我有一系列形状(大约50个),每个形状都有5个点和颜色(带alpha透明度)。我想将这些形状渲染到像素网格上。
我是一个业余程序员,所以不知道该如何做。
有人能给我一个起点或伪代码吗?
提前感谢。
我有一系列形状(大约50个),每个形状都有5个点和颜色(带alpha透明度)。我想将这些形状渲染到像素网格上。
我是一个业余程序员,所以不知道该如何做。
有人能给我一个起点或伪代码吗?
提前感谢。
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.List;
import java.util.ArrayList;
import java.awt.Point;
import javax.swing.JFrame;
import java.awt.Color;
import java.util.Random;
import java.awt.Polygon;
import java.awt.Shape;
public class GraphicsTest extends JFrame {
private List<ColoredShape> shapes;
private static final int NUM_SHAPES = 50;
private static final int NUM_POINTS_PER_SHAPE = 5;
private static final int WIDTH = 640;
private static final int HEIGHT = 480;
private Random randomGenerator;
public GraphicsTest(String title) {
super(title);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(WIDTH, HEIGHT);
randomGenerator = new Random();
initShapes();
}
private void initShapes() {
shapes = new ArrayList<ColoredShape>(NUM_SHAPES);
for (int i = 0; i < NUM_SHAPES; i++) {
Point[] points = getRandomPoints();
Color color = getRandomColor();
shapes.add(i, new ColoredShape(points, color));
}
}
private Point[] getRandomPoints() {
Point[] points = new Point[NUM_POINTS_PER_SHAPE];
for (int i = 0; i < points.length; i++) {
int x = randomGenerator.nextInt(WIDTH);
int y = randomGenerator.nextInt(HEIGHT);
points[i] = new Point(x, y);
}
return points;
}
/**
* @return a Color with random values for alpha, red, green, and blue values
*/
private Color getRandomColor() {
float alpha = randomGenerator.nextFloat();
float red = randomGenerator.nextFloat();
float green = randomGenerator.nextFloat();
float blue = randomGenerator.nextFloat();
return new Color(red, green, blue, alpha);
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
for (ColoredShape shape : shapes) {
g2.setColor(shape.getColor());
g2.fill(shape.getOutline());
}
}
public static void main(String[] args) {
GraphicsTest b = new GraphicsTest("Testing polygons");
}
private class ColoredShape {
private Polygon outline;
private Color color;
public ColoredShape(Point[] points, Color color) {
this.color = color;
// Would be better to separate out into xpoints, ypoints, npoints
// but I'm lazy
outline = new Polygon();
for (Point p : points) {
outline.addPoint((int) p.getX(), (int) p.getY());
}
}
public Color getColor() {
return color;
}
public Shape getOutline() { return outline; }
}
}
Java内置了一个相当不错的2D图形API。建议您查看http://java.sun.com/docs/books/tutorial/2d/index.html,以便了解基础知识。