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DrawingArea.java 9.18 KiB
package GUI;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RectangularShape;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class DrawingArea extends JPanel {
/// enum for all different mode ///
enum Mode { FREEHAND, LINE, CIRCLE, RECTANGLE, OVAL, ERASE }
/// Canvas size parameter ///
private final static int AREA_WIDTH = 600;
private final static int AREA_HEIGHT = 500;
/// Shape to be drawn on the canvas ///
private Shape drawing;
private Point startPoint;
private Point previousPoint;
private Point currentPoint;
/// Default mode and color ///
private Color shapeColor = new Color(0, 0, 0);
private Mode currentMode = Mode.FREEHAND;
/// Create a empty canvas ///
private BufferedImage image = new BufferedImage(AREA_WIDTH, AREA_HEIGHT, BufferedImage.TYPE_INT_ARGB);
/// Drawing tool
private Graphics2D g2 = (Graphics2D) image.getGraphics();
public DrawingArea() {
setBackground(Color.WHITE); // Set Background color
setDoubleBuffered(false); // Non-buffered drawing
/// Antialiasing the graphic for smoothness ///
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
/// Mouse listeners for pressing///
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
startPoint = previousPoint = e.getPoint();
/// Instantiate object based on current mode ///
switch (currentMode) {
case FREEHAND:
case LINE:
drawing = new Line2D.Double();
break;
case ERASE:
case CIRCLE:
case OVAL:
drawing = new Ellipse2D.Double();
break;
case RECTANGLE:
drawing = new Rectangle2D.Double();
break;
}
}
});
/// Mouse motion listeners for dragging ///
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
currentPoint = e.getPoint();
int x = Math.min(startPoint.x, e.getX());
int y = Math.min(startPoint.y, e.getY());
int width = Math.abs(startPoint.x - e.getX());
int height = Math.abs(startPoint.y - e.getY());
switch (currentMode) {
/// Freehand drawing is continuously drawing line from current point to previous point ///
case FREEHAND:
((Line2D) drawing).setLine(currentPoint, previousPoint);
g2.setColor(shapeColor);
g2.draw(drawing);
previousPoint = currentPoint;
break;
/// Single line ///
case LINE:
((Line2D) drawing).setLine(startPoint, currentPoint);
break;
/// Eraser is continuously drawing "small white circle" from current point to previous point ///
case ERASE:
((Ellipse2D) drawing).setFrame(currentPoint.getX(), currentPoint.getY(), 10, 10);
g2.setColor(Color.WHITE);
g2.fill(drawing);
g2.draw(drawing);
break;
/// Single circle (How to draw more intuitively?)///
case CIRCLE:
double radius = Math.sqrt(width * width + height * height);
// ((Ellipse2D) drawing).setFrame(x, y, radius, radius);
((Ellipse2D) drawing).setFrame(startPoint.getX() - radius, startPoint.getY() - radius, 2 * radius, 2 * radius);
break;
/// Single oval ///
case OVAL:
((Ellipse2D) drawing).setFrame(x, y, width, height);
break;
/// Single rectangle ///
case RECTANGLE:
((Rectangle2D) drawing).setFrame(x, y, width, height);
break;
}
repaint();
}
});
/// Mouse listener for releasing ///
addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
/// Draw the final drawing to the buffered image ///
switch (currentMode) {
case OVAL:
case RECTANGLE:
case CIRCLE:
/// Abort drawing if 2D has no width or height ///
if (((RectangularShape) drawing).getWidth() == 0 || ((RectangularShape) drawing).getHeight() == 0) {
break;
}
case FREEHAND:
case LINE:
// Graphics2D g2 = (Graphics2D) image.getGraphics();
g2.setColor(shapeColor);
/// Uncomment the line below to fill the shapes with color ///
// g2.fill(drawing);
g2.draw(drawing);
}
g2 = (Graphics2D) image.getGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(shapeColor);
/// This repaint is needed if we want to fill the drawing shape with color
repaint();
drawing = null;
}
});
}
@Override
public Dimension getPreferredSize()
{
return isPreferredSizeSet() ?
super.getPreferredSize() : new Dimension(AREA_WIDTH, AREA_HEIGHT);
}
/// Create a white image to clear previous drawing ///
public void clear() {
image = new BufferedImage(AREA_WIDTH, AREA_HEIGHT, BufferedImage.TYPE_INT_ARGB);
g2 = (Graphics2D) image.getGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
repaint();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
/// Draw the whole image on JPanel ///
if (image != null) {
g.drawImage(image, 0, 0, null);
}
/// Draw temporary shape /// if (drawing != null) {
Graphics2D g2 = (Graphics2D) g;
/// Eraser has no border color ///
Color borderColor = currentMode != Mode.ERASE ? shapeColor : Color.WHITE;
g2.setColor(borderColor);
g2.draw(drawing);
}
}
/// File manipulations (PNG only) ///
public void saveFile() {
try {
ImageIO.write(image, "PNG", new File("Saved_White_Board.png"));
} catch (IOException e) {
e.printStackTrace();
}
}
public void saveAsFile(File file) {
try {
ImageIO.write(image, "PNG", file);
} catch (IOException e) {
e.printStackTrace();
}
}
public void openFile(File file) {
try {
image = ImageIO.read(file);
} catch (IOException e) {
e.printStackTrace();
}
repaint();
}
/// Drawing mode setters ///
public void setModeFreehand() {
currentMode = Mode.FREEHAND;
}
public void setModeLine() {
currentMode = Mode.LINE;
}
public void setModeCircle() {
currentMode = Mode.CIRCLE;
}
public void setModeRectangle() {
currentMode = Mode.RECTANGLE;
}
public void setModeOval() {
currentMode = Mode.OVAL;
}
public void setModeErase() {
currentMode = Mode.ERASE;
}
/// Drawing color setters ///
public void setColorAqua() {
shapeColor = new Color(0,255, 255);
}
public void setColorBlack() {
shapeColor = new Color(0, 0, 0); }
public void setColorBlue() {
shapeColor = new Color(0, 0, 255);
}
public void setColorFuchsia() {
shapeColor = new Color(255, 0, 255);
}
public void setColorGray() {
shapeColor = new Color(128, 128, 128);
}
public void setColorGreen() {
shapeColor = new Color(0, 128, 0);
}
public void setColorLime() {
shapeColor = new Color(0, 255, 0);
}
public void setColorMaroon() {
shapeColor = new Color(128,0, 0);
}
public void setColorNavy() {
shapeColor = new Color(0, 0, 128);
}
public void setColorOlive() {
shapeColor = new Color(128, 128, 0);
}
public void setColorPurple() {
shapeColor = new Color(128, 0, 128);
}
public void setColorRed() {
shapeColor = new Color(255, 0, 0);
}
public void setColorSilver() {
shapeColor = new Color(192, 192, 192);
}
public void setColorTeal() {
shapeColor = new Color(0, 128, 128);
}
public void setColorWhite() {
shapeColor = new Color(255, 255, 255);
}
public void setColorYellow() {
shapeColor = new Color(255, 255, 0);
}
}