java圓和矩形繪圖代碼 java畫一個圓

求一個java程序：繪圖程序包括畫圓，橢圓，線，矩形，自定義。并且可以調圖形顏色！

public?enum?ShapeTypes?{

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LINE,?CIRCLE,?RECTANGLE

}

public?interface?Shape?{

void?paint(Graphics?g);

}

public?class?Rectangle?implements?Shape?{

//?矩形左上角的坐標

private?int?x,?y;

//?矩形的寬度和高度

private?int?width,?height;

private?Color?rectangleColor;

public?Rectangle()?{

super();

}

public?Rectangle(int?x,?int?y,?int?width,?int?height,?Color?rectangleColor)?{

super();

this.x?=?x;

this.y?=?y;

this.width?=?width;

this.height?=?height;

this.rectangleColor?=?rectangleColor;

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(rectangleColor);

g.drawRect(x,?y,?width,?height);

}

public?class?Line?implements?Shape?{

//?直線的起始位置

private?int?x1,?y1;

//?直線的終止位置

private?int?x2,?y2;

private?Color?lineColor;

public?Line(int?x1,?int?y1,?int?x2,?int?y2,?Color?lineColor)?{

super();

this.x1?=?x1;

this.y1?=?y1;

this.x2?=?x2;

this.y2?=?y2;

this.lineColor?=?lineColor;

}

public?Line()?{

super();

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(lineColor);

g.drawLine(x1,?y1,?x2,?y2);

}

public?class?Circle?implements?Shape?{

//?圓的顏色

private?Color?circleColor;

//?圓心的坐標

private?int?x,?y;

//?圓的半徑

private?int?radius;

public?Circle()?{

super();

}

public?Circle(int?x,?int?y,?int?radius,?Color?circleColor)?{

super();

this.circleColor?=?circleColor;

this.x?=?x;

this.y?=?y;

this.radius?=?radius;

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(circleColor);

//?畫弧,?當弧的寬度和高度一致且從0~360度時就是原形了

g.drawArc(x,?y,?radius,?radius,?0,?360);

}

public?class?SketchpadPanel?extends?Canvas?implements?MouseListener,?MouseMotionListener?{

private?static?final?long?serialVersionUID?=?-5229161042153132522L;

//?鼠標點擊起始坐標和當前坐標

private?int?beginX?=?0,?beginY?=?0,?currentX?=?0,?currentY?=?0;

//?判斷鼠標是否被按下

private?boolean?isMousePressing?=?false;

//?保存當前的圖形,?在撤銷和恢復時使用

private?final?StackShape?currentShapes?=?new?StackShape();

//?保存已經刪除過的圖形

private?final?StackShape?deletedShapes?=?new?StackShape();

private?ShapeTypes?type;

private?Color?color;

public?SketchpadPanel()?{

addMouseListener(this);

addMouseMotionListener(this);

}

/**

?*?撤銷方法

?*/

public?void?undo()?{

if?(currentShapes.size()??0)?{

//?從所有保存過的圖形中取出最后一個,?放入到已刪除的圖形中去

Shape?shape?=?currentShapes.pop();

deletedShapes.push(shape);

repaint();

}

/**

?*?恢復撤銷方法

?*/

public?void?redo()?{

if?(deletedShapes.size()??0)?{

//?從所有刪除的圖形中取出最后一個,?放入保存的圖形中

Shape?shape?=?deletedShapes.pop();

currentShapes.push(shape);

repaint();

}

/**

?*?設置命令

?*?

?*?@param?type

?*/

public?void?setShapeType(ShapeTypes?type)?{

this.type?=?type;

}

/**

?*?設置顏色

?*?

?*?@param?color

?*/

public?void?setColor(Color?color)?{

this.color?=?color;

}

public?void?updete(Graphics?g)?{

paint(g);

}

/**

?*?繪制畫板

?*/

@Override

public?void?paint(Graphics?g)?{

//?繪制畫板

Dimension?size?=?getSize();

int?width?=?size.width;

int?height?=?size.height;

g.setColor(Color.WHITE);

g.fillRect(0,?0,?width,?height);

//?繪制所有圖形

Shape?shape?=?null;

EnumerationShape?e?=?currentShapes.elements();

while?(e.hasMoreElements())?{

shape?=?e.nextElement();

shape.paint(g);

}

//?如果當前鼠標沒有釋放

if?(isMousePressing)?{

g.setColor(color);

switch?(type)?{

//?繪制直線

case?LINE:

g.drawLine(beginX,?beginY,?currentX,?currentY);

break;

//?繪制矩形

case?RECTANGLE:

if?(currentX??beginX)?{

if?(currentY??beginY)?{

//?如果當前位置在起始位置的左上方,?則以鼠標當前位置為矩形的左上角位置

g.drawRect(currentX,?currentY,?beginX?-?currentX,?beginY?-?currentY);

}?else?{

//?如果當前位置在起始位置的左下方,?則以鼠標當前位置的橫坐標和起始位置的縱坐標作為矩形的左上角位置

g.drawRect(currentX,?beginY,?beginX?-?currentX,?currentY?-?beginY);

}

}?else?{

if?(currentY??beginY)?{

//?如果當前位置在起始位置的右上方,?則以鼠標起始位置的很坐標和當前位置的縱坐標作為矩形的左上角位置

g.drawRect(beginX,?currentY,?currentX?-?beginX,?beginY?-?currentY);

