drawfigure.java

java语言实现的一个画图小程序,可以实现绘图

                y = e.getY(); //获得新位置
                g456.setColor(c); //设置色彩
                g456.setPaintMode(); //设置直接绘图模式
                g456.drawLine(sx, sy, x, y); //画最后的直线
                Lines lines = new Lines();                           //将所画直线存入栈中
                lines.setValue(sx, sy, x, y, c);
                stack.push(lines);
                saved=false;
                break;
            case 3: //画椭圆
            case 4: //画矩形
                g456.setXORMode(Color.white); //设置异或画图方式
                x0 = x > sx ? sx : x;
                y0 = y > sy ? sy : y; //计算上次的左上角坐标
                if (!fill) {
                    if (f == 3) {
                        g456.drawOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                    } else {
                        g456.drawRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                    }
                } else {
                    if (f == 3) {
                        g456.fillOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                    } else {
                        g456.fillRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                    }
                }
                g456.setPaintMode(); //设置异或画图方式
                x = e.getX();
                y = e.getY();
                x0 = x > sx ? sx : x;
                y0 = y > sy ? sy : y; //得到最后的左上角坐标
                g456.setColor(c);
                if (!fill) {
                    if (f == 3) {
                        g456.drawOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        Circle circle = new Circle();                            //将所画园存入栈中
                        circle.setValue(sx, sy, x, y, c,fill);
                        stack.push(circle);
                        saved=false;
                    } else {
                        g456.drawRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        Rectangle rectangle = new Rectangle();                   //将所画矩形存入栈中
                        rectangle.setValue(sx, sy, x, y, c, fill);
                        stack.push(rectangle);
                        saved=false;
                    }
                } else {
                    if (f == 3) {
                        g456.fillOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        Circle circle = new Circle();                               //将所画园存入栈中  
                        circle.setValue(sx, sy, x, y, c, fill);
                        stack.push(circle);
                        saved=false;
                    } else {
                        g456.fillRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        Rectangle rectangle = new Rectangle();                    //将所画矩形存入栈中
                        rectangle.setValue(sx, sy, x, y, c, fill);
                        stack.push(rectangle);
                        saved=false;
                    }
                }
                break;
        }
    }
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseClicked(MouseEvent e){}
public void mouseMoved(MouseEvent e){}
    public void mouseDragged(MouseEvent e) {
        int x0, y0;
        Graphics g123 = center.getGraphics();
        switch (f) {
            case 1: //任意绘图
                x = e.getX();
                y = e.getY();
                g123.setColor(c);                             
                g123.setPaintMode();
                g123.drawLine(sx, sy, x, y);
                Lines lines = new Lines();                       //将直线放入栈中。
                lines.setValue(sx, sy, x, y, c);
                stack.push(lines);
                saved=false;
                sx = x;
                sy = y;
                break;
            case 2: //绘制直线
                if (!flag) {
                    x = e.getX();
                    y = e.getY();
                    g123.setXORMode(Color.white);
                    g123.drawLine(sx, sy, x, y);
                    flag = true;
                } else {
                    g123.setXORMode(Color.white);
                    g123.drawLine(sx, sy, x, y);
                    x = e.getX();
                    y = e.getY();
                    g123.setXORMode(Color.white);
                    g123.drawLine(sx, sy, x, y);
                }
                break;
            case 3: //绘制圆
            case 4: //绘制矩形
                if (!flag) {
                    x = e.getX();
                    y = e.getY();
                    x0 = x > sx ? sx : x;
                    y0 = y > sy ? sy : y;
                    g123.setXORMode(Color.white);
                    if (!fill) {
                        if (f == 3) {
                            g123.drawOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        } else {
                            g123.drawRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        }
                    } else {
                        if (f == 3) {
                            g123.fillOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        } else {
                            g123.fillRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        }
                    }
                    flag = true;
                } else {
                    g123.setXORMode(Color.white);
                    x0 = x > sx ? sx : x;
                    y0 = y > sy ? sy : y;
                    if (!fill) {
                        if (f == 3) {
                            g123.drawOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        } else {
                            g123.drawRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        }
                    } else {
                        if (f == 3) {
                            g123.fillOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        } else {
                            g123.fillRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        }
                    }
                    x = e.getX();
                    y = e.getY();
                    x0 = x > sx ? sx : x;
                    y0 = y > sy ? sy : y;
                    if (!fill) {
                        if (f == 3) {
                            g123.drawOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        } else {
                            g123.drawRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        }
                    } else {
                        if (f == 3) {
                            g123.fillOval(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        } else {
                            g123.fillRect(x0, y0, Math.abs(x - sx), Math.abs(y - sy));
                        }
                    }
                }
                break;
        }
    }
public void actionPerformed(ActionEvent e){
f=Integer.parseInt(e.getActionCommand());
}
public void adjustmentValueChanged(AdjustmentEvent e){
c=new Color(r1.getValue(),g1.getValue(),b1.getValue());
tt.setBackground(c);
}
public void itemStateChanged(ItemEvent e){
if(e.getItemSelectable() instanceof JCheckBox){
JCheckBox temp=(JCheckBox)e.getItemSelectable();
fill=temp.isSelected();
}
else{
JRadioButton temp=(JRadioButton)e.getItemSelectable();
if(temp==op1)f=1;
else if(temp==op2)f=2;
else if(temp==op3)f=3;
else if(temp==op4)f=4;
}
}
public static void main(String args[]) {
JFrame.setDefaultLookAndFeelDecorated(true);
Font font = new Font("JFrame", Font.PLAIN, 14);
Enumeration keys = UIManager.getLookAndFeelDefaults().keys();  
while (keys.hasMoreElements()) {
Object key = keys.nextElement();
if (UIManager.get(key) instanceof Font)
UIManager.put(key, font);
}
DrawFigure mainFrame = new DrawFigure();                                 
}
}