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Nifty Renderer for Slick2D
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package de.lessvoid.nifty.slick2d.render;

import org.newdawn.slick.Color;
import org.newdawn.slick.ShapeFill;
import org.newdawn.slick.geom.Shape;
import org.newdawn.slick.geom.Vector2f;

import javax.annotation.Nonnull;

/**
 * This shape fill implementation is used to render the rectangles of slick that that have a different color on each
 * edge. This implementation is not supposed to be used for any other purpose.
 *
 * @author Martin Karing <[email protected]>
 */
final class SlickQuadFill implements ShapeFill {
  /**
   * This is the vector that is returned as offset at all times.
   */
  private static final Vector2f NULL_VECTOR = new Vector2f(0, 0);

  /**
   * The color on the bottom left corner of the shape.
   */
  @Nonnull
  private final Color bottomLeft;

  /**
   * The color on the bottom right corner of the shape.
   */
  @Nonnull
  private final Color bottomRight;

  /**
   * The color on the top left corner of the shape.
   */
  @Nonnull
  private final Color topLeft;

  /**
   * The color on the top right corner of the shape.
   */
  @Nonnull
  private final Color topRight;

  /**
   * Create a new rectangle filling instance.
   *
   * @param tlColor the color at the top left
   * @param trColor the color at the top right
   * @param blColor the color at the bottom left
   * @param brColor the color at the bottom right
   */
  SlickQuadFill(
      @Nonnull final de.lessvoid.nifty.tools.Color tlColor,
      @Nonnull final de.lessvoid.nifty.tools.Color trColor,
      @Nonnull final de.lessvoid.nifty.tools.Color blColor,
      @Nonnull final de.lessvoid.nifty.tools.Color brColor) {

    topLeft = SlickRenderUtils.convertColorNiftySlick(tlColor);
    topRight = SlickRenderUtils.convertColorNiftySlick(trColor);
    bottomLeft = SlickRenderUtils.convertColorNiftySlick(blColor);
    bottomRight = SlickRenderUtils.convertColorNiftySlick(brColor);
  }

  /**
   * Change all the color values.
   *
   * @param tlColor the color at the top left
   * @param trColor the color at the top right
   * @param blColor the color at the bottom left
   * @param brColor the color at the bottom right
   */
  public void changeColors(
      @Nonnull final de.lessvoid.nifty.tools.Color tlColor,
      @Nonnull final de.lessvoid.nifty.tools.Color trColor,
      @Nonnull final de.lessvoid.nifty.tools.Color blColor,
      @Nonnull final de.lessvoid.nifty.tools.Color brColor) {

    SlickRenderUtils.convertColorNiftySlick(tlColor, topLeft);
    SlickRenderUtils.convertColorNiftySlick(trColor, topRight);
    SlickRenderUtils.convertColorNiftySlick(blColor, bottomLeft);
    SlickRenderUtils.convertColorNiftySlick(brColor, bottomRight);
  }

  /**
   * Get the color at one point on the shape.
   */
  @Nonnull
  @Override
  public Color colorAt(@Nonnull final Shape shape, final float x, final float y) {
    final boolean isMaxX = Math.abs(x - shape.getMaxX()) < 0.0f;
    final boolean isMaxY = Math.abs(y - shape.getMaxY()) < 0.0f;

    if (isMaxX) {
      return isMaxY ? topRight : topLeft;
    } else {
      return isMaxY ? bottomRight : bottomLeft;
    }
  }

  /**
   * Get the offset at a location.
   */
  @Nonnull
  @Override
  public Vector2f getOffsetAt(final Shape shape, final float x, final float y) {
    return NULL_VECTOR;
  }

}