1 // Copyright 2000-2005 the Contributors, as shown in the revision logs.
2 // Licensed under the GNU General Public License version 2 ("the License").
3 // You may not use this file except in compliance with the License.
6 package org.ibex.graphics;
9 public abstract class Paint {
10 public abstract void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf);
12 public static class SingleColorPaint extends Paint {
14 public SingleColorPaint(int color) { this.color = color; }
15 public void fillTrapezoid(float x1, float x2, float y1, float x3, float x4, float y2, PixelBuffer buf) {
16 buf.fillTrapezoid((int)Math.round(x1), (int)Math.round(x2), (int)Math.round(y1),
17 (int)Math.round(x3), (int)Math.round(x4), (int)Math.round(y2), color);
21 public static class TexturePaint extends Paint {
24 public TexturePaint(Picture p, Affine a) { this.p = p; this.a = a.copy(); this.invert = a.copy().invert(); }
25 public void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf) {
27 float x1 = invert.multiply_px(tx1, ty1);
28 float x2 = invert.multiply_px(tx2, ty1);
29 float x3 = invert.multiply_px(tx3, ty2);
30 float x4 = invert.multiply_px(tx4, ty2);
31 float y1 = invert.multiply_py(tx1, ty1);
32 float y2 = invert.multiply_py(tx3, ty2);
34 //buf.paintTrapezoid((int)tx1, (int)tx2, (int)ty1, (int)tx3, (int)tx4, (int)ty2, p, a);
38 public static abstract class GradientPaint extends Paint {
39 public GradientPaint(boolean reflect, boolean repeat, Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
40 this.reflect = reflect;
42 this.gradientTransform = gradientTransform;
43 this.stop_colors = stop_colors;
44 this.stop_offsets = stop_offsets;
47 Affine gradientTransform = Affine.identity();
48 boolean useBoundingBox = false; // FIXME not supported
49 boolean patternUseBoundingBox = false; // FIXME not supported
51 // it's invalid for both of these to be true
52 boolean reflect = false; // FIXME not supported
53 boolean repeat = false; // FIXME not supported
56 float cx, cy, r, fx, fy;
58 public void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf) {
61 Affine inverse = a.copy().invert();
62 float slope1 = (tx3 - tx1) / (ty2 - ty1);
63 float slope2 = (tx4 - tx2) / (ty2 - ty1);
64 for(float y=ty1; y<ty2; y++) {
65 float _x1 = (y - ty1) * slope1 + tx1;
66 float _x2 = (y - ty1) * slope2 + tx2;
67 if (_x1 > _x2) { float _x0 = _x1; _x1 = _x2; _x2 = _x0; }
69 for(float x=_x1; x<_x2; x++) {
71 float distance = isLinear ?
72 // length of projection of <x,y> onto the gradient vector == {<x,y> \dot {grad \over |grad|}}
73 (x * (x2 - x1) + y * (y2 - y1)) / (float)Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)) :
75 // radial form is simple! FIXME, not quite right
76 (float)Math.sqrt((x - cx) * (x - cx) + (y - cy) * (y - cy));
78 // FIXME: offsets are 0..1, not 0..length(gradient)
79 int i = 0; for(; i<stop_offsets.length; i++) if (distance < stop_offsets[i]) break;
81 // FIXME: handle points beyond the bounds
82 if (i < 0 || i >= stop_offsets.length) continue;
84 // gradate from offsets[i - 1] to offsets[i]
85 float percentage = ((distance - stop_offsets[i - 1]) / (stop_offsets[i] - stop_offsets[i - 1]));
87 int a = (int)((((stop_colors[i] >> 24) & 0xff) - ((stop_colors[i - 1] >> 24) & 0xff)) * percentage) +
88 ((stop_colors[i - 1] >> 24) & 0xff);
89 int r = (int)((((stop_colors[i] >> 16) & 0xff) - ((stop_colors[i - 1] >> 16) & 0xff)) * percentage) +
90 ((stop_colors[i - 1] >> 16) & 0xff);
91 int g = (int)((((stop_colors[i] >> 8) & 0xff) - ((stop_colors[i - 1] >> 8) & 0xff)) * percentage) +
92 ((stop_colors[i - 1] >> 8) & 0xff);
93 int b = (int)((((stop_colors[i] >> 0) & 0xff) - ((stop_colors[i - 1] >> 0) & 0xff)) * percentage) +
94 ((stop_colors[i - 1] >> 0) & 0xff);
95 int argb = (a << 24) | (r << 16) | (g << 8) | b;
96 buf.drawPoint((int)x, (int)Math.floor(y), argb);
103 public static class LinearGradientPaint extends GradientPaint {
104 public LinearGradientPaint(float x1, float y1, float x2, float y2, boolean reflect, boolean repeat,
105 Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
106 super(reflect, repeat, gradientTransform, stop_colors, stop_offsets);
107 this.x1 = x1; this.x2 = x2; this.y1 = y1; this.y2 = y2;
109 float x1 = 0, y1 = 0, x2 = 300, y2 = 300;
112 public static class RadialGradientPaint extends GradientPaint {
113 public RadialGradientPaint(float cx, float cy, float fx, float fy, float r, boolean reflect, boolean repeat,
114 Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
115 super(reflect, repeat, gradientTransform, stop_colors, stop_offsets);
116 this.cx = cx; this.cy = cy; this.fx = fx; this.fy = fy; this.r = r;