public static AffineTransform getTransform(String str) throws IOException {
AffineTransform t = new AffineTransform();
if (str != null) {
StreamTokenizer tt = new StreamTokenizer(new StringReader(str));
tt.resetSyntax();
tt.wordChars('a', 'z');
tt.wordChars('A', 'Z');
tt.wordChars(128 + 32, 255);
tt.whitespaceChars(0, ' ');
tt.whitespaceChars(',', ',');
tt.parseNumbers();
while (tt.nextToken() != StreamTokenizer.TT_EOF) {
if (tt.ttype != StreamTokenizer.TT_WORD) {
throw new IOException("Illegal transform " + str);
}
String type = tt.sval;
if (tt.nextToken() != '(') {
throw new IOException("'(' not found in transform " + str);
}
if (type.equals("matrix")) {
double[] m = new double[6];
for (int i = 0; i < 6; i++) {
if (tt.nextToken() != StreamTokenizer.TT_NUMBER) {
throw new IOException(
"Matrix value "
+ i
+ " not found in transform "
+ str
+ " token:"
+ tt.ttype
+ " "
+ tt.sval);
}
if (tt.nextToken() == StreamTokenizer.TT_WORD && tt.sval.startsWith("E")) {
double mantissa = tt.nval;
tt.nval = Double.valueOf(tt.nval + tt.sval);
} else {
tt.pushBack();
}
m[i] = tt.nval;
}
t.concatenate(new AffineTransform(m));
} else if (type.equals("translate")) {
double tx, ty;
if (tt.nextToken() != StreamTokenizer.TT_NUMBER) {
throw new IOException("X-translation value not found in transform " + str);
}
tx = tt.nval;
if (tt.nextToken() == StreamTokenizer.TT_NUMBER) {
ty = tt.nval;
} else {
tt.pushBack();
ty = 0;
}
t.translate(tx, ty);
} else if (type.equals("scale")) {
double sx, sy;
if (tt.nextToken() != StreamTokenizer.TT_NUMBER) {
throw new IOException("X-scale value not found in transform " + str);
}
sx = tt.nval;
if (tt.nextToken() == StreamTokenizer.TT_NUMBER) {
sy = tt.nval;
} else {
tt.pushBack();
sy = sx;
}
t.scale(sx, sy);
} else if (type.equals("rotate")) {
double angle, cx, cy;
if (tt.nextToken() != StreamTokenizer.TT_NUMBER) {
throw new IOException("Angle value not found in transform " + str);
}
angle = tt.nval;
if (tt.nextToken() == StreamTokenizer.TT_NUMBER) {
cx = tt.nval;
if (tt.nextToken() != StreamTokenizer.TT_NUMBER) {
throw new IOException("Y-center value not found in transform " + str);
}
cy = tt.nval;
} else {
tt.pushBack();
cx = cy = 0;
}
t.rotate(angle * Math.PI / 180d, cx * Math.PI / 180d, cy * Math.PI / 180d);
} else if (type.equals("skewX")) {
double angle;
if (tt.nextToken() != StreamTokenizer.TT_NUMBER) {
throw new IOException("Skew angle not found in transform " + str);
}
angle = tt.nval;
t.concatenate(new AffineTransform(1, 0, Math.tan(angle * Math.PI / 180), 1, 0, 0));
} else if (type.equals("skewY")) {
double angle;
if (tt.nextToken() != StreamTokenizer.TT_NUMBER) {
throw new IOException("Skew angle not found in transform " + str);
}
angle = tt.nval;
t.concatenate(new AffineTransform(1, Math.tan(angle * Math.PI / 180), 0, 1, 0, 0));
} else {
throw new IOException("Unknown transform " + type + " in " + str);
}
if (tt.nextToken() != ')') {
throw new IOException("')' not found in transform " + str);
}
}
}
return t;
}
