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谁对java的图形技术比较熟悉的帮帮忙。
来源: 互联网 发布时间:2015-02-12
本文导语: 我目前在做一个画板,但是遇到了难题,不知道该如何对所画出来的封闭图形填充颜色,哪位给给方法,不甚感激。 | 你的圖形是復合形狀麼? 如果那樣就要用就要用到 java.awt.geom包的Area類...
我目前在做一个画板,但是遇到了难题,不知道该如何对所画出来的封闭图形填充颜色,哪位给给方法,不甚感激。
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你的圖形是復合形狀麼?
如果那樣就要用就要用到 java.awt.geom包的Area類和GenearlPath類
給你一個例子:
/*
* @(#)Pear.java 1.2 98/07/31
*/
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;
/*
* This applet renders a pear, using Constructive Area Geometry (CSG) methods,
* add, intersect, and subtract.
*/
public class Pear extends JFrame {
Ellipse2D.Double circle, oval, leaf, stem;
Area circ, ov, leaf1, leaf2, st1, st2;
public Pear() {
circle = new Ellipse2D.Double();
oval = new Ellipse2D.Double();
leaf = new Ellipse2D.Double();
stem = new Ellipse2D.Double();
circ = new Area(circle);
ov = new Area(oval);
leaf1 = new Area(leaf);
leaf2 = new Area(leaf);
st1 = new Area(stem);
st2 = new Area(stem);
setBackground(Color.white);
}
public void paint (Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
int w = d.width;
int h = d.height;
double ew = w/2;
double eh = h/2;
g2.setColor(Color.green);
// Creates the first leaf by filling the intersection of two Area objects created from an ellipse.
leaf.setFrame(ew-16, eh-29, 15.0, 15.0);
leaf1 = new Area(leaf);
leaf.setFrame(ew-14, eh-47, 30.0, 30.0);
leaf2 = new Area(leaf);
leaf1.intersect(leaf2);
g2.fill(leaf1);
// Creates the second leaf.
leaf.setFrame(ew+1, eh-29, 15.0, 15.0);
leaf1 = new Area(leaf);
leaf2.intersect(leaf1);
g2.fill(leaf2);
g2.setColor(Color.black);
// Creates the stem by filling the Area resulting from the subtraction of two Area objects created from an ellipse.
stem.setFrame(ew, eh-42, 40.0, 40.0);
st1 = new Area(stem);
stem.setFrame(ew+3, eh-47, 50.0, 50.0);
st2 = new Area(stem);
st1.subtract(st2);
g2.fill(st1);
g2.setColor(Color.yellow);
// Creates the pear itself by filling the Area resulting from the union of two Area objects created by two different ellipses.
circle.setFrame(ew-25, eh, 50.0, 50.0);
oval.setFrame(ew-19, eh-20, 40.0, 70.0);
circ = new Area(circle);
ov = new Area(oval);
circ.add(ov);
g2.fill(circ);
}
public static void main(String s[]) {
JFrame f = new Pear();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
f.pack();
f.setSize(new Dimension(150,200));
f.show();
}
public void Notify(){
repaint();
}
}
如果那樣就要用就要用到 java.awt.geom包的Area類和GenearlPath類
給你一個例子:
/*
* @(#)Pear.java 1.2 98/07/31
*/
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;
/*
* This applet renders a pear, using Constructive Area Geometry (CSG) methods,
* add, intersect, and subtract.
*/
public class Pear extends JFrame {
Ellipse2D.Double circle, oval, leaf, stem;
Area circ, ov, leaf1, leaf2, st1, st2;
public Pear() {
circle = new Ellipse2D.Double();
oval = new Ellipse2D.Double();
leaf = new Ellipse2D.Double();
stem = new Ellipse2D.Double();
circ = new Area(circle);
ov = new Area(oval);
leaf1 = new Area(leaf);
leaf2 = new Area(leaf);
st1 = new Area(stem);
st2 = new Area(stem);
setBackground(Color.white);
}
public void paint (Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
int w = d.width;
int h = d.height;
double ew = w/2;
double eh = h/2;
g2.setColor(Color.green);
// Creates the first leaf by filling the intersection of two Area objects created from an ellipse.
leaf.setFrame(ew-16, eh-29, 15.0, 15.0);
leaf1 = new Area(leaf);
leaf.setFrame(ew-14, eh-47, 30.0, 30.0);
leaf2 = new Area(leaf);
leaf1.intersect(leaf2);
g2.fill(leaf1);
// Creates the second leaf.
leaf.setFrame(ew+1, eh-29, 15.0, 15.0);
leaf1 = new Area(leaf);
leaf2.intersect(leaf1);
g2.fill(leaf2);
g2.setColor(Color.black);
// Creates the stem by filling the Area resulting from the subtraction of two Area objects created from an ellipse.
stem.setFrame(ew, eh-42, 40.0, 40.0);
st1 = new Area(stem);
stem.setFrame(ew+3, eh-47, 50.0, 50.0);
st2 = new Area(stem);
st1.subtract(st2);
g2.fill(st1);
g2.setColor(Color.yellow);
// Creates the pear itself by filling the Area resulting from the union of two Area objects created by two different ellipses.
circle.setFrame(ew-25, eh, 50.0, 50.0);
oval.setFrame(ew-19, eh-20, 40.0, 70.0);
circ = new Area(circle);
ov = new Area(oval);
circ.add(ov);
g2.fill(circ);
}
public static void main(String s[]) {
JFrame f = new Pear();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
f.pack();
f.setSize(new Dimension(150,200));
f.show();
}
public void Notify(){
repaint();
}
}