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1
51 package org.apache.fop.fo.expr;
52
53 import org.apache.fop.fo.Property;
54 import org.apache.fop.fo.ColorTypeProperty;
55 import org.apache.fop.datatypes.ColorType;
56 import org.apache.fop.datatypes.PercentBase;
57
58 class RGBColorFunction extends FunctionBase {
59 public int nbArgs() {
60 return 3;
61 }
62
63
68 public PercentBase getPercentBase() {
69 return new RGBPercentBase();
70 }
71
72 public Property eval(Property[] args,
73 PropertyInfo pInfo) throws PropertyException {
74 float[] cfvals = new float[3]; for (int i = 0; i < 3; i++) {
79 Number  cval = args[i].getNumber();
80 if (cval == null) {
81 throw new PropertyException("Argument to rgb() must be a Number");
82 }
83 float colorVal = cval.floatValue() / 255f;
84 if (colorVal < 0.0 || colorVal > 255.0) {
85 throw new PropertyException("Arguments to rgb() must normalize to the range 0 to 1");
86 }
87 cfvals[i] = colorVal;
88 }
89 return new ColorTypeProperty(new ColorType(cfvals[0], cfvals[1],
90 cfvals[2]));
91
92 }
93
94 static class RGBPercentBase implements PercentBase {
95 public int getDimension() {
96 return 0;
97 }
98
99 public double getBaseValue() {
100 return 255f;
101 }
102
103 public int getBaseLength() {
104 return 0;
105 }
106
107 }
108 }
109 |
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