}?else?{

//?如果當前位置在起始位置的右下方,?則已起始位置作為矩形的左上叫位置

g.drawRect(beginX,?beginY,?currentX?-?beginX,?currentY?-?beginY);

}

break;

//?繪制圓形

case?CIRCLE:

//?半徑為a*a?+?b*b的平方根

int?radius?=?(int)?Math

.sqrt((beginX?-?currentX)?*?(beginX?-?currentX)?+?(beginY?-?currentY)?*?(beginY?-?currentY));

g.drawArc(beginX?-?radius?/?2,?beginY?-?radius?/?2,?radius,?radius,?0,?360);

break;

}

@Override

public?void?mouseClicked(MouseEvent?e)?{

}

@Override

public?void?mouseEntered(MouseEvent?e)?{

}

@Override

public?void?mouseExited(MouseEvent?e)?{

}

/**

?*?當鼠標按下的時候獲得起始坐標

?*/

@Override

public?void?mousePressed(MouseEvent?e)?{

beginX?=?e.getX();

beginY?=?e.getY();

isMousePressing?=?true;

}

/**

?*?當鼠標釋放時獲得當前坐標

?*/

@Override

public?void?mouseReleased(MouseEvent?e)?{

currentX?=?e.getX();

currentY?=?e.getY();

isMousePressing?=?false;

//?當釋放鼠標時,?將繪制的圖形保存到shapes中

switch?(type)?{

//?繪制直線

case?LINE:

Line?line?=?new?Line(beginX,?beginY,?currentX,?currentY,?color);

currentShapes.push(line);

break;

//?繪制圓形

case?CIRCLE:

//?半徑為a*a?+?b*b的平方根

int?radius?=?(int)?Math

.sqrt((beginX?-?currentX)?*?(beginX?-?currentX)?+?(beginY?-?currentY)?*?(beginY?-?currentY));

Circle?circle?=?new?Circle(beginX?-?radius?/?2,?beginY?-?radius?/?2,?radius,?color);

currentShapes.push(circle);

break;

//?繪制矩形

case?RECTANGLE:

Rectangle?rectangle?=?null;

if?(currentX??beginX)?{

if?(currentY??beginY)?{

rectangle?=?new?Rectangle(currentX,?currentY,?beginX?-?currentX,?beginY?-?currentY,?color);

}?else?{

rectangle?=?new?Rectangle(currentX,?beginY,?beginX?-?currentX,?currentY?-?beginY,?color);

}

}?else?{

if?(currentY??beginY)?{

rectangle?=?new?Rectangle(beginX,?currentY,?currentX?-?beginX,?beginY?-?currentY,?color);

}?else?{

rectangle?=?new?Rectangle(beginX,?beginY,?currentX?-?beginX,?currentY?-?beginY,?color);

}

currentShapes.push(rectangle);

break;

}

repaint();

}

@Override

public?void?mouseDragged(MouseEvent?e)?{

currentX?=?e.getX();

currentY?=?e.getY();

this.repaint();

}

@Override

public?void?mouseMoved(MouseEvent?e)?{

}

public?class?SketchpadFrame?extends?JFrame?{

private?static?final?long?serialVersionUID?=?-7080053971741609904L;

private?final?JPanel?commandPanel?=?new?JPanel();?//?存放命令的面板

private?final?JPanel?colorPanel?=?new?JPanel();?//?存放顏色的面板

private?final?JPanel?mainPanel?=?new?JPanel();?//?主面板

private?final?JButton?redButton?=?new?JButton("紅色");

private?final?JButton?blueButton?=?new?JButton("藍色");

private?final?JButton?greenButton?=?new?JButton("綠色");

private?final?JButton?lineButton?=?new?JButton("直線");

private?final?JButton?circleButton?=?new?JButton("圓");

private?final?JButton?rectangleButton?=?new?JButton("矩形");

private?final?JButton?undoButton?=?new?JButton("撤銷");

private?final?JButton?redoButton?=?new?JButton("恢復撤銷");

private?final?JButton?exitButton?=?new?JButton("退出");

SketchpadPanel?sketchPanel?=?new?SketchpadPanel();

private?void?initFrame()?{

commandPanel.setLayout(new?FlowLayout());

commandPanel.add(lineButton);

commandPanel.add(circleButton);

commandPanel.add(rectangleButton);

commandPanel.add(undoButton);

commandPanel.add(redoButton);

commandPanel.add(exitButton);

colorPanel.setLayout(new?FlowLayout());

colorPanel.add(redButton);

colorPanel.add(blueButton);

colorPanel.add(greenButton);

mainPanel.setLayout(new?BorderLayout());

mainPanel.add(commandPanel,?BorderLayout.NORTH);

mainPanel.add(colorPanel,?BorderLayout.CENTER);

getContentPane().add("South",?mainPanel);

getContentPane().add("Center",?sketchPanel);

//?初始化設置:顏色和命令

lineButton.setForeground(Color.RED);

sketchPanel.setColor(Color.RED);

redButton.setForeground(Color.RED);

sketchPanel.setShapeType(ShapeTypes.LINE);

}

private?void?initListener()?{

redButton.addActionListener(new?ActionListener()?{

@Override