com.jhlabs.awt.TextStroke Maven / Gradle / Ivy
/*
This file is based on code copied from project Java Image Processing, JH Labs,
see the LICENSE file for further information.
*/
package com.jhlabs.awt;
import java.awt.Font;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.FlatteningPathIterator;
import java.awt.geom.GeneralPath;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
/**
* Stroke that paint a text.
*
* Slightly adapted to OTP from original source.
*
* @see http://www.jhlabs.com/java/java2d/strokes/
*/
public class TextStroke implements Stroke {
private static final float FLATNESS = 1;
private final String text;
private final Font font;
private final AffineTransform t = new AffineTransform();
private boolean stretchToFit = false;
private boolean repeat = false;
public TextStroke(String text, Font font) {
this(text, font, true, false);
}
public TextStroke(String text, Font font, boolean stretchToFit, boolean repeat) {
this.text = text;
this.font = font;
this.stretchToFit = stretchToFit;
this.repeat = repeat;
}
public Shape createStrokedShape(Shape shape) {
FontRenderContext frc = new FontRenderContext(null, true, true);
GlyphVector glyphVector = font.createGlyphVector(frc, text);
GeneralPath result = new GeneralPath();
PathIterator it = new FlatteningPathIterator(shape.getPathIterator(null), FLATNESS);
float[] points = new float[6];
float moveX = 0, moveY = 0;
float lastX = 0, lastY = 0;
float thisX = 0, thisY = 0;
int type = 0;
float next = 0;
int currentChar = 0;
int length = glyphVector.getNumGlyphs();
if (length == 0) return result;
float factor = stretchToFit
? measurePathLength(shape) / (float) glyphVector.getLogicalBounds().getWidth()
: 1.0f;
float height = (float) glyphVector.getLogicalBounds().getHeight();
float nextAdvance = 0;
while (currentChar < length && !it.isDone()) {
type = it.currentSegment(points);
switch (type) {
case PathIterator.SEG_MOVETO:
moveX = lastX = points[0];
moveY = lastY = points[1];
result.moveTo(moveX, moveY);
nextAdvance = glyphVector.getGlyphMetrics(currentChar).getAdvance() * 0.5f;
next = nextAdvance;
break;
case PathIterator.SEG_CLOSE:
points[0] = moveX;
points[1] = moveY;
// Fall into....
case PathIterator.SEG_LINETO:
thisX = points[0];
thisY = points[1];
float dx = thisX - lastX;
float dy = thisY - lastY;
float distance = (float) Math.sqrt(dx * dx + dy * dy);
if (distance >= next) {
float r = 1.0f / distance;
float angle = (float) Math.atan2(dy, dx);
while (currentChar < length && distance >= next) {
Shape glyph = glyphVector.getGlyphOutline(currentChar);
Point2D p = glyphVector.getGlyphPosition(currentChar);
float px = (float) p.getX();
float py = (float) p.getY();
float x = lastX + next * dx * r;
float y = lastY + next * dy * r;
float advance = nextAdvance;
nextAdvance = currentChar < length - 1
? glyphVector.getGlyphMetrics(currentChar + 1).getAdvance() * 0.5f
: 0;
t.setToTranslation(x, y);
t.rotate(angle);
t.translate(-px - advance, -py + (height * factor) / 2.0f);
result.append(t.createTransformedShape(glyph), false);
next += (advance + nextAdvance) * factor;
currentChar++;
if (repeat) currentChar %= length;
}
}
next -= distance;
lastX = thisX;
lastY = thisY;
break;
}
it.next();
}
return result;
}
public float measurePathLength(Shape shape) {
PathIterator it = new FlatteningPathIterator(shape.getPathIterator(null), FLATNESS);
float[] points = new float[6];
float moveX = 0, moveY = 0;
float lastX = 0, lastY = 0;
float thisX = 0, thisY = 0;
int type = 0;
float total = 0;
while (!it.isDone()) {
type = it.currentSegment(points);
switch (type) {
case PathIterator.SEG_MOVETO:
moveX = lastX = points[0];
moveY = lastY = points[1];
break;
case PathIterator.SEG_CLOSE:
points[0] = moveX;
points[1] = moveY;
// Fall into....
case PathIterator.SEG_LINETO:
thisX = points[0];
thisY = points[1];
float dx = thisX - lastX;
float dy = thisY - lastY;
total += (float) Math.sqrt(dx * dx + dy * dy);
lastX = thisX;
lastY = thisY;
break;
}
it.next();
}
return total;
}
}