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Jose Caban
288
CS2335/lab4/Lab_files/Examples/Graphics/SimpleAnimation.java
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288
CS2335/lab4/Lab_files/Examples/Graphics/SimpleAnimation.java
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import javax.swing.JFrame;
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import javax.swing.JPanel;
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import java.awt.event.WindowAdapter;
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import java.awt.event.WindowEvent;
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import java.awt.Container;
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import java.awt.Graphics;
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import java.awt.Color;
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import java.awt.Polygon;
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import java.awt.event.ActionListener;
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import java.awt.event.ActionEvent;
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/**
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* CS2335 Lab 6 Example
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*
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* <PRE>
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* SimpleAnimation.java shows the basics of how to create an animation
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* <PRE>
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*
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* @author <A HREF="mailto:tedchoc@cc.gatech.edu">Ted Choc</A>
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* @version Version 1.4, February 20, 2003
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*/
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public class SimpleAnimation {
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/**
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* JFrame to which everything is rendered
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*/
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private JFrame guiFrame;
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/**
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* Content Pane of the JFrame
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*/
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private Container contentPane;
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/**
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* The panel to which all the graphics will be drawn
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*/
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private JPanel graphicsPanel;
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/**
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* Determines the current rotation of the polygon
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*/
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private int rotationValue = 0;
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/**
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* Determines how the current polygon should be scaled
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*/
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private double scaleValue = 1.0;
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/**
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* Determines whether to shrink or grow the polygon
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*/
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private boolean increasingScale = true;
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/**
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* Determines what color the square should be
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* 0 - Red, 1 - Green, 2 - Blue
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*/
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private int colorSelection = 0;
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/**
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* Determines the current color
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*/
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private Color currentColor = Color.red;
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/**
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* A modifier for guiFrame
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* @param guiFrame new guiFrame
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*/
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public void setGuiFrame(JFrame guiFrame) {
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this.guiFrame = guiFrame;
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}
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/**
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* A modifier for contentPane
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* @param contentPane new contentPane
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*/
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public void setContentPane(Container contentPane) {
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this.contentPane = contentPane;
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}
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/**
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* A modifier for graphicsPanel
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* @param graphicsPanel new graphicsPanel
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*/
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public void setGraphicsPanel(JPanel graphicsPanel) {
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this.graphicsPanel = graphicsPanel;
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}
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/**
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* An accessor for guiFrame
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* @return JFrame guiFrame
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*/
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public JFrame getGuiFrame() {
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return this.guiFrame;
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}
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/**
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* An accessor for contentPane
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* @return Container contentPane
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*/
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public Container getContentPane() {
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return this.contentPane;
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}
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/**
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* An accessor for graphicsPanel
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* @return JPanel graphicsPanel
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*/
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public JPanel getGraphicsPanel() {
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return this.graphicsPanel;
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}
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/**
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* Create the window and sets it up for drawing
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*/
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public void makeWindow() {
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guiFrame = new JFrame("Simple Animation");
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guiFrame.addWindowListener(new WindowAdapter() {
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public void windowClosing(WindowEvent we) {
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System.exit(0);
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}
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});
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contentPane = guiFrame.getContentPane();
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graphicsPanel = new JPanel() {
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public void paintComponent(Graphics g) {
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super.paintComponent(g);
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drawGraphics(g);
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}
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};
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contentPane.add(graphicsPanel);
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guiFrame.setSize(500, 500);
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guiFrame.setVisible(true);
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graphicsPanel.setBackground(Color.lightGray);
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}
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/**
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* Draws the polygon on the Graphics
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* @param g the graphics object to be drawn on
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*/
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public void drawGraphics(Graphics g) {
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int[] xCoord = { 200, 300, 300, 200 };
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int[] yCoord = { 200, 200, 300, 300 };
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Polygon rectangle = new Polygon(xCoord, yCoord, 4);
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//g.fillPolygon(rectangle);
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g.setColor(currentColor);
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g.fillPolygon(rotatePolygon(scalePolygon(rectangle, scaleValue),
