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47 package com.lowagie.text.pdf;
48
49 import java.awt.Color  ;
50 import java.io.IOException ;
51
55 public class PdfShading {
56
57 protected PdfDictionary shading;
58
59 protected PdfWriter writer;
60
61 protected int shadingType;
62
63 protected ColorDetails colorDetails;
64
65 protected PdfName shadingName;
66
67 protected PdfIndirectReference shadingReference;
68
69 private Color cspace;
70
71
72 protected float[] bBox;
73
74
75 protected boolean antiAlias = false;
76
77
78 protected PdfShading(PdfWriter writer) {
79 this.writer = writer;
80 }
81
82 protected void setColorSpace(Color color) {
83 cspace = color;
84 int type = ExtendedColor.getType(color);
85 PdfObject colorSpace = null;
86 switch (type) {
87 case ExtendedColor.TYPE_GRAY: {
88 colorSpace = PdfName.DEVICEGRAY;
89 break;
90 }
91 case ExtendedColor.TYPE_CMYK: {
92 colorSpace = PdfName.DEVICECMYK;
93 break;
94 }
95 case ExtendedColor.TYPE_SEPARATION: {
96 SpotColor spot = (SpotColor)color;
97 colorDetails = writer.addSimple(spot.getPdfSpotColor());
98 colorSpace = colorDetails.getIndirectReference();
99 break;
100 }
101 case ExtendedColor.TYPE_PATTERN:
102 case ExtendedColor.TYPE_SHADING: {
103 throwColorSpaceError();
104 }
105 default:
106 colorSpace = PdfName.DEVICERGB;
107 break;
108 }
109 shading.put(PdfName.COLORSPACE, colorSpace);
110 }
111
112 public Color getColorSpace() {
113 return cspace;
114 }
115
116 public static void throwColorSpaceError() {
117 throw new IllegalArgumentException ("A tiling or shading pattern cannot be used as a color space in a shading pattern");
118 }
119
120 public static void checkCompatibleColors(Color c1, Color c2) {
121 int type1 = ExtendedColor.getType(c1);
122 int type2 = ExtendedColor.getType(c2);
123 if (type1 != type2)
124 throw new IllegalArgumentException ("Both colors must be of the same type.");
125 if (type1 == ExtendedColor.TYPE_SEPARATION && ((SpotColor)c1).getPdfSpotColor() != ((SpotColor)c2).getPdfSpotColor())
126 throw new IllegalArgumentException ("The spot color must be the same, only the tint can vary.");
127 if (type1 == ExtendedColor.TYPE_PATTERN || type1 == ExtendedColor.TYPE_SHADING)
128 throwColorSpaceError();
129 }
130
131 public static float[] getColorArray(Color color) {
132 int type = ExtendedColor.getType(color);
133 switch (type) {
134 case ExtendedColor.TYPE_GRAY: {
135 return new float[]{((GrayColor)color).getGray()};
136 }
137 case ExtendedColor.TYPE_CMYK: {
138 CMYKColor cmyk = (CMYKColor)color;
139 return new float[]{cmyk.getCyan(), cmyk.getMagenta(), cmyk.getYellow(), cmyk.getBlack()};
140 }
141 case ExtendedColor.TYPE_SEPARATION: {
142 return new float[]{((SpotColor)color).getTint()};
143 }
144 case ExtendedColor.TYPE_RGB: {
145 return new float[]{color.getRed() / 255f, color.getGreen() / 255f, color.getBlue() / 255f};
146 }
147 }
148 throwColorSpaceError();
149 return null;
150 }
151
152 public static PdfShading type1(PdfWriter writer, Color colorSpace, float domain[], float tMatrix[], PdfFunction function) {
153 PdfShading sp = new PdfShading(writer);
154 sp.shading = new PdfDictionary();
155 sp.shadingType = 1;
156 sp.shading.put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));
157 sp.setColorSpace(colorSpace);
158 if (domain != null)
159 sp.shading.put(PdfName.DOMAIN, new PdfArray(domain));
160 if (tMatrix != null)
161 sp.shading.put(PdfName.MATRIX, new PdfArray(tMatrix));
162 sp.shading.put(PdfName.FUNCTION, function.getReference());
163 return sp;
164 }
165
166 public static PdfShading type2(PdfWriter writer, Color colorSpace, float coords[], float domain[], PdfFunction function, boolean extend[]) {
167 PdfShading sp = new PdfShading(writer);
