              }
            }
          } else {
            break;
          }
        }

        for (int k = 0; k < xVelAr.length; k++) {
          double xTotalVel = 0;
          if (xVelAr[k] != 0) {
            xTotalVel += xVelAr[k];
          } else {
            break;
          }
          GOA[i].xV += xTotalVel;
        }

        for (int l = 0; l < xVelAr.length; l++) {
          double yTotalVel = 0;
          if (yVelAr[l] != 0) {
            yTotalVel += yVelAr[l];
          } else {
            break;
          }
          GOA[i].yV += yTotalVel;
        }

        if (!collision(GOA[i])) {
          GOA[i].move();
        } else {
          GOA[i].move();
          // colliding is handled in collision()
        }

      } else {
        break;
      }
    }

    // Delete out of bounds spheres
    for (int i = 0; i < gravityObjectArray.length; i++) {
      if (gravityObjectArray[i] != null) {
        if (gravityObjectArray[i].xP > screenWidth
            || gravityObjectArray[i].xP < 0
            || gravityObjectArray[i].yP > screenHeight
            || gravityObjectArray[i].yP < 0) {
          gravityObjectArray[i].remove();
        }
      }
    }
  }

  private boolean collision(GravityObject GO) {
    for (int i = 0; i < gravityObjectArray.length; i++) {
      if (gravityObjectArray[i] != null) {
        if (GO != gravityObjectArray[i]) {
          double centerDistance =
              Math.sqrt(
                  (Math.pow((GO.xP - gravityObjectArray[i].xP), 2))
                      + (Math.pow((GO.yP - gravityObjectArray[i].yP), 2))); // <3 Pytagoras
          if (centerDistance < GO.size + gravityObjectArray[i].size) {

            if (GO.size > gravityObjectArray[i].size) {
              GO.eat(gravityObjectArray[i]);
            } else {
              gravityObjectArray[i].eat(GO);
            }
            if (GO.size < gravityObjectArray[i].size) {
              GO.remove();
            } else {
              gravityObjectArray[i].remove();
            }
            return true;
          }
        }
      } else {
        break;
      }
    }
    return false;
  }

  private void drawStuff() {
    drawVector();
    drawGlow();
    drawGhosts();
    drawGravityObject();

    /*drawQuad(300, 300, 110, 110, getTexture("tmpNaam")); // Textured stuff
    GL11.glColor3f(1, 1, 1);*/
    SimpleText.drawString(
        "Simulating gravity!"
            + "                   Try the arrow keys!                   Right mouse to clear                   Spacebar for vectors                   FPS: "
            + FPS
            + "                   Size: "
            + (sizeSliderVal + 1),
        5,
        65);

    drawSizeSlider();
    drawVecSlider();
  }

  private void endThisLoop() {
    // FPS meter
    if (time <= System.currentTimeMillis() - 1000) {
      Display.setTitle("Simulating gravity @ " + frameNumber + " FPS"); // Normal
      FPS = frameNumber;
      frameNumber = 0;
      time = System.currentTimeMillis();
    } else {
      frameNumber++;
    }
    Display.update();
    Display.sync(60);
  }

  private boolean gravityObjectCollision(int x, int y, int size) {
    for (int i = 0; i < gravityObjectArray.length; i++) {
      if (gravityObjectArray[i] != null) {

        double centerDistance =
            Math.sqrt(
                (Math.pow((x - gravityObjectArray[i].xP), 2))
                    + (Math.pow((y - gravityObjectArray[i].yP), 2))); // <3 Pytagoras

        if (centerDistance <= size + gravityObjectArray[i].size) {
          return true;
        }
      } else {
        break;
      }
    }

    return false;
  }

  private void drawSizeSlider() {
    drawQuad(0, 0, 60, screenWidth - 200, colorArray[3]);
    drawQuad(5, 5, 50, screenWidth - 210, colorArray[0]);
    drawCircle((sizeSliderVal * sizeSliderMultiplier) + 23, 30, 25, colorArray[2]);
  }

