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The SteelSeries is a javabeans component library that contains gauges.
You will find linear and radial gauges. In addition you will also find
digital displays, indicators from cars and some instruments from airplanes and
sailboats.
package eu.hansolo.steelseries.tools;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.util.ArrayList;
/**
* @author Gerrit Grunwald
*/
public enum Scaler {
INSTANCE;
/**
* Returns a double that represents the area of the given point array of a polygon
* @param POLYGON
* @param N
* @return a double that represents the area of the given point array of a polygon
*/
private double calcSignedPolygonArea(final Point2D[] POLYGON) {
final int N = POLYGON.length;
int i;
int j;
double area = 0;
for (i = 0; i < N; i++) {
j = (i + 1) % N;
area += POLYGON[i].getX() * POLYGON[j].getY();
area -= POLYGON[i].getY() * POLYGON[j].getX();
}
area /= 2.0;
return (area);
//return(area < 0 ? -area : area); for unsigned
}
/**
* Returns a Point2D object that represents the center of mass of the given point array which represents a
* polygon.
* @param POLYGON
* @return a Point2D object that represents the center of mass of the given point array
*/
public Point2D calcCenterOfMass(final Point2D[] POLYGON) {
final int N = POLYGON.length;
double cx = 0;
double cy = 0;
double area = calcSignedPolygonArea(POLYGON);
final Point2D CENTROID = new Point2D.Double();
int i;
int j;
double factor = 0;
for (i = 0; i < N; i++) {
j = (i + 1) % N;
factor = (POLYGON[i].getX() * POLYGON[j].getY() - POLYGON[j].getX() * POLYGON[i].getY());
cx += (POLYGON[i].getX() + POLYGON[j].getX()) * factor;
cy += (POLYGON[i].getY() + POLYGON[j].getY()) * factor;
}
area *= 6.0f;
factor = 1 / area;
cx *= factor;
cy *= factor;
CENTROID.setLocation(cx, cy);
return CENTROID;
}
/**
* Returns an array of all points of the given shape
* @param SHAPE
* @return an array of all points of the given shape
*/
public Point2D[] getPointArrayOfShape(final Shape SHAPE) {
ArrayList pointList = new ArrayList(32);
final PathIterator PATH_ITERATOR = SHAPE.getPathIterator(null);
int lastMoveToIndex = -1;
while (!PATH_ITERATOR.isDone()) {
final double[] COORDINATES = new double[6];
switch (PATH_ITERATOR.currentSegment(COORDINATES)) {
case PathIterator.SEG_MOVETO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
lastMoveToIndex++;
break;
case PathIterator.SEG_LINETO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
break;
case PathIterator.SEG_QUADTO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
pointList.add(new Point2D.Double(COORDINATES[2], COORDINATES[3]));
break;
case PathIterator.SEG_CUBICTO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
pointList.add(new Point2D.Double(COORDINATES[2], COORDINATES[3]));
pointList.add(new Point2D.Double(COORDINATES[4], COORDINATES[5]));
break;
case PathIterator.SEG_CLOSE:
if (lastMoveToIndex >= 0) {
pointList.add(pointList.get(lastMoveToIndex));
}
break;
}
PATH_ITERATOR.next();
}
final Point2D[] POINT_ARRAY = new Point2D[pointList.size()];
return POINT_ARRAY;
}
/**
* Returns a Point2D object that represents the center of mass of the given shape.
* @param SHAPE
* @return a Point2D object that represents the center of mass of the given shape
*/
public Point2D getCentroid(final Shape SHAPE) {
ArrayList pointList = new ArrayList(32);
final PathIterator PATH_ITERATOR = SHAPE.getPathIterator(null);
int lastMoveToIndex = -1;
while (!PATH_ITERATOR.isDone()) {
final double[] COORDINATES = new double[6];
switch (PATH_ITERATOR.currentSegment(COORDINATES)) {
case PathIterator.SEG_MOVETO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
lastMoveToIndex++;
break;
case PathIterator.SEG_LINETO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
break;
case PathIterator.SEG_QUADTO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
pointList.add(new Point2D.Double(COORDINATES[2], COORDINATES[3]));
break;
case PathIterator.SEG_CUBICTO:
pointList.add(new Point2D.Double(COORDINATES[0], COORDINATES[1]));
pointList.add(new Point2D.Double(COORDINATES[2], COORDINATES[3]));
pointList.add(new Point2D.Double(COORDINATES[4], COORDINATES[5]));
break;
case PathIterator.SEG_CLOSE:
if (lastMoveToIndex >= 0) {
pointList.add(pointList.get(lastMoveToIndex));
}
break;
}
PATH_ITERATOR.next();
}
final Point2D[] POINT_ARRAY = new Point2D[pointList.size()];
pointList.toArray(POINT_ARRAY);
return (calcCenterOfMass(POINT_ARRAY));
}
/**
* Returns a Point2D object that represents the center of mass of the given point array
* @param POINT_ARRAY
* @return a Point2D object that represents the center of mass of the given point array
*/
public Point2D getCentroid(final Point2D[] POINT_ARRAY) {
return calcCenterOfMass(POINT_ARRAY);
}
/**
* Returns a scaled version of the given convex shape, calculated by the given scale factor.
* The scaling will be calculated around the centroid of the shape.
* @param SHAPE
* @param SCALE_FACTOR
* @return a scaled version of the given convex shape, calculated around the centroid by the given scale factor.
*/
public java.awt.Shape scale(final Shape SHAPE, final double SCALE_FACTOR) {
final Point2D CENTROID = getCentroid(SHAPE);
final AffineTransform TRANSFORM = AffineTransform.getTranslateInstance((1.0 - SCALE_FACTOR) * CENTROID.getX(), (1.0 - SCALE_FACTOR) * CENTROID.getY());
TRANSFORM.scale(SCALE_FACTOR, SCALE_FACTOR);
return TRANSFORM.createTransformedShape(SHAPE);
}
/**
* Returns a scaled version of the given convex shape, calculated by the given scale factor.
* The scaling will be calculated around the given point.
* @param SHAPE
* @param SCALE_FACTOR
* @param SCALE_CENTER
* @return a scaled version of the given convex shape, calculated around the given point with the given scale factor.
*/
public java.awt.Shape scale(final Shape SHAPE, final double SCALE_FACTOR, final Point2D SCALE_CENTER) {
final AffineTransform TRANSFORM = AffineTransform.getTranslateInstance((1.0 - SCALE_FACTOR) * SCALE_CENTER.getX(), (1.0 - SCALE_FACTOR) * SCALE_CENTER.getY());
TRANSFORM.scale(SCALE_FACTOR, SCALE_FACTOR);
return TRANSFORM.createTransformedShape(SHAPE);
}
}