东北大学-java课程作业-Paint.zip

/* 可以绘制图案的区域 */ import java.awt.*; import java.awt.event.*; import java.awt.image.BufferedImage; import java.io.*; import java.util.*; import javax.swing.*; public class PaintPanel extends JComponent implements Serializable { private ArrayList<Shape> shapes; private Shape currentShape; private String currentText; private Stack<Operation> operationStack; private Stack<Operation> redoStack; public enum tools {OVAL, RECTANGLE, LINE, SEGMENT, SELECT, TEXT}//0 圆形 1 方形 2 自由画线 3 橡皮 4 选择 5 线段 public enum cursors {DEFAULT, CROSS, MOVE}// 0 普通鼠标 1 十字架 2 移动 private Font font; private tools tool; private Color fore; private float stroke; private cursors cursor; private int x1 = 0; private int y1 = 0; private boolean fill; private boolean delete; private boolean saved; public PaintPanel() { tool = tools.OVAL; fill = false; stroke = 3.0f; fore = Color.BLACK; font = new Font("黑体", 0, 20); shapes = new ArrayList<>(); currentShape = null; currentText = null; operationStack = new Stack<>(); redoStack = new Stack<>(); addMouseListener(new MouseHandler()); addMouseMotionListener(new MouseMotionHandler()); setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR)); cursor = cursors.CROSS; saved = false; } public boolean isSaved() { return saved; } public void setTool(tools t) { this.tool = t; } public void setCurrentText(String t) { this.currentText = t; } public void setStroke(float stroke) { this.stroke = stroke; } public void setFore(Color fore) { this.fore = fore; } public void setFont(Font font) { this.font = font; } public Color getFore() { return fore; } public void setFill(boolean isFilled) {this.fill = isFilled;} public void setDelete(boolean del) {this.delete = del;} /**ArrayList * 将存储的所有图形绘制出来 */ @Override public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g; for (Shape s : shapes) { s.draw(g2); } } public void undo() { saved = false; if(!operationStack.empty()) { Operation o = operationStack.pop(); o.undo(); redoStack.push(o); repaint(); } } public void redo() { saved = false; if(!redoStack.empty()) { Operation o = redoStack.pop(); o.redo(); operationStack.push(o); repaint(); } } /** * 查找坐标(x,y)处是否有图形，如有，返回这个图形，否则返回null */ private Shape find(int x, int y) { for (Shape r : shapes) { if (r.contain(x, y) && !r.isDeleted) return r; } return null; } /** * 将目前的内容画到一个BufferedImage中并返回 */ public BufferedImage getImage () { saved = true; BufferedImage image = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB); Graphics2D graphics2d = image.createGraphics(); graphics2d.fillRect(0,0, image.getWidth(), image.getHeight()); paint(graphics2d); return image; } /** * 清除所存的所有图形信息并重绘 */ public void clear () { saved = false; shapes.clear(); operationStack.clear(); redoStack.clear(); repaint(); } /** * 将目前的图形信息保存到一个文件中 */ public void writeImage (File file) { saved = true; try { FileOutputStream fos = new FileOutputStream(file); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(shapes); oos.flush(); oos.close(); fos.close(); } catch (IOException exce) { JOptionPane.showMessageDialog(this, "保存出错"); exce.printStackTrace(); } } /** * 从一个文件中读取图形信息，将其保存到程序中并重绘 */ public void readImage (File file) { saved = false; try { FileInputStream fis = new FileInputStream(file); ObjectInputStream ois = new ObjectInputStream(fis); shapes = (ArrayList<Shape>) ois.readObject(); repaint(); ois.close(); fis.close(); } catch (IOException exce) { JOptionPane.showMessageDialog(this, "打开出错"); exce.printStackTrace(); } catch (ClassNotFoundException exce) { exce.printStackTrace(); } } private class MouseHandler extends MouseAdapter { private int pressX; private int pressY; private int releasedX; private int releasedY; /** * 鼠标点击时执行的操作 */ public void mousePressed(MouseEvent mouseEvent) { switch (tool) { case OVAL: saved = false; currentShape = new Oval(fore, mouseEvent.getX(), mouseEvent.getY(), stroke, fill); shapes.add(currentShape); redoStack.clear(); operationStack.push(new Operation(Operation.Type.ADD, currentShape)); break; case RECTANGLE: saved = false; currentShape = new Rectangle(fore, mouseEvent.getX(), mouseEvent.getY(), stroke, fill); shapes.add(currentShape); redoStack.clear(); operationStack.push(new Operation(Operation.Type.ADD, currentShape)); break; case LINE: saved = false; pressX = x1 = mouseEvent.getX(); pressY = y1 = mouseEvent.getY(); currentShape = new LineSet(fore, mouseEvent.getX(), mouseEvent.getY(), stroke); shapes.add(currentShape); redoStack.clear(); operationStack.push(new Operation(Operation.Type.ADD, currentShape)); break; case SELECT: pressX = x1 = mouseEvent.getX(); pressY = y1 = mouseEvent.getY(); if (cursor == cursors.MOVE) { currentShape = find(mouseEvent.getX(), mouseEvent.getY()); if(delete) { saved = false; assert currentShape != null; currentShape.setDeleted(true); redoStack.clear(); operationStack.push(new Operation(Operation.Type.DEL, currentShape)); } } break; case SEGMENT: saved = false; currentShape = new Line(fore, mouseEvent.getX(), mouseEvent.getY(), stroke); shapes.add(currentShape); redoStack.clear(); operationStack.push(new Operation(Operation.Type.ADD, currentShape)); break; case TEXT: saved = false; if(currentText == null) break; currentShape = new Text(fore, mouseEvent.getX(), mouseEvent.getY(), currentText, font); shapes.add(currentShape); redoStack.clear(); operationStack.push(new Operation(Operation.Type.ADD, currentShape)); break; default: break;