/** paint the portal using gl. */
public void paint(GL gl, GLDrawable glc) {
if (fill != null) {
setColor(gl, fill);
gl.glDisable(GL.GL_TEXTURE_2D);
}
gl.glLineWidth(lineWidth());
gl.glBegin(GL.GL_LINES); // draw each wall
for (int i = 0; i < pts2d.size(); i++) {
Point2D p = (Point2D) (pts2d.get(i));
gl.glVertex2d(p.x, p.y);
}
gl.glEnd();
if (pts2d.size() == 4) {
/* Connect mid point of the two line segments with dotted line*/
gl.glLineStipple(1, (short) 0x0F0F);
gl.glEnable(GL.GL_LINE_STIPPLE);
gl.glLineWidth(1);
gl.glBegin(GL.GL_LINES);
Point2D mid = pts2d.get(0).interp(pts2d.get(1), 0.5);
gl.glVertex2d(mid.x, mid.y);
mid = pts2d.get(2).interp(pts2d.get(3), 0.5);
gl.glVertex2d(mid.x, mid.y);
gl.glEnd();
gl.glDisable(GL.GL_LINE_STIPPLE);
}
}
private void renderOneside(Point2D a, Point2D b, GL gl, double d) {
gl.glClear(0);
Vector3D t = new Vector3D(b.x - a.x, 0, b.y - a.y);
Vector3D n = new Vector3D(0, 1, 0);
Vector3D cross = n.cross(t);
gl.glNormal3d(cross.x, cross.y, cross.z);
// Texture adjustment vars
double length =
scale * Math.sqrt((a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y)) / 100 + 0.1;
double height = scale;
// draw the 4 points of it
gl.glBegin(GL.GL_POLYGON);
gl.glTexCoord2d(0, 0);
gl.glVertex3d(a.x, d, a.y);
gl.glTexCoord2d(0, height);
gl.glVertex3d(a.x, d + 100, a.y);
gl.glTexCoord2d(length, height);
gl.glVertex3d(b.x, d + 100, b.y);
gl.glTexCoord2d(length, 0);
gl.glVertex3d(b.x, d, b.y);
gl.glEnd();
}