168 sp.shading = new PdfDictionary();
169 sp.shadingType = 2;
170 sp.shading.put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));
171 sp.setColorSpace(colorSpace);
172 sp.shading.put(PdfName.COORDS, new PdfArray(coords));
173 if (domain != null)
174 sp.shading.put(PdfName.DOMAIN, new PdfArray(domain));
175 sp.shading.put(PdfName.FUNCTION, function.getReference());
176 if (extend != null && (extend[0] || extend[1])) {
177 PdfArray array = new PdfArray(extend[0] ? PdfBoolean.PDFTRUE : PdfBoolean.PDFFALSE);
178 array.add(extend[1] ? PdfBoolean.PDFTRUE : PdfBoolean.PDFFALSE);
179 sp.shading.put(PdfName.EXTEND, array);
180 }
181 return sp;
182 }
183
184 public static PdfShading type3(PdfWriter writer, Color colorSpace, float coords[], float domain[], PdfFunction function, boolean extend[]) {
185 PdfShading sp = type2(writer, colorSpace, coords, domain, function, extend);
186 sp.shadingType = 3;
187 sp.shading.put(PdfName.SHADINGTYPE, new PdfNumber(sp.shadingType));
188 return sp;
189 }
190
191 public static PdfShading simpleAxial(PdfWriter writer, float x0, float y0, float x1, float y1, Color startColor, Color endColor, boolean extendStart, boolean extendEnd) {
192 checkCompatibleColors(startColor, endColor);
193 PdfFunction function = PdfFunction.type2(writer, new float[]{0, 1}, null, getColorArray(startColor),
194 getColorArray(endColor), 1);
195 return type2(writer, startColor, new float[]{x0, y0, x1, y1}, null, function, new boolean[]{extendStart, extendEnd});
196 }
197
198 public static PdfShading simpleAxial(PdfWriter writer, float x0, float y0, float x1, float y1, Color startColor, Color endColor) {
199 return simpleAxial(writer, x0, y0, x1, y1, startColor, endColor, true, true);
200 }
201
202 public static PdfShading simpleRadial(PdfWriter writer, float x0, float y0, float r0, float x1, float y1, float r1, Color startColor, Color endColor, boolean extendStart, boolean extendEnd) {
203 checkCompatibleColors(startColor, endColor);
204 PdfFunction function = PdfFunction.type2(writer, new float[]{0, 1}, null, getColorArray(startColor),
205 getColorArray(endColor), 1);
206 return type3(writer, startColor, new float[]{x0, y0, r0, x1, y1, r1}, null, function, new boolean[]{extendStart, extendEnd});
207 }
208
209 public static PdfShading simpleRadial(PdfWriter writer, float x0, float y0, float r0, float x1, float y1, float r1, Color startColor, Color endColor) {
210 return simpleRadial(writer, x0, y0, r0, x1, y1, r1, startColor, endColor, true, true);
211 }
212
213 PdfName getShadingName() {
214 return shadingName;
215 }
216
217 PdfIndirectReference getShadingReference() {
218 if (shadingReference == null)
219 shadingReference = writer.getPdfIndirectReference();
220 return shadingReference;
221 }
222
223 void setName(int number) {
224 shadingName = new PdfName("Sh" + number);
225 }
226
227 void addToBody() throws IOException {
228 if (bBox != null)
229 shading.put(PdfName.BBOX, new PdfArray(bBox));
230 if (antiAlias)
231 shading.put(PdfName.ANTIALIAS, PdfBoolean.PDFTRUE);
232 writer.addToBody(shading, getShadingReference());
233 }
234
235 PdfWriter getWriter() {
236 return writer;
237 }
238
239 ColorDetails getColorDetails() {
240 return colorDetails;
241 }
242
243 public float[] getBBox() {
244 return bBox;
245 }
246
247 public void setBBox(float[] bBox) {
248 if (bBox.length != 4)
249 throw new IllegalArgumentException ("BBox must be a 4 element array.");
250 this.bBox = bBox;
251 }
252
253 public boolean isAntiAlias() {
254 return antiAlias;
255 }
256
257 public void setAntiAlias(boolean antiAlias) {
258 this.antiAlias = antiAlias;
259 }
260
261 }
262 |
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