/*
Copyright 2006 Jerry Huxtable

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 org.meteoinfo.image.filter;

import org.meteoinfo.image.math.Function2D;
import org.meteoinfo.image.math.Noise;

public class TextureFilter extends PointFilter {

    private float scale = 32;
    private float stretch = 1.0f;
    private float angle = 0.0f;
    public float amount = 1.0f;
    public float turbulence = 1.0f;
    public float gain = 0.5f;
    public float bias = 0.5f;
    public int operation;
    private float m00 = 1.0f;
    private float m01 = 0.0f;
    private float m10 = 0.0f;
    private float m11 = 1.0f;
    private Colormap colormap = new Gradient();
    private Function2D function = new Noise();

    public TextureFilter() {
    }

    /**
     * Set the amount of texture.
     *
     * @param amount the amount min-value 0 max-value 1
     * @see #getAmount
     */
    public void setAmount(float amount) {
        this.amount = amount;
    }

    /**
     * Get the amount of texture.
     *
     * @return the amount
     * @see #setAmount
     */
    public float getAmount() {
        return amount;
    }

    public void setFunction(Function2D function) {
        this.function = function;
    }

    public Function2D getFunction() {
        return function;
    }

    public void setOperation(int operation) {
        this.operation = operation;
    }

    public int getOperation() {
        return operation;
    }

    /**
     * Specifies the scale of the texture.
     *
     * @param scale the scale of the texture. min-value 1 max-value 300+
     * @see #getScale
     */
    public void setScale(float scale) {
        this.scale = scale;
    }

    /**
     * Returns the scale of the texture.
     *
     * @return the scale of the texture.
     * @see #setScale
     */
    public float getScale() {
        return scale;
    }

    /**
     * Specifies the stretch factor of the texture.
     *
     * @param stretch the stretch factor of the texture. min-value 1 max-value
     * 50+
     * @see #getStretch
     */
    public void setStretch(float stretch) {
        this.stretch = stretch;
    }

    /**
     * Returns the stretch factor of the texture.
     *
     * @return the stretch factor of the texture.
     * @see #setStretch
     */
    public float getStretch() {
        return stretch;
    }

    /**
     * Specifies the angle of the texture.
     *
     * @param angle the angle of the texture.
     *
     * @see #getAngle
     */
    public void setAngle(float angle) {
        this.angle = angle;
        float cos = (float) Math.cos(angle);
        float sin = (float) Math.sin(angle);
        m00 = cos;
        m01 = sin;
        m10 = -sin;
        m11 = cos;
    }

    /**
     * Returns the angle of the texture.
     *
     * @return the angle of the texture.
     * @see #setAngle
     */
    public float getAngle() {
        return angle;
    }

    /**
     * Specifies the turbulence of the texture.
     *
     * @param turbulence the turbulence of the texture. min-value 0 max-value 1
     * @see #getTurbulence
     */
    public void setTurbulence(float turbulence) {
        this.turbulence = turbulence;
    }

    /**
     * Returns the turbulence of the texture.
     *
     * @return the turbulence of the texture.
     * @see #setTurbulence
     */
    public float getTurbulence() {
        return turbulence;
    }

    /**
     * Set the colormap to be used for the filter.
     *
     * @param colormap the colormap
     * @see #getColormap
     */
    public void setColormap(Colormap colormap) {
        this.colormap = colormap;
    }

    /**
     * Get the colormap to be used for the filter.
     *
     * @return the colormap
     * @see #setColormap
     */
    public Colormap getColormap() {
        return colormap;
    }

    public int filterRGB(int x, int y, int rgb) {
        float nx = m00 * x + m01 * y;
        float ny = m10 * x + m11 * y;
        nx /= scale;
        ny /= scale * stretch;
        float f = turbulence == 1.0 ? Noise.noise2(nx, ny) : Noise.turbulence2(nx, ny, turbulence);
        f = (f * 0.5f) + 0.5f;
        f = ImageMath.gain(f, gain);
        f = ImageMath.bias(f, bias);
        f *= amount;
        int a = rgb & 0xff000000;
        int v;
        if (colormap != null) {
            v = colormap.getColor(f);
        } else {
            v = PixelUtils.clamp((int) (f * 255));
            int r = v << 16;
            int g = v << 8;
            int b = v;
            v = a | r | g | b;
        }
        if (operation != PixelUtils.REPLACE) {
            v = PixelUtils.combinePixels(rgb, v, operation);
        }
        return v;
    }

    public String toString() {
        return "Texture/Noise...";
    }

}
