float startOffset,
float textLength,
int lengthAdjustMode) {
GeneralPath newPath = new GeneralPath();
PathLength pl = new PathLength(path);
float pathLength = pl.lengthOfPath();
float glyphsLength = (float) glyphs.getVisualBounds().getWidth();
// return from the ugly cases
if (path == null ||
glyphs == null ||
glyphs.getNumGlyphs() == 0 ||
pl.lengthOfPath() == 0f ||
glyphsLength == 0f) {
return newPath;
}
// work out the expansion/contraction per character
float lengthRatio = textLength / glyphsLength;
// the current start point of the character on the path
float currentPosition = startOffset;
// if align is START then a currentPosition of 0f
// is correct.
// if align is END then the currentPosition should
// be enough to place the last character on the end
// of the path
// if align is MIDDLE then the currentPosition should
// be enough to center the glyphs on the path
if (align == ALIGN_END) {
currentPosition += pathLength - textLength;
} else if (align == ALIGN_MIDDLE) {
currentPosition += (pathLength - textLength) / 2;
}
// iterate through the GlyphVector placing each glyph
for (int i = 0; i < glyphs.getNumGlyphs(); i++) {
GlyphMetrics gm = glyphs.getGlyphMetrics(i);
float charAdvance = gm.getAdvance();
Shape glyph = glyphs.getGlyphOutline(i);
// if lengthAdjust was GLYPHS, then scale the glyph
// by the lengthRatio in the X direction
// FIXME: for vertical text this will be the Y direction
if (lengthAdjustMode == ADJUST_GLYPHS) {
AffineTransform scale = AffineTransform.getScaleInstance(lengthRatio, 1f);
glyph = scale.createTransformedShape(glyph);
// charAdvance has to scale accordingly
charAdvance *= lengthRatio;
}
float glyphWidth = (float) glyph.getBounds2D().getWidth();
// Use either of these to calculate the mid point
// of the character along the path.
// If you change this, you must also change the
// transform on the glyph down below
// In some case this gives better layout, but
// the way it is at the moment is a closer match
// to the textPath layout from the SVG spec
//float charMidPos = currentPosition + charAdvance / 2f;
float charMidPos = currentPosition + glyphWidth / 2f;
// Calculate the actual point to place the glyph around
Point2D charMidPoint = pl.pointAtLength(charMidPos);
// Check if the glyph is actually on the path
if (charMidPoint != null) {
// Calculate the normal to the path (midline of glyph)
float angle = pl.angleAtLength(charMidPos);
// Define the transform of the glyph
AffineTransform glyphTrans = new AffineTransform();
// translate to the point on the path