ShapeFactory.java

package uk.co.flyingsquirrels.rendering;

import org.newdawn.slick.SlickException;
import org.newdawn.slick.geom.Shape;
import org.newdawn.slick.geom.Transform;
import org.newdawn.slick.svg.InkscapeLoader;

public class ShapeFactory {

	public static Shape loadFromSvg(String filename, float xLength,
			float transX, float transY) {
		try {
			Shape shape = InkscapeLoader.load(filename).getFigure(0).getShape();
			float minX = Float.MAX_VALUE;
			float minY = Float.MAX_VALUE;
			float maxX = Float.MIN_VALUE;
			float maxY = Float.MIN_VALUE;
			for (int i = 0; i < shape.getPointCount(); i++) {
				float[] point = shape.getPoint(i);
				if (point[0] < minX) {
					minX = point[0];
				}
				if (point[0] > maxX) {
					maxX = point[0];
				}
				if (point[1] < minY) {
					minY = point[1];
				}
				if (point[1] > maxY) {
					maxY = point[1];
				}
			}
			float scale = xLength / (maxX - minX);
			float midX = (minX + maxX) / 2;
			float midY = (minY + maxY) / 2;

			Transform scaleTransform = Transform.createScaleTransform(scale,
					-scale);
			Transform translateTransform = Transform.createTranslateTransform(
					-midX + transX, -midY + transY);
			Transform transform = scaleTransform
					.concatenate(translateTransform);
			return shape.transform(transform);
		} catch (SlickException e) {
			throw new RuntimeException(e);
		}
	}
}