// Copyright 2009 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package com.google.appengine.demos.mandelbrot;
/**
* A {@code FractalSource} represents a fractal image of arbitrary
* size and resolution.
*
* @author schwardo@google.com (Don Schwarz)
*/
public interface FractalSource {
/**
* The left-most boundary of the fractal image.
*/
final double XMIN = -1.0;
/**
* The right-most boundary of the fractal image.
*/
final double XMAX = 1.0;
/**
* The bottom-most boundary of the fractal image.
*/
final double YMIN = -1.0;
/**
* The top-most boundary of the fractal image.
*/
final double YMAX = 1.0;
/**
* The horizontal size of the fractal image.
*/
final double XRANGE = XMAX - XMIN;
/**
* The vertical size of the fractal image.
*/
final double YRANGE = YMAX - YMIN;
/**
* Chooses a color for the specified point.
*
* @param x is a value between {@code XMIN} and {@code XMAX}
* @param y is a value between {@code YMIN} and {@code YMAX}
*
* @return an integer reresenting a color as produced by {@link ColorUtil}.
*/
int getValue(double x, double y);
}