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; }
16 public void fillTrapezoid(float x1, float x2, float y1, float x3, float x4, float y2, PixelBuffer buf) {
17 buf.fillTrapezoid((int)Math.round(x1), (int)Math.round(x2), (int)Math.round(y1),
18 (int)Math.round(x3), (int)Math.round(x4), (int)Math.round(y2), color);
23 public static class TexturePaint extends Paint {
26 public TexturePaint(Picture p, Affine a) { this.p = p; this.a = a.copy(); this.invert = a.copy().invert(); }
27 //public void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf) {
29 float x1 = invert.multiply_px(tx1, ty1);
30 float x2 = invert.multiply_px(tx2, ty1);
31 float x3 = invert.multiply_px(tx3, ty2);
32 float x4 = invert.multiply_px(tx4, ty2);
33 float y1 = invert.multiply_py(tx1, ty1);
34 float y2 = invert.multiply_py(tx3, ty2);
36 //buf.paintTrapezoid((int)tx1, (int)tx2, (int)ty1, (int)tx3, (int)tx4, (int)ty2, p, a);
40 public static abstract class GradientPaint extends Paint {
41 public GradientPaint(boolean reflect, boolean repeat, Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
42 this.reflect = reflect;
44 this.gradientTransform = gradientTransform;
45 this.stop_colors = stop_colors;
46 this.stop_offsets = stop_offsets;
49 Affine gradientTransform = Affine.identity();
50 boolean useBoundingBox = false; // FIXME not supported
51 boolean patternUseBoundingBox = false; // FIXME not supported
53 // it's invalid for both of these to be true
54 boolean reflect = false; // FIXME not supported
55 boolean repeat = false; // FIXME not supported
58 float cx, cy, r, fx, fy;
60 //public void fillTrapezoid(float tx1, float tx2, float ty1, float tx3, float tx4, float ty2, PixelBuffer buf) {
63 Affine inverse = a.copy().invert();
64 float slope1 = (tx3 - tx1) / (ty2 - ty1);
65 float slope2 = (tx4 - tx2) / (ty2 - ty1);
66 for(float y=ty1; y<ty2; y++) {
67 float _x1 = (y - ty1) * slope1 + tx1;
68 float _x2 = (y - ty1) * slope2 + tx2;
69 if (_x1 > _x2) { float _x0 = _x1; _x1 = _x2; _x2 = _x0; }
71 for(float x=_x1; x<_x2; x++) {
73 float distance = isLinear ?
74 // length of projection of <x,y> onto the gradient vector == {<x,y> \dot {grad \over |grad|}}
75 (x * (x2 - x1) + y * (y2 - y1)) / (float)Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)) :
77 // radial form is simple! FIXME, not quite right
78 (float)Math.sqrt((x - cx) * (x - cx) + (y - cy) * (y - cy));
80 // FIXME: offsets are 0..1, not 0..length(gradient)
81 int i = 0; for(; i<stop_offsets.length; i++) if (distance < stop_offsets[i]) break;
83 // FIXME: handle points beyond the bounds
84 if (i < 0 || i >= stop_offsets.length) continue;
86 // gradate from offsets[i - 1] to offsets[i]
87 float percentage = ((distance - stop_offsets[i - 1]) / (stop_offsets[i] - stop_offsets[i - 1]));
89 int a = (int)((((stop_colors[i] >> 24) & 0xff) - ((stop_colors[i - 1] >> 24) & 0xff)) * percentage) +
90 ((stop_colors[i - 1] >> 24) & 0xff);
91 int r = (int)((((stop_colors[i] >> 16) & 0xff) - ((stop_colors[i - 1] >> 16) & 0xff)) * percentage) +
92 ((stop_colors[i - 1] >> 16) & 0xff);
93 int g = (int)((((stop_colors[i] >> 8) & 0xff) - ((stop_colors[i - 1] >> 8) & 0xff)) * percentage) +
94 ((stop_colors[i - 1] >> 8) & 0xff);
95 int b = (int)((((stop_colors[i] >> 0) & 0xff) - ((stop_colors[i - 1] >> 0) & 0xff)) * percentage) +
96 ((stop_colors[i - 1] >> 0) & 0xff);
97 int argb = (a << 24) | (r << 16) | (g << 8) | b;
98 buf.drawPoint((int)x, (int)Math.floor(y), argb);
105 public static class LinearGradientPaint extends GradientPaint {
106 public LinearGradientPaint(float x1, float y1, float x2, float y2, boolean reflect, boolean repeat,
107 Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
108 super(reflect, repeat, gradientTransform, stop_colors, stop_offsets);
109 this.x1 = x1; this.x2 = x2; this.y1 = y1; this.y2 = y2;
111 float x1 = 0, y1 = 0, x2 = 300, y2 = 300;
114 public static class RadialGradientPaint extends GradientPaint {
115 public RadialGradientPaint(float cx, float cy, float fx, float fy, float r, boolean reflect, boolean repeat,
116 Affine gradientTransform, int[] stop_colors, float[] stop_offsets) {
117 super(reflect, repeat, gradientTransform, stop_colors, stop_offsets);
118 this.cx = cx; this.cy = cy; this.fx = fx; this.fy = fy; this.r = r;