绘图程序

package 绘图程序;

public interface Shape {
    public void Draw();
}

package 绘图程序;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Shell;

public class Rect implements Shape {
    private int top;
    private int left;
    private int width;
    private int height;
    private GC gcMain;
    private int size;
    private Color color;
    public Rect(int top, int left, int width, int height,int size,Color color, GC gc){
        this.top = top;
        this.left = left;
        this.width = width;
        this.height = height;
        this.gcMain = gc;
        this.size = size;
        this.color = color;
        
    }
    @Override
    public void Draw() {
        gcMain.setLineWidth(size);
        gcMain.setForeground(color);
        gcMain.drawRectangle(top, left, width, height);
    }

}

package 绘图程序;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.graphics.GC;

public class Circle implements Shape {
    private int top;
    private int left;
    private int width;
    private int height;
    private GC gcMain;
    private int size;
    private Color color; 
    public Circle(int top, int left, int width, int height,int size,Color color, GC gc){
        this.top = top;
        this.left = left;
        this.width = width;
        this.height = height;
        this.gcMain = gc;
        this.size = size;
        this.color = color; 
    }
    
    @Override
    public void Draw() {
        gcMain.setLineWidth(size);
        gcMain.setForeground(color);
        gcMain.drawOval(top, left, width, height);
    }
}

package 绘图程序;


import java.util.ArrayList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Shell;

public class Board {
    private Shell shell;
    private List<Shape> shapes;
    
    public Board(Shell shell){
        shapes = new ArrayList<Shape>();
        this.shell = shell;
    }
    public List getList()
    {
        return shapes;
    }
    public void InsertShape(Shape shape){
        shapes.add(shape);
    }
    
    public void Refresh(){
        for (Shape shape : shapes) {
            shape.Draw();
        }
    }
}

package 绘图程序;

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import org.eclipse.swt.SWT;

import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Spinner;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Combo;

public class Tt {

private static GC gcMain = null;
private static int startX = 0;
private static int startY = 0;
private static boolean leftButtonDown = false;
private static int lastWidth = 0;
private static int lastHeight = 0;
private static String selectshape = "Circle";
private static int size = 0;
private static Display display = Display.getDefault();
private static Shell shell = new Shell();
private static Board board = new Board(shell);
private static Color color = shell.getBackground();
private static String selectcolor = null;

public static Color getColor() {
return color;
}

public static void setColor(Color color) {
Tt.color = color;
}

public static String getSelectcolor() {
return selectcolor;
}

public static void setSelectcolor(String selectcolor) {
Tt.selectcolor = selectcolor;
}

public static void main(String[] args) {
shell.setToolTipText("");

shell.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent arg0) {
board.Refresh();
}
});

gcMain = new GC(shell);
shell.addMouseMoveListener(new MouseMoveListener() {
public void mouseMove(MouseEvent arg0) {
if (leftButtonDown) {
gcMain.setLineStyle(SWT.LINE_DOT);
gcMain.setForeground(shell.getBackground());
// gcMain.setForeground(display.getSystemColor(SWT.COLOR_GREEN));
gcMain.drawRectangle(startX, startY, lastWidth, lastHeight);
gcMain.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
gcMain.drawRectangle(startX, startY, arg0.x - startX, arg0.y - startY);
lastWidth = arg0.x - startX;
lastHeight = arg0.y - startY;
gcMain.setLineStyle(SWT.LINE_SOLID);
}
}
});
shell.addMouseListener(new MouseAdapter() {
@Override
public void mouseUp(MouseEvent e) {
if (e.button == 1) {
leftButtonDown = false;
lastWidth = e.x - startX;
lastHeight = e.y - startY;

// gcMain.setLineStyle(SWT.LINE_DOT); //线框虚线
gcMain.setForeground(shell.getBackground());

gcMain.drawRectangle(startX, startY, lastWidth, lastHeight);
gcMain.setLineStyle(SWT.LINE_SOLID);//线框实线

gcMain.setForeground(color);
if (selectshape == "Rect") {
Rect rect = new Rect(startX, startY, lastWidth, lastHeight, size, color, gcMain);
// gcMain.setForeground(display.getSystemColor(SWT.COLOR_RED));
gcMain.setLineWidth(size);
board.InsertShape(rect);
} else {

Circle circle = new Circle(startX, startY, lastWidth, lastHeight, size, color, gcMain);
board.InsertShape(circle);
gcMain.setLineWidth(size);
}
board.Refresh();
}
}

@Override
public void mouseDown(MouseEvent e) {
if (e.button == 1) {
leftButtonDown = true;
startX = e.x;
startY = e.y;
}

}
});
shell.setSize(800, 600);
shell.setText("MyDraw");
shell.setLayout(null);

Button Rect = new Button(shell, SWT.NONE);
Rect.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
selectshape = "Rect";
}
});
Rect.setBounds(100, 100, 150, 50);
Rect.setText("Rect");

Button Circle = new Button(shell, SWT.NONE);
Circle.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
selectshape = "Circle";
}
});
Circle.setBounds(300, 100, 150, 50);
Circle.setText("Circle");

Button bt1 = new Button(shell, SWT.NONE);
bt1.setSelection(true);
bt1.setBounds(100, 173, 150, 50);
bt1.setText("粗");
bt1.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
size = 5;
}
});
Button bt2 = new Button(shell, SWT.NONE);
bt2.setSelection(true);
bt2.setBounds(300, 173, 150, 50);
bt2.setText("细");
bt2.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
size = 2;
}
});


Combo combo = new Combo(shell, SWT.NONE);
combo.setBounds(514, 100, 137, 50);
combo.removeAll();
combo.setText("Color");
combo.add("黄");combo.add("红");combo.add("绿");combo.add("蓝");
combo.addSelectionListener( new SelectionListener(){

@Override
public void widgetSelected(SelectionEvent e) {
selectcolor = combo.getText();
switch (selectcolor)
{
case "黄" : color = display.getSystemColor(SWT.COLOR_YELLOW);break;
case "红" : color = display.getSystemColor(SWT.COLOR_RED);break;
case "绿" : color = display.getSystemColor(SWT.COLOR_GREEN);break;
case "蓝" : color = display.getSystemColor(SWT.COLOR_BLUE);break;
}
}

/// 缺省 默认值
@Override
public void widgetDefaultSelected(SelectionEvent arg0) {
// TODO Auto-generated method stub

}
}

);

shell.open();
shell.layout();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
}