  private void createGravityObject(int x, int y) {
    int size = sizeSliderVal + 3;
    float[] color = randomColorArray();

    if (!gravityObjectCollision(x, y, size)) {
      for (int i = 0; i < gravityObjectArray.length - 1; i++) {
        if (gravityObjectArray[i] == null || gravityObjectArray[i].size == 0) {
          System.out.println(
              "Created a gravityObject NR: " + i + " Coords: (" + x + ", " + y + ") size: " + size);
          gravityObjectArray[i] = new GravityObject(x, y, size, color);
          gravityObjectArray[i].xV = vecSlider.x * vecSliderMultiplier;
          gravityObjectArray[i].yV = vecSlider.y * vecSliderMultiplier;
          gravityObjectArray[i].force = vecSlider.getDistance();
          break;
        }
      }
    }
  }

  private void drawVecSlider() {
    drawQuad(screenWidth - 205, 0, 200, 205, colorArray[3]);
    drawQuad(screenWidth - 200, 5, 190, 195, colorArray[0]);

    drawQuad(screenWidth - 101, 70, 60, 2, colorArray[4]);
    drawQuad(screenWidth - 130, 99, 2, 60, colorArray[4]);

    GL11.glTranslatef(screenWidth - 100, 100, 0);

    drawCircle(vecSlider.x, vecSlider.y, 11, colorArray[2]);

    GL11.glLoadIdentity();

    // drawCircle((sizeSliderVal*7) + 23, 30, 25, colorArray[2]);
  }

  private void drawGravityObject() {
    for (int i = 0; i < gravityObjectArray.length; i++) {
      if (gravityObjectArray[i] != null) {
        drawCircle(
            gravityObjectArray[i].xP,
            gravityObjectArray[i].yP,
            gravityObjectArray[i].size,
            gravityObjectArray[i].color);
      } else {
        break;
      }
    }
  }

  private void drawGhosts() {
    for (int i = 0; i < gravityObjectArray.length; i++) {
      if (gravityObjectArray[i] != null) {
        for (int j = 0; j < 30; j++) {

          drawCircle(
              gravityObjectArray[i].xGhosts[j],
              gravityObjectArray[i].yGhosts[j],
              gravityObjectArray[i].size,
              gravityObjectArray[i].color,
              (float) (0.7 / (j + 0.1)));
          // System.out.println("Draw a ghost: ("+gravityObjectArray[i].ghostsX[j]+",
          // "+gravityObjectArray[i].ghostsY[j]+")");
        }

      } else {
        break;
      }
    }
  }

  private void drawVector() {
    if (drawVector) {
      for (int i = 0; i < gravityObjectArray.length; i++) {
        if (gravityObjectArray[i] != null) {
          GravityObject[] GOA = gravityObjectArray;
          GravityObject GO = gravityObjectArray[i];

          for (int j = 0; j < GOA.length; j++) {
            if (GOA[j] != null
                && GOA[j].xP > 0
                && GOA[j].yP > 0
                && GOA[i].xP > 0
                && GOA[i].yP > 0) {
              double distance =
                  Math.sqrt(
                      (Math.pow((GOA[j].xP - GOA[i].xP), 2))
                          + (Math.pow((GOA[j].yP - GOA[i].yP), 2)));
              double gravityForce =
                  gravConstant * (GOA[i].getMass() * GOA[j].getMass()) / Math.pow(distance, 2);

              float[] gColAr = new float[3];
              gColAr[0] = (float) (gravityForce * 1.3);
              gColAr[1] = (float) (gravityForce * 1);
              gColAr[2] = (float) (gravityForce * 1);
              drawLine(
                  (int) (GOA[i].xP),
                  (int) (GOA[i].yP),
                  (int) (GOA[j].xP),
                  (int) (GOA[j].yP),
                  gColAr);
            }
          }
          float[] sColAr = new float[3];
          sColAr[0] = (float) (0.2);
          sColAr[1] = (float) (0.2);
          sColAr[2] = (float) (0);
          drawLine(
              ((int) GO.xP),
              ((int) GO.yP),
              ((int) (GO.xP + GO.xV * (25))),
              ((int) (GO.yP + GO.yV * (25))),
              sColAr);
        }
      }
    }
  }

