菜鳥我知道可以利用JAVA的Graphics類的fillArc（）方法和drawOval（）方法畫出橢圓，在這兩種方法下能畫出四四方方的橢圓。但假如我要畫一個45度的橢圓呢？例如是像的畫法。
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SMILET
TA貢獻(xiàn)1796條經(jīng)驗(yàn) 獲得超4個贊
使用 AffineTransform 把Ellipse2D 旋轉(zhuǎn)一下就可以了。
import java.awt.image.BufferedImage;import java.awt.geom.AffineTransform;import java.awt.geom.Ellipse2D;import java.awt.Color;import java.awt.Shape;import java.awt.Graphics2D;import java.awt.RenderingHints;import java.io.File;import javax.imageio.ImageIO; public class DemoPNG { public static void main(String[] args) throws Exception { BufferedImage bi = new BufferedImage(600, 800, BufferedImage.TYPE_INT_ARGB); Graphics2D g2d = bi.createGraphics(); g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.setPaint(Color.WHITE); g2d.fillRect(0,0,600, 800); g2d.setPaint(Color.RED); Ellipse2D s1 = new Ellipse2D.Double(100, 100, 400, 600); g2d.draw(s1); AffineTransform transform = AffineTransform.getRotateInstance(Math.PI/4, 300, 400); Shape r1 = transform.createTransformedShape(s1); g2d.fill(r1); AffineTransform transform2 = AffineTransform.getRotateInstance(Math.PI/2, 300, 400); Shape r2 = transform2.createTransformedShape(s1); g2d.draw(r2); g2d.dispose(); ImageIO.write(bi, "PNG", new File("demo.png")); }} |
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