sure i can blit them too, but i thought lines maybe handy for some cases
here is the code:
public void drawLine(int x1, int y1, int x2, int y2) {
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glPushMatrix();
GL11.glLoadIdentity();
int width = Display.getDisplayMode().getWidth();
int height = Display.getDisplayMode().getHeight();
GLU.gluOrtho2D(0, width, height, 0); //reverse y-coordinate
GL11.glTranslatef(dX, dY, 0f);
GL11.glDisable(GL11.GL_TEXTURE_2D);
GL11.glBegin(GL11.GL_LINE);
GL11.glVertex2f(x1, y1);
GL11.glVertex2f(x2, y2);
GL11.glEnd();
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glPopMatrix();
}