Hello Friends Today I am going to show you how to create simple Sketch Pad in Java. This is not an advance tool or application but a simple tool, you can take idea from it and you can develop your own sketching tool in Java. Here is the code to show you the use of Frame class and some useful action listeners i.e, ActionListener, WindowListener, MouseListener, MouseMotionListener, ItemListener.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 |
import java.awt.event.*; import java.awt.*; public class SketchPad extends Frame implements ActionListener, WindowListener, MouseListener, MouseMotionListener, ItemListener { String selectedShape = new String("Square"); String selectedColor = new String("Blue"); boolean Eraser = false; int upLX, upLY, W, H, selX1, selY1, selX2, selY2; String[] extrasList = {"Clear Canvas", "Eraser"}; String[] colorList = {"Black", "Cyan", "Green", "Yellow", "Magenta", "Red", "Blue"}; String[] shapeList = {"Line", "Rectangle", "Square", "Circle"}; @Override //from WindowListener public void windowClosing(WindowEvent eve) { System.exit(0); } @Override //from WindowListener public void windowActivated(WindowEvent we) { } @Override //from WindowListener public void windowOpened(WindowEvent we) { } @Override //from WindowListener public void windowIconified(WindowEvent we) { } @Override //from WindowListener public void windowClosed(WindowEvent we) { } @Override //from WindowListener public void windowDeactivated(WindowEvent we) { } @Override //from WindowListener public void windowDeiconified(WindowEvent we) { } @Override //from MouseMotionListener public void mouseMoved(MouseEvent me) { } @Override //from MouseListener public void mouseClicked(MouseEvent me) { } @Override //from MouseListener public void mouseExited(MouseEvent me) { } @Override //from MouseListener public void mouseEntered(MouseEvent me) { } @Override //from ItemListener public void itemStateChanged(ItemEvent ie) { } public SketchPad(String title) { super(title); addMouseMotionListener(this); addWindowListener(this); addMouseListener(this); setLayout(null); setMenuItems(); setBackground(Color.white); } @Override //from ActionListener public void actionPerformed(ActionEvent ape) { Graphics ga = getGraphics(); Object s = ape.getActionCommand(); for (int i = 0; i != colorList.length; i++) { if (s.equals(colorList[i])) { selectedColor = colorList[i]; return; } } for (int i = 0; i != shapeList.length; i++) { if (s.equals(shapeList[i])) { selectedShape = shapeList[i]; return; } } if (s.equals("Eraser")) { Eraser = true; return; } else if (s.equals("Clear Canvas")) { ga.clearRect(0, 0, 700, 700); return; } } void chooseColor(Graphics ga) { for (int i = 0; i != colorList.length; i++) { if (selectedColor.equals(colorList[i])) { switch (i) { case 0: ga.setColor(Color.black); break; case 1: ga.setColor(Color.cyan); break; case 2: ga.setColor(Color.green); break; case 3: ga.setColor(Color.yellow); break; case 4: ga.setColor(Color.magenta); break; case 5: ga.setColor(Color.red); break; case 6: ga.setColor(Color.blue); } } } } @Override //from MouseListener public void mouseReleased(MouseEvent me) { Graphics ga = getGraphics(); if (Eraser) { Eraser = false; return; } chooseColor(ga); selX2 = me.getX(); selY2 = me.getY(); if (selectedShape.equals("Line")) { ga.drawLine(selX1, selY1, selX2, selY2); } else if (selectedShape.equals("Circle")) { drawSelectedShape(ga, "Circle"); } else if (selectedShape.equals("Square")) { drawSelectedShape(ga, "Square"); } else if (selectedShape.equals("Rectangle")) { drawSelectedShape(ga, "Rectangle"); } ga.setColor(Color.yellow); ga.drawString(".", selX1, selY1); ga.setColor(Color.black); } void drawSelectedShape(Graphics ga, String sel_shape) { upLX = Math.min(selX1, selX2); upLY = Math.min(selY1, selY2); W = Math.abs(selX1 - selX2); H = Math.abs(selY1 - selY2); if (sel_shape.equals("Square")) { ga.fillRect(upLX, upLY, W, W); } else if (sel_shape.equals("Rectangle")) { ga.fillRect(upLX, upLY, W, H); } else if (sel_shape.equals("Circle")) { ga.fillOval(upLX, upLY, W, W); } } @Override //from MouseMotionListener public void mouseDragged(MouseEvent me) { Graphics ga = getGraphics(); selX2 = me.getX(); selY2 = me.getY(); if (Eraser) { ga.setColor(Color.white); ga.fillRect(selX2, selY2, 10, 10); } } @Override //from MouseListener public void mousePressed(MouseEvent me) { if (Eraser) { return; } upLX = 0; upLY = 0; W = 0; H = 0; selX1 = me.getX(); selY1 = me.getY(); Graphics ga = getGraphics(); ga.drawString(".", selX1, selY1); } void setMenuItems() { MenuBar mBar = new MenuBar(); Menu menuShape = new Menu("Shape"); for (int i = 0; i != shapeList.length; i++) { menuShape.add(shapeList[i]); } mBar.add(menuShape); menuShape.addActionListener(this); Menu menuColor = new Menu("Colors"); for (int i = 0; i != colorList.length; i++) { menuColor.add(colorList[i]); } mBar.add(menuColor); menuColor.addActionListener(this); Menu menuExtras = new Menu("Extras"); for (int i = 0; i != extrasList.length; i++) { menuExtras.add(extrasList[i]); } mBar.add(menuExtras); menuExtras.addActionListener(this); setMenuBar(mBar); } //main method menuExtrasecution starts here public static void main(String[] args) { SketchPad sp = new SketchPad("Sketchpad in Java"); sp.setSize(700, 700); sp.setVisible(true); } } |
Output/Screen Shot
Download Code
Sketch Pad in Java
1 file(s) 6.59 KB
Thanks
Please share if you like
Comments