  private void drawGlow() {
    for (int i = 0; i < gravityObjectArray.length; i++) {
      if (gravityObjectArray[i] != null) {

        float[] tmpColor = gravityObjectArray[i].color;
        drawCircle(
            gravityObjectArray[i].xP,
            gravityObjectArray[i].yP,
            gravityObjectArray[i].size + 1,
            tmpColor,
            0.5f);
        drawCircle(
            gravityObjectArray[i].xP,
            gravityObjectArray[i].yP,
            gravityObjectArray[i].size + 2,
            tmpColor,
            0.4f);
        drawCircle(
            gravityObjectArray[i].xP,
            gravityObjectArray[i].yP,
            gravityObjectArray[i].size + 3,
            tmpColor,
            0.3f);
        drawCircle(
            gravityObjectArray[i].xP,
            gravityObjectArray[i].yP,
            gravityObjectArray[i].size + 5,
            tmpColor,
            0.2f);
        drawCircle(
            gravityObjectArray[i].xP,
            gravityObjectArray[i].yP,
            gravityObjectArray[i].size + 7,
            tmpColor,
            0.1f);
      } else {
        break;
      }
    }
  }

  private void drawLine(int X1, int Y1, int X2, int Y2, float color[]) {
    GL11.glColor3f(color[0], color[1], color[2]);

    GL11.glBegin(GL11.GL_LINES);
    GL11.glVertex2f(X1, Y1);
    GL11.glVertex2f(X2, Y2);
    GL11.glEnd();
  }

  private void drawQuad(int x, int y, int h, int w, float color[]) {
    GL11.glColor3f(color[0], color[1], color[2]);

    // draw quad
    GL11.glBegin(GL11.GL_QUADS);
    GL11.glVertex2f(x, y);
    GL11.glVertex2f(x + w, y);
    GL11.glVertex2f(x + w, y + h);
    GL11.glVertex2f(x, y + h);
    GL11.glEnd();
  }

  private void drawQuad(int x, int y, int h, int w, float color[], float alpha) {
    GL11.glColor4f(color[0], color[1], color[2], alpha);

    // draw quad
    GL11.glBegin(GL11.GL_QUADS);
    GL11.glVertex2f(x, y);
    GL11.glVertex2f(x + w, y);
    GL11.glVertex2f(x + w, y + h);
    GL11.glVertex2f(x, y + h);
    GL11.glEnd();
  }

  private void drawCircle(double x, double y, int radius, float color[]) {
    GL11.glColor3f(color[0], color[1], color[2]);

    float incr = (float) (2 * Math.PI / slices);
    /*xCoord = xCoord + radius;
    yCoord = yCoord + radius;*/

    GL11.glBegin(GL11.GL_TRIANGLE_FAN);
    for (int i = 0; i < slices; i++) {
      float angle = incr * i;

      float Xc = (float) (x + Math.cos(angle) * radius);
      float Yc = (float) (y + Math.sin(angle) * radius);

      GL11.glVertex2f(Xc, Yc);
    }
    GL11.glEnd();
  }

  private void drawCircle(double x, double y, int radius, float color[], float alpha) {
    GL11.glColor4f(color[0], color[1], color[2], alpha);

    float incr = (float) (2 * Math.PI / slices);
    /*xCoord = xCoord + radius;
    yCoord = yCoord + radius;*/

    GL11.glBegin(GL11.GL_TRIANGLE_FAN);
    for (int i = 0; i < slices; i++) {
      float angle = incr * i;

      float Xc = (float) (x + Math.cos(angle) * radius);
      float Yc = (float) (y + Math.sin(angle) * radius);

      GL11.glVertex2f(Xc, Yc);
    }
    GL11.glEnd();
  }
}