我正在尝试构建 Paint 应用程序,并且在DrawingArea类中做错了什么。问题是当我尝试绘制第二个形状时,第一个形状或图形是自动删除的,因此我需要一些解决方法的想法。所有答案都可以接受。感谢帮助。
有部分 DrawingArea.class 代码:
@Override // GETTING FIRST (STARTING) COORDINATE WHEN THE MOUSE PRESSED public void mousePressed(MouseEvent e) { oldX = e.getX(); oldY = e.getY(); repaint(); } @Override // GETTING RELEASED COORDINATE TO DRAW LINE. public void mouseReleased(MouseEvent e) { lastX = e.getX(); lastY = e.getY(); repaint(); } public void mouseClicked(MouseEvent e) { clickedX = true; COUNT = e.getClickCount(); } // GETTING COORDINATE TO DRAW FILLEDRECT,FILLEDOVAL,OVAL,RECT. public void mouseDragged(MouseEvent e) { draggedX = e.getX(); draggedY = e.getY(); repaint(); width = Math.abs(oldX - draggedX); height = Math.abs(oldY - draggedY); x = Math.min(draggedX, oldX); y = Math.min(draggedY, oldY); } public void mouseMoved(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } // CLEAR THE ALL SHAPES DRAWED ON DRAW AREA. public void clear() { g2.setColor(Color.WHITE); g2.fillRect(0, 0, (int) this.getWidth() + 55, (int) this.getHeight() + 55); super.repaint(); } protected void paintComponent(Graphics g) { super.paintComponent(g); if (image == null) { image = new BufferedImage((int) this.getWidth(), (int) this.getHeight(), BufferedImage.TYPE_INT_ARGB); g2 = (Graphics2D) image.getGraphics(); g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); clear(); } g2.drawImage(image, 0, 0, getWidth(), getHeight(), this); g2.dispose(); g.setColor(initialColor); if (shape == Shapers.PENCIL) { g.setColor(currentColor); g.fillOval(draggedX, draggedY, thickness, thickness); } else if (shape == Shapers.OVAL) { g.setColor(currentColor); g.drawOval(oldX, oldY, draggedX, draggedX); } else if (shape == Shapers.FILLEDOVAL) { g.setColor(currentColor); g.fillOval(oldX, oldY, draggedX, draggedY); } else if (shape == Shapers.RECT) { g.setColor(currentColor); g.drawRect(x, y, width, height); } else if (shape == Shapers.FILLEDRECT) { g.setColor(currentColor); g.fillRect(x, y, width, height); } else if (shape == Shapers.LINE) { g.setColor(currentColor); g.drawLine(oldX, oldY, draggedX, draggedY); oldX = draggedX; oldY = draggedY; } else if (shape == Shapers.ERASER) { g.setColor(Color.WHITE); g.fillRect(draggedX, draggedY, thickness, thickness); } else if (shape == Shapers.TEXT) { if (clickedX == true || COUNT == 2) { String str = JOptionPane.showInputDialog("Write Your Text Here : "); g.setFont(myFont); g.setColor(currentColor); if (str != null) { g.drawString(str, oldX, oldY); COUNT = 0; } else { return; } } } else { COUNT = 0; return; } } }
您需要:
查看“ 自定义绘画方法”以找到这两种方法的工作示例,并使用最能满足您要求的方法。