protected java.awt.Color modulateColorOpacity(java.awt.Color color, double opacity) {
    float[] compArray = new float[4];
    color.getRGBComponents(compArray);
    compArray[3] *= (float) opacity;

    return new java.awt.Color(compArray[0], compArray[1], compArray[2], compArray[3]);
  }
  protected void applyColor(DrawContext dc, java.awt.Color color, double opacity) {
    if (dc.isPickingMode()) return;

    double finalOpacity = opacity * (color.getAlpha() / 255.0);
    GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
    OGLUtil.applyColor(gl, color, finalOpacity, true);
  }
  /**
   * getBorder.
   *
   * @param card a {@link forge.Card} object.
   * @return a {@link javax.swing.border.Border} object.
   */
  public static Border getBorder(Card card) {
    // color info
    if (card == null) return BorderFactory.createEmptyBorder(2, 2, 2, 2);
    java.awt.Color color;
    ArrayList<String> list = CardUtil.getColors(card);

    if (card.isFaceDown()) color = Color.gray;
    else if (list.size() > 1) color = Color.orange;
    else if (list.get(0).equals(Constant.Color.Black)) color = Color.black;
    else if (list.get(0).equals(Constant.Color.Green)) color = new Color(0, 220, 39);
    else if (list.get(0).equals(Constant.Color.White)) color = Color.white;
    else if (list.get(0).equals(Constant.Color.Red)) color = Color.red;
    else if (list.get(0).equals(Constant.Color.Blue)) color = Color.blue;
    else if (list.get(0).equals(Constant.Color.Colorless)) color = Color.gray;
    else color = new Color(200, 0, 230); // If your card has a violet border, something is wrong

    if (color != Color.gray) {

      int r = color.getRed();
      int g = color.getGreen();
      int b = color.getBlue();

      int shade = 10;

      r -= shade;
      g -= shade;
      b -= shade;

      r = Math.max(0, r);
      g = Math.max(0, g);
      b = Math.max(0, b);

      color = new Color(r, g, b);

      return BorderFactory.createLineBorder(color, 2);
    } else return BorderFactory.createLineBorder(Color.gray, 2);
  }
 public static java.awt.Color getContrastingColor(java.awt.Color color) {
   float[] hsbvals = new float[3];
   java.awt.Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), hsbvals);
   java.awt.Color c = Color.getHSBColor(0, 0, (hsbvals[2] + 0.5f) % 1f);
   return new java.awt.Color(c.getRed(), c.getGreen(), c.getBlue(), color.getAlpha());
 }
  protected void applyColor(DrawContext dc, java.awt.Color color, double opacity) {
    if (dc.isPickingMode()) return;

    double finalOpacity = opacity * (color.getAlpha() / 255.0);
    OGLUtil.applyColor(dc.getGL(), color, finalOpacity, true);
  }