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rotationValue));
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//g.setColor(Color.blue);
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//g.fillPolygon(rotatePolygon(rectangle, 60));
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}
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/**
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* Rotates the polygon by some angle - look into AffineTransform
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* for a better way to handle this. This is also kind of a
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* hack because it only works for rectangles, but it works for
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* this example
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* Rotation Matrix
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* | cos(a) -sin(a) 0 |
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* | sin(a) cos(a) 0 |
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* | 0 0 1 |
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* @param p polygon to be rotated
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* @param theta the angle to be rotated by
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* @return Polygon that has been rotated
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*/
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public Polygon rotatePolygon(Polygon p, int theta) {
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int[] xCoord = p.xpoints;
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int[] yCoord = p.ypoints;
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int xMidpoint = ((xCoord[1] - xCoord[0]) / 2) + xCoord[0];
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int yMidpoint = ((yCoord[2] - yCoord[1]) / 2) + yCoord[1];
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p.translate(-xMidpoint, -yMidpoint);
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xCoord = p.xpoints;
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yCoord = p.ypoints;
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int[] xRotCoord = new int[p.xpoints.length];
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int[] yRotCoord = new int[p.ypoints.length];
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int numPoints = p.npoints;
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double thetaRad = Math.toRadians((double) theta);
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for (int i = 0; i < numPoints; i++) {
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xRotCoord[i] = (int) (xCoord[i] * Math.cos(thetaRad))
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+ (int) (yCoord[i] * Math.sin(thetaRad));
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yRotCoord[i] = (int) (-(xCoord[i]) * Math.sin(thetaRad))
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+ (int) (yCoord[i] * Math.cos(thetaRad));
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}
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Polygon rotatedP = new Polygon(xRotCoord, yRotCoord, numPoints);
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rotatedP.translate(xMidpoint, yMidpoint);
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p.translate(xMidpoint, yMidpoint);
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return rotatedP;
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}
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/**
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* Scales the polygon by the specfied amount
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* @param p polygon prior to being scaled
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* @param scalar the amount to shrink or the grow the polygon by
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* @return the polygon that has been scaled
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*/
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public Polygon scalePolygon(Polygon p, double scalar) {
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int[] xCoord = p.xpoints;
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int[] yCoord = p.ypoints;
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int xMidpoint = ((xCoord[1] - xCoord[0]) / 2) + xCoord[0];
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int yMidpoint = ((yCoord[2] - yCoord[1]) / 2) + yCoord[1];
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p.translate(-xMidpoint, -yMidpoint);
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xCoord = p.xpoints;
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yCoord = p.ypoints;
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int[] xScaleCoord = new int[p.xpoints.length];
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int[] yScaleCoord = new int[p.ypoints.length];
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int numPoints = p.npoints;
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for (int i = 0; i < numPoints; i++) {
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xScaleCoord[i] = (int) (scalar * xCoord[i]);
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yScaleCoord[i] = (int) (scalar * yCoord[i]);
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}
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Polygon scaledP = new Polygon(xScaleCoord, yScaleCoord, numPoints);
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scaledP.translate(xMidpoint, yMidpoint);
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p.translate(xMidpoint, yMidpoint);
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return scaledP;
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}
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/**
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* Animates the square
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*/
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public void animateGraphics() {
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ActionListener listener = new ActionListener() {
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public void actionPerformed(ActionEvent e) {
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rotationValue = (rotationValue + 5) % 360;
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if (increasingScale == true) {
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if (scaleValue >= 2.5) {
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increasingScale = false;
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} else {
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scaleValue = scaleValue + 0.05;
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}
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} else {
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if (scaleValue <= 0.5) {
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increasingScale = true;
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} else {
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scaleValue = scaleValue - 0.05;
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}
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}
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if (colorSelection == 0) {
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currentColor = new Color(currentColor.getRed() - 5,
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currentColor.getGreen() + 5, 0);
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if (currentColor.getRed() <= 0) {
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colorSelection = 1;
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}
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} else if (colorSelection == 1) {
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currentColor = new Color(0,
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currentColor.getGreen() - 5,
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currentColor.getBlue() + 5);
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if (currentColor.getGreen() <= 0) {
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colorSelection = 2;
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}
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} else {
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currentColor = new Color(currentColor.getRed() + 5, 0,
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currentColor.getBlue() - 5);
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if (currentColor.getBlue() <= 0) {
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colorSelection = 0;
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}
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}
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graphicsPanel.repaint();
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}
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};
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javax.swing.Timer animation = new javax.swing.Timer(50, listener);
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animation.start();
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}
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/**
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* Creates a new SimpleAnimation and begins the animation
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* @param args Command Line Arguments
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*/
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public static void main(String[] args) {
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SimpleAnimation test = new SimpleAnimation();
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test.makeWindow();
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test.animateGraphics();
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}
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}
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