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// This was project #6 by Christopher Sharp in the CS335 class of
// Spring 04 Semester at the University of Arizona.
// March 5, 2004 (Previously Feb 27) - 6_David_Sharp_Chris
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
// The main method is in the other file RectanglesFrame.
// The class draws the rectangles, the border if required, and
// fills in the rectangles with the specified colors.
public class RectanglesPanel extends JPanel {
private int myRows,myCols,myOldRows,myOldCols,myMouseX,myMouseY;
private Color myColor;
private Color [][] myColors;
private boolean myGrid;
private boolean myMouseValid = false;
// Initialize with mouse invalid and not clicked.
public RectanglesPanel(int rows, int cols) {
myColors = new Color[rows][cols];
for (int i=0; i<rows; i++)
for (int j=0; j<cols; j++)
myColors[i][j] = Color.WHITE;
myRows = myOldRows = rows;
myCols = myOldCols = cols;
myMouseValid = false;
}
// Adjust array size
private void adjustArray(int oldrows, int rows, int oldcols, int cols) {
Color[][] temp = new Color[rows][cols];
for (int i=0; i<rows; i++)
for (int j=0; j<cols; j++)
if (i < oldrows && j < oldcols)
temp[i][j] = myColors[i][j];
myRows = myOldRows = rows;
myCols = myOldCols = cols;
myColors = temp;
}
// Update state of draw/not draw grid.
public void drawRectangles(boolean grid) {
myGrid = grid;
repaint();
}
// Update clicked mouse coordinates.
public void setMouseXY(int x, int y) {
myMouseX = x;
myMouseY = y;
repaint();
}
// Update rows.
public void changeRows(int rows) {
myRows = rows;
repaint();
}
// Update columns.
public void changeCols(int cols) {
myCols = cols;
repaint();
}
// Update color.
public void setColor(Color color) {
myColor = color;
}
// Paint screen.
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
int width = this.getWidth();
int height = this.getHeight();
int rowPixels = width/myCols;
int colPixels = height/myRows;
double leftBorder,rightBorder,topBorder,bottomBorder;
// Adjust array size if required.
if (myRows != myOldRows || myCols != myOldCols)
adjustArray(myOldRows, myRows, myOldCols, myCols);
// Calculate borders, if present.
int i = width%myCols;
if (i > 0) { // Draw left and right borders.
if (i%2 == 0) { // Even pixels.
leftBorder = i/2 - 1;
rightBorder = width - i/2;
}
else { // Odd pixels.
leftBorder = (i+1)/2 - 1;
rightBorder = width - (i-1)/2;
}
}
else { // Set borders off screen, i.e. none.
leftBorder = -1.0;
rightBorder = width + 1;
}
i = height%myRows;
if (i > 0) { // Draw top and bottom borders.
if (i%2 == 0) { // Even pixels.
topBorder = i/2 - 1;
bottomBorder = height - i/2;
}
else { // Odd pixels.
topBorder = (i+1)/2 - 1;
bottomBorder = height - (i-1)/2;
}
}
else { // Set borders off screen, i.e. none.
topBorder = -1;
bottomBorder = height + 1;
}
g2.setPaint(Color.BLACK);
// Draw borders if required.
Line2D.Double line = new Line2D.Double();
if (leftBorder >= 0) {
for (i=0; i<=leftBorder; i++) {
line.setLine(i, 0, i, height);
g2.draw(line);
}
}
if (rightBorder < width) {
for (i=(int)rightBorder; i<width; i++) {
line.setLine(i, 0, i, height);
g2.draw(line);
}
}
if (topBorder >= 0) {
for (i=0; i<=topBorder; i++) {
line.setLine(0, i, width,i);
g2.draw(line);
}
}
if (bottomBorder < height) {
for (i=(int)bottomBorder; i<height; i++) {
line.setLine(0, i, width,i);
g2.draw(line);
}
}
// Test to see if last mouse click is in range.
if (myMouseX > leftBorder && myMouseX < rightBorder &&
myMouseY > topBorder && myMouseY < bottomBorder)
myMouseValid = true;
// Draw colred rectangles, updated with last mouse click if valid.
Rectangle2D.Double box = new Rectangle2D.Double();
for (i=0; i<myRows; i++) {
int top = i*colPixels+(int)topBorder+1;
for (int j=0; j<myCols; j++) {
int left = j*rowPixels+(int)leftBorder+1;
box.setRect(left, top, rowPixels, colPixels);
if (myColors[i][j] != null) {
g2.setPaint(myColors[i][j]);
g2.fill(box);
}
// If mouse is valid, find mouse's row and column.
if (myMouseValid && left + rowPixels - 1 >= myMouseX &&
top + colPixels - 1 >= myMouseY) {
// Trap invalid mouse click on grid.
if (myGrid && (left + rowPixels - 1 == myMouseX ||
top + colPixels - 1 == myMouseY))
myMouseValid = false;
myMouseX = -1;
myMouseY = -1;
// Fill in rectangle with selected color, then set
// mouse to invalid.
if (myMouseValid) {
myColors[i][j] = myColor;
g2.setPaint(myColor);
g2.fill(box);
myMouseValid = false;
}
}
}
}
// Draw grid lines if selected.
if (myGrid) {
g2.setPaint(Color.BLACK);
double coord;
for (i = 0; i<myCols; i++) { // Draw verticles lines.
coord = (double)((i+1)*rowPixels)+leftBorder;
line.setLine(coord, 0.0, coord, height);
g2.draw(line);
}
for (i = 0; i<myRows; i++) { // Draw horizontal lines
coord = (double)((i+1)*colPixels)+topBorder;
line.setLine(0.0, coord, width, coord);
g2.draw(line);
}
}
}
}
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