com.jhlabs.awt.ShapeStroke Maven / Gradle / Ivy

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The OpenTripPlanner multimodal journey planning system
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/*
  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.Shape;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.awt.geom.FlatteningPathIterator;
import java.awt.geom.GeneralPath;
import java.awt.geom.PathIterator;
import java.awt.geom.Rectangle2D;

/**
 * Stroke that draw a shape.
 * 
 * Slightly adapted to OTP from original source.
 *
 * @see http://www.jhlabs.com/java/java2d/strokes/
 *
 */
public class ShapeStroke implements Stroke {
    private Shape theShape;

    private float advance;

    private float phase;

    private AffineTransform t = new AffineTransform();

    private static final float FLATNESS = 1;

    public ShapeStroke(Shape shape, float width, float advance, float phase) {
        this.advance = advance;
        this.phase = phase;
        Rectangle2D bounds = shape.getBounds2D();
        double scale = width / bounds.getHeight();
        t.setToScale(scale, scale);
        t.translate(-bounds.getCenterX(), -bounds.getCenterY());
        this.theShape = t.createTransformedShape(shape);
    }

    public Shape createStrokedShape(Shape shape) {
        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 = phase;

        while (!it.isDone()) {
            type = it.currentSegment(points);
            switch (type) {
            case PathIterator.SEG_MOVETO:
                moveX = lastX = points[0];
                moveY = lastY = points[1];
                result.moveTo(moveX, moveY);
                next = 0;
                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 (distance >= next) {
                        float x = lastX + next * dx * r;
                        float y = lastY + next * dy * r;
                        t.setToTranslation(x, y);
                        t.rotate(angle);
                        result.append(t.createTransformedShape(theShape), false);
                        next += advance;
                    }
                }
                next -= distance;
                lastX = thisX;
                lastY = thisY;
                break;
            }
            it.next();
        }

        return result;
    }
}