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/** @author Casey Bowman
* @version 1.1
* @date Tue Mar 10 13:52:41 EDT 2015
* @see (License) MIT style license
*/
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.scene.layout.Pane;
import javafx.scene.input.MouseEvent;
import javafx.event.EventHandler;
import java.util.Arrays;
import java.util.Random;
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/** A simple javafx application to display a rectangle in a window.
* @const screenWidth the width of the window
* @const screenHeight the height of the window
* @const rectWidth the width of the rectangle
* @const rectHeight the height of the rectangle
* @const rectX the x-coordinate of the top left corner of the rectangle
* @const rectY the y-coordinate of the top left corner of the rectangle
* @const step the max step size for the movement of the rectangle
* @const bord makes sure the rectangle stays away from the edges
* @const rand a random number generator
* @const root the group to which the scene belongs
* @const scene the scene for this window
* @const pane a pane to hold the rectangle
*/
public class FXRectangleMove extends Application
{
private int screenWidth = 600;
private int screenHeight = 600;
private int rectWidth = 100;
private int rectHeight = 100;
private int rectX = 100;
private int rectY = 100;
private int step = 300;
private int bord = 10;
private Random rand = new Random ();
Group root = new Group ();
Scene scene = new Scene (root, screenWidth, screenHeight, Color.web ("#33CC99")); // the scene needs a group, width, height, and color
Pane pane = new Pane ();
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/** Main method. Calls internal method launch (String[])
* of Application class.
*/
public static void main (String[] args)
{
launch (args);
} // main
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/** start method. Called by launch. Directs the creation of
* components and windows for the fx application.
* @param stage the stage for this application
*/
@Override
public void start (Stage stage)
{
Rectangle r = makeRect (rectX, rectY, rectWidth, rectHeight);
setListener (r);
setRect (r);
addRect (r);
addPane ();
showWindow (stage);
}
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/** this method creates a Rectangle of the appropriate size.
* @param x the x-coordinate for the top left corner of the rectangle
* @param y the y-coordinate for the top left corner of the rectangle
* @param w the width of the rectangle
* @param h the height of the rectangle
*/
public Rectangle makeRect (int x, int y, int w, int h) { return new Rectangle (x, y, w, h); }
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/** This method will create a mouse click listener for the rectangle.
* setOnMouseClicked creates an EventHandler object.
*
* @param r the rectangle
*/
public void setListener (Rectangle r)
{
r.setOnMouseClicked (new EventHandler ()
{
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/** The handle method for this EventHandler object must be
* overridden. In this case, the method calls a method to
* move the rectangle, and another method to color it.
*
* @param t the mouse event that was triggered
*/
@Override
public void handle (MouseEvent t)
{
moveRect ();
colorRect ();
}
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/** moveRect handles the movement of the rectangle by grabbing
* two random integers from rand. It then computes a new
* x-coordinate and a new y-coordinate. If these would put
* the rectangle off the screen, then they are changed.
*/
public void moveRect ()
{
int xdiff = rand.nextInt (step) - step / 2;
int ydiff = rand.nextInt (step) - step / 2;
int currX = (int) r.getX ();
int currY = (int) r.getY ();
int newX = currX + xdiff;
int newY = currY + ydiff;
if (newX < bord || newX > screenWidth - rectWidth - bord) newX = currX - xdiff;
if (newY < bord || newY > screenHeight - rectHeight - bord) newY = currY - ydiff;
r.setX (newX);
r.setY (newY);
}
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/** colorRect grabs three random doubles from rand that are by
* default between 0 and 1, which are then used to create a new
* color.
*/
public void colorRect ()
{
double[] rgb = new double[3];
for (int i = 0; i < rgb.length; i++) rgb[i] = rand.nextDouble ();
r.setFill (new Color (rgb[0], rgb[1], rgb[2], 1.0));
}
});
}
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/** this method sets some stylistic parameters of the rectangle. I've
* chosen to set the arc width and height which rounds the corners,
* I've set the stroke color and width which styles the border,
* and I've set the fill which colors the interior of the rectangle.
* @param r the rectangle to style
*/
public void setRect (Rectangle r)
{
r.setArcWidth (10);
r.setArcHeight (10);
r.setStroke (Color.BLACK);
r.setStrokeWidth (3);
r.setFill (Color.web ("#EE3344"));
} // setRect
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/** this method adds a rectangle to the pane.
* @param r the rectangle to add.
*/
public void addRect (Rectangle r) { pane.getChildren (). add (r); }
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/** this method adds the pane to the group.
*/
public void addPane () { root.getChildren (). add (pane); }
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/** this method displays the window.
* @param stage the stage to display.
*/
public void showWindow (Stage stage)
{
stage.setScene (scene);
stage.show ();
} // showWindow
} // FXRectangle