// Copyright 2000-2005 the Contributors, as shown in the revision logs.
// Licensed under the GNU General Public License version 2 ("the License").
// You may not use this file except in compliance with the License.

// FIXME
package org.ibex.graphics;
import java.util.*;

public abstract class Paint {
    //public abstract void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf);

    public static class SingleColorPaint extends Paint {
        public int color;
        public SingleColorPaint(int color) { this.color = color; }
        /*
        public void fillTrapezoid(float x1, float x2, float y1, float x3, float x4, float y2, PixelBuffer buf) {
            buf.fillTrapezoid((int)Math.round(x1), (int)Math.round(x2), (int)Math.round(y1),
                              (int)Math.round(x3), (int)Math.round(x4), (int)Math.round(y2), color);
        }
        */
    }

    public static class TexturePaint extends Paint {
        Affine a, invert;
        Picture p;
        public TexturePaint(Picture p, Affine a) { this.p = p; this.a = a.copy(); this.invert = a.copy().invert(); }
        //public void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf) {
            /*
            float x1 = invert.multiply_px(tx1, ty1);
            float x2 = invert.multiply_px(tx2, ty1);
            float x3 = invert.multiply_px(tx3, ty2);
            float x4 = invert.multiply_px(tx4, ty2);
            float y1 = invert.multiply_py(tx1, ty1);
            float y2 = invert.multiply_py(tx3, ty2);
            */
            //buf.paintTrapezoid((int)tx1, (int)tx2, (int)ty1, (int)tx3, (int)tx4, (int)ty2, p, a);
        //}
    }

    public static abstract class GradientPaint extends Paint {
        public GradientPaint(boolean reflect, boolean repeat, Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
            this.reflect = reflect;
            this.repeat = repeat;
            this.gradientTransform = gradientTransform;
            this.stop_colors = stop_colors;
            this.stop_offsets = stop_offsets;
        }

        Affine gradientTransform = Affine.identity();
        boolean useBoundingBox = false;               // FIXME not supported
        boolean patternUseBoundingBox = false;        // FIXME not supported
        
        // it's invalid for both of these to be true
        boolean reflect = false;                   // FIXME not supported
        boolean repeat = false;                    // FIXME not supported
        int[] stop_colors;
        float[] stop_offsets;
        float cx, cy, r, fx, fy;
        
        //public void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf) {
            /*
            Affine a = buf.a;
            Affine inverse = a.copy().invert();
            float slope1 = (tx3 - tx1) / (ty2 - ty1);
            float slope2 = (tx4 - tx2) / (ty2 - ty1);
            for(float y=ty1; y<ty2; y++) {
                float _x1 = (y - ty1) * slope1 + tx1;
                float _x2 = (y - ty1) * slope2 + tx2;
                if (_x1 > _x2) { float _x0 = _x1; _x1 = _x2; _x2 = _x0; }
                
                for(float x=_x1; x<_x2; x++) {
		    
                    float distance = isLinear ?
                        // length of projection of <x,y> onto the gradient vector == {<x,y> \dot {grad \over |grad|}}
                        (x * (x2 - x1) + y * (y2 - y1)) / (float)Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)) :
			
                        // radial form is simple! FIXME, not quite right
                        (float)Math.sqrt((x - cx) * (x - cx) + (y - cy) * (y - cy));
			
                    // FIXME: offsets are 0..1, not 0..length(gradient)
                    int i = 0; for(; i<stop_offsets.length; i++) if (distance < stop_offsets[i]) break;

                    // FIXME: handle points beyond the bounds
                    if (i < 0 || i >= stop_offsets.length) continue;

                    // gradate from offsets[i - 1] to offsets[i]
                    float percentage = ((distance - stop_offsets[i - 1]) / (stop_offsets[i] - stop_offsets[i - 1]));

                    int a = (int)((((stop_colors[i] >> 24) & 0xff) - ((stop_colors[i - 1] >> 24) & 0xff)) * percentage) +
                        ((stop_colors[i - 1] >> 24) & 0xff);
                    int r = (int)((((stop_colors[i] >> 16) & 0xff) - ((stop_colors[i - 1] >> 16) & 0xff)) * percentage) +
                        ((stop_colors[i - 1] >> 16) & 0xff);
                    int g = (int)((((stop_colors[i] >> 8) & 0xff)  - ((stop_colors[i - 1] >> 8) & 0xff)) * percentage) +
                        ((stop_colors[i - 1] >> 8) & 0xff);
                    int b = (int)((((stop_colors[i] >> 0) & 0xff)  - ((stop_colors[i - 1] >> 0) & 0xff)) * percentage) +
                        ((stop_colors[i - 1] >> 0) & 0xff);
                    int argb = (a << 24) | (r << 16) | (g << 8) | b;
                    buf.drawPoint((int)x, (int)Math.floor(y), argb);
                }
            }
            */
        //}
    }
    /*
    public static class LinearGradientPaint extends GradientPaint {
        public LinearGradientPaint(float x1, float y1, float x2, float y2, boolean reflect, boolean repeat,
                                   Affine gradientTransform,  int[] stop_colors, float[] stop_offsets) {
            super(reflect, repeat, gradientTransform, stop_colors, stop_offsets);
            this.x1 = x1; this.x2 = x2; this.y1 = y1; this.y2 = y2;
        }
        float x1 = 0, y1 = 0, x2 = 300, y2 = 300;
    }

    public static class RadialGradientPaint extends GradientPaint {
        public RadialGradientPaint(float cx, float cy, float fx, float fy, float r, boolean reflect, boolean repeat,
                                   Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
            super(reflect, repeat, gradientTransform, stop_colors, stop_offsets);
            this.cx = cx; this.cy = cy; this.fx = fx; this.fy = fy; this.r = r;
        }
            
    }
    */
}