有没有人对任何用于绘制简单几何图形的lib /包有任何建议,例如三角形,方形?它可以保存为png格式。
答案 0 :(得分:8)
此源使用Java 2D API的Graphics2D
来绘制一些简单的彩色形状。
供参考,以下是产生的32x32图像。
{
{0}}
{{ 0}}
import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.*;
public class SimpleImages {
public static BufferedImage getColoredShapeImage(
int size, Shape shape, Color color) {
BufferedImage bi = new BufferedImage(
size, size, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = bi.createGraphics();
g.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g.setColor(color);
g.fill(shape);
g.dispose();
return bi;
}
public static Shape getPointedShape(int points, int radius) {
double angle = Math.PI * 2 / points;
GeneralPath p = new GeneralPath();
for (int ii = 0; ii < points; ii++) {
double a = angle * ii;
double x = (Math.cos(a) * radius) + radius;
double y = (Math.sin(a) * radius) + radius;
if (ii == 0) {
p.moveTo(x, y);
} else {
p.lineTo(x, y);
}
}
p.closePath();
return p;
}
public static void main(String[] args) throws Exception {
Color[] colors = {
Color.RED,
Color.GREEN,
Color.BLUE,
Color.YELLOW
};
File f = new File(System.getProperty("user.home"));
f = new File(f, "ShapedImages");
f.mkdirs();
for (Color c : colors) {
for (int s = 15; s < 31; s += 15) {
Shape sh = new Ellipse2D.Double(1, 1, 2 * s, 2 * s);
BufferedImage i = getColoredShapeImage((2 * s) + 2, sh, c);
String name = "Image"
+ "0point-"
+ s + "px-"
+ c.getRed() + "r-"
+ c.getGreen() + "g-"
+ c.getBlue() + "b"
+ ".png";
File t = new File(f, name);
ImageIO.write(i, "png", t);
for (int ii = 3; ii < 7; ii++) {
sh = getPointedShape(ii, s);
i = getColoredShapeImage((2 * s) + 2, sh, c);
name = "Image"
+ ii + "point-"
+ s + "px-"
+ c.getRed() + "r-"
+ c.getGreen() + "g-"
+ c.getBlue() + "b"
+ ".png";
t = new File(f, name);
ImageIO.write(i, "png", t);
}
}
}
Desktop.getDesktop().open(f);
}
}
GeometricShapeImages
/**
* Interface for accessing the images seen in
* http://stackoverflow.com/a/16052085/418556
*/
interface GeometricShapeImages {
public static final int BLUE = 0;
public static final int GREEN = 1;
public static final int RED = 2;
public static final int YELLOW = 3;
public static final int CIRCLE = 0;
public static final int TRIANGLE = 1;
public static final int DIAMOND = 2;
public static final int PENTAGON = 3;
public static final int HEXAGON = 4;
/**
* Stores a String representation of the URL for the colored shape image.
* Can be accessed like GeometricShapeImages.URL[DIAMOND][BLUE]
*/
public static final String[][] URL = {
{ // CIRCLE
"http://i.stack.imgur.com/gJmeJ.png", // BLUE
"http://i.stack.imgur.com/T5uTa.png", // GREEN
"http://i.stack.imgur.com/wCF8S.png", // RED
"http://i.stack.imgur.com/IHARa.png" // YELLOW
}, // END: CIRCLE
{ // TRIANGLE
"http://i.stack.imgur.com/L5DGx.png", // BLUE
"http://i.stack.imgur.com/gYxHm.png", // GREEN
"http://i.stack.imgur.com/5v2TX.png", // RED
"http://i.stack.imgur.com/8BGfi.png" // YELLOW
}, // END: TRIANGLE
{ // DIAMOND
"http://i.stack.imgur.com/in9g1.png", // BLUE
"http://i.stack.imgur.com/1lgtq.png", // GREEN
"http://i.stack.imgur.com/F0JHK.png", // RED
"http://i.stack.imgur.com/6ZXhi.png" // YELLOW
}, // END: DIAMOND
{ // PENTAGON
"http://i.stack.imgur.com/IucNt.png", // BLUE
"http://i.stack.imgur.com/yBOv3.png", // GREEN
"http://i.stack.imgur.com/4EVv1.png", // RED
"http://i.stack.imgur.com/Lqkl0.png" // YELLOW
}, // END: PENTAGON
{ // HEXAGON
"http://i.stack.imgur.com/yoKxT.png", // BLUE
"http://i.stack.imgur.com/zJ8am.png", // GREEN
"http://i.stack.imgur.com/xj49g.png", // RED
"http://i.stack.imgur.com/c67nr.png" // YELLOW
} // END: HEXAGON
};
}
答案 1 :(得分:3)
您需要查看Java 2D API: http://docs.oracle.com/javase/tutorial/2d/overview/index.html