//
// Jeff Mark
// May 4, 1996
// CS 162
// Program 2 - Shapes Applet
//
import java.applet.*;
import java.awt.*;
// Sets up the Drawing Area, handles the mouse events.
public class DrawShapes extends Applet
{
// The drawing Area
private CoordinateArea area;
public void init()
{
// Set background color
this.setBackground(Color.white);
// Add the drawing area
area = new CoordinateArea(this);
add(area);
}
// Called when user clicks the buttons or chooses a color/shape
public boolean action(Event event, Object arg)
{
// If clear was clicked
if (event.target == area.clear) {
return area.clear();
}
// If shift right was clicked
else if (event.target == area.rightShift) {
return area.rightShift();
}
// If shift left was clicked
else if (event.target == area.leftShift) {
return area.leftShift();
}
// If randomize the colors was clicked.
else if (event.target == area.randomColor) {
return area.randomColor();
}
// Otherwise let superclass deal with it.
return super.action(event, arg);
}
}
class CoordinateArea extends Canvas
{
private Point p1; // Initial coordiantes of object.
private Point p2; // Final coordinates of the object.
private DrawShapes controller;
private Dimension mySize = new Dimension(700, 300);
// Shift amounts
private static Point leftShiftAmount = new Point(-10, 0);
private static Point rightShiftAmount = new Point(10, 0);
// Buttons and Menus to control what we are drawing
public Button leftShift;
public Button clear;
public Button rightShift;
public Button randomColor;
public Choice color_choices;
public Choice shape_choices;
public CoordinateArea(DrawShapes controller)
{
super();
this.controller = controller;
// Create left shift button
leftShift = new Button("Shift Left");
controller.add(leftShift);
// Create clear button
clear = new Button("Clear");
controller.add(clear);
// Create right shift button
rightShift = new Button("Shift Right");
controller.add(rightShift);
// Create the random color button.
randomColor = new Button("Randomize Colors");
controller.add(randomColor);
// Create a menu of colors and add it to the applet
color_choices = new Choice();
color_choices.addItem("RANDOM");
color_choices.addItem("black");
color_choices.addItem("blue");
color_choices.addItem("red");
color_choices.addItem("yellow");
color_choices.addItem("green");
controller.add(new Label("Color:"));
controller.add(color_choices);
// Create a menu of shapes and add it to the applet
shape_choices = new Choice();
shape_choices.addItem("RANDOM");
shape_choices.addItem("Point");
shape_choices.addItem("Line");
shape_choices.addItem("Square");
shape_choices.addItem("Circle");
controller.add(new Label("Shape:"));
controller.add(shape_choices);
}
public Dimension minimumSize()
{
return mySize;
}
public Dimension preferredSize()
{
return mySize;
}
// List of shapes created and index to the list.
private static int MaxShapes = 100;
private Shapes mosaic[] = new Shapes[MaxShapes];
private int index = -1;
private int Randomize(int range)
{
double result;
result = Math.random() * range;
return ((int) result);
}
private void selectColor()
{
String select = color_choices.getSelectedItem();
Color pickColor = Color.black;
if (select == "RANDOM")
pickColor = new Color(Randomize(255), Randomize(255),
Randomize(255));
else if (select == "black") pickColor = Color.black;
else if (select == "blue") pickColor = Color.blue;
else if (select == "red") pickColor = Color.red;
else if (select == "yellow") pickColor = Color.yellow;
else if (select == "green") pickColor = Color.green;
mosaic[index].setColor(pickColor);
//controller.showStatus("Color is --> " + select);
}
// Picks a new shape -> the one selected by shape_choice
private void selectShape()
{
int select = shape_choices.getSelectedIndex();
int numitems = shape_choices.countItems() - 1;
if (select == 0)
select = Randomize(numitems) + 1;
// Increase the count on the objects drawn
index++;
switch(select) {
case 1 : mosaic[index] = new Dot();
break;
case 2 : mosaic[index] = new Line();
break;
case 3 : mosaic[index] = new Square();
break;
case 4 : mosaic[index] = new Circle();
break;
}
//controller.showStatus("Shape selected = " + select);
}
// Called when user clicks the mouse to place an object
public boolean mouseDown(Event e, int x, int y)
{
// Test if we have reached the max
if (index == MaxShapes - 1) {
return false;
}
controller.showStatus("Mouse Down");
// Pick a new shape and color
selectShape();
selectColor();
// Save the coordinates - they are both initial and final points
p1 = new Point(x, y);
p2 = new Point(x, y);
mosaic[index].setPoints(p1, p2);
repaint();
return true;
}
// Called when the user scribbles with the mouse button down
public boolean mouseDrag(Event e, int x, int y)
{
// Test if we have reached the max
if (index == MaxShapes - 1) {
return false;
}
// Save intermediate coordinates
p2 = new Point(x, y);
controller.showStatus("Mouse Drag (" + p1.x + "," + p1.y + ") to (" + p2.x + "," + p2.y + ")");
// Set the new points of this object
mosaic[index].setPoints(p1, p2);
repaint();
return true;
}
// Called when the user "Unclicks" the mouse
public boolean mouseUp(Event e, int x, int y)
{
controller.showStatus("");
// Test if we have reached the max
if (index == MaxShapes - 1) {
return false;
}
// Save final coordinates.
p2 = new Point(x, y);
mosaic[index].setPoints(p1, p2);
repaint();
return true;
}
// Called by DrawShapes when the Random Color button is pressed.
// Changes the color of all the objects to something random.
public boolean randomColor()
{
int i, r, g, b;
for (i = 0; i <= index; i++) {
r = Randomize(255);
g = Randomize(255);
b = Randomize(255);
mosaic[i].setColor(new Color(r, g, b));
}
repaint();
return true;
}
// Called by DrawShapes class when user click on clear button;
public boolean clear()
{
// Set number of objects to -1 and repaint the screen
index = -1;
repaint();
return true;
}
// Called by DrawShapes when leftShift is clicked
public boolean leftShift()
{
int i;
for (i = 0; i <= index; i++)
mosaic[i].moveBy(leftShiftAmount);
repaint();
return true;
}
// Called by DrawShapes when rightShift is clicked
public boolean rightShift()
{
int i;
for (i = 0; i <= index; i++)
mosaic[i].moveBy(rightShiftAmount);
repaint();
return true;
}
/**
** BEGIN Double buffering code -- to prevent flickering
**/
int oldWidth = 0;
int oldHeight = 0;
Image offScreenImage;
Graphics offScreen;
public synchronized void update(Graphics g)
{
int width = getSize().width;
int height = getSize().height;
if (oldWidth != width || oldHeight != height) {
offScreenImage = createImage(width, height);
offScreen = offScreenImage.getGraphics();
oldWidth = width;
oldHeight = height;
}
paint(offScreen);
g.drawImage(offScreenImage, 0, 0, this);
}
/**
** END Double buffering code.
**/
// Paints all the objects.
public void paint(Graphics g)
{
int i;
// Do this always to erase the intermediate steps
g.setColor(Color.white);
g.fillRect(0, 0, 700, 300);
// Paint the objects in the Shapes array
if (index >= 0) {
for (i = 0; i <= index; i++) {
mosaic[i].draw(g);
g.setColor(Color.black);
g.drawString("Number of objects: " + (index+1) + " of " +
MaxShapes, 5, 260);
if (index+1 == MaxShapes)
g.drawString("You are at your max, press --Clear-- " +
"to make more shapes...", 200, 260);
}
}
}
}