Java如何使用Graphics2D制作抗锯齿线?
我试图用Graphics2D制作一个画板,在MouseMotionlistener方法mouseDragged中,我从两个点(起点和终点)绘制一条线,但每当我添加这条线时,它看起来都是锯齿状和粗糙的。我用它来帮助抗锯齿,但它似乎什么也没做Java如何使用Graphics2D制作抗锯齿线?,java,graphics,drawing,graphics2d,antialiasing,Java,Graphics,Drawing,Graphics2d,Antialiasing,我试图用Graphics2D制作一个画板,在MouseMotionlistener方法mouseDragged中,我从两个点(起点和终点)绘制一条线,但每当我添加这条线时,它看起来都是锯齿状和粗糙的。我用它来帮助抗锯齿,但它似乎什么也没做 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 但这对高冲程值没有任何帮助。 这是我画画的代码 public void mous
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
但这对高冲程值没有任何帮助。
这是我画画的代码
public void mouseDragged(MouseEvent e) {
//sets up graphics2d object
g2 = (Graphics2D)getGraphics();
g2.setStroke(new BasicStroke(strokeSize));
g2.setColor(color);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//draws line using points and shapes
endPoint = e.getPoint();
Shape line = new Line2D.Double(beginPoint, endPoint);
g2.draw(line);
beginPoint = endPoint;
beginPoint在mousePressed中有一个值有很多(非常酷的)渲染提示!我建议你开始尝试所有这些方法,看看什么组合能给你想要的结果
警告
g2=(Graphics2D)getGraphics()
是一个非常非常糟糕的主意,这不是定制绘画的工作原理
getGraphics
不过是上一次绘制过程中最后一次绘制内容的快照,在下一次绘制过程中将无效
我强烈建议大家通读一遍,更好地理解Swing中的绘画是如何工作的,以及你应该如何使用它
用鼠标画图是一个很常见的问题,有很多答案。我建议大家看看其他一些问题/答案,看看如何做到这一点,并根据自己的需要加以采纳
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
// Remember, graphics is a shared context, when you make changes
// to it, you should also undo them. To this end, we use create/dispose
// which takes a snapshot of the current state and restores it at the
// end.
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2.setColor(Color.BLACK);
g2.drawLine(0, 0, getWidth(), getHeight());
g2.drawLine(getWidth(), 0, 0, getHeight());
g2.dispose();
}
}
}