我试图使用Graphics2D制作绘图板,在其中我从MouseMotionlistener方法mouseDragged中的两个点(起点和终点)绘制一条线,但是每当添加这条线时,它看起来实际上都是锯齿状且粗糙的。我用它来帮助抗锯齿,但似乎无能为力。
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
但是对于高笔画值没有任何帮助。 这是我的绘图代码。
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中被赋予一个值
答案 0 :(得分:1)
有很多(真的很酷)渲染提示!我建议您开始尝试所有这些,然后看看哪种组合可以为您带来预期的效果!
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();
}
}
}
g2 = (Graphics2D)getGraphics();
是一个非常非常糟糕的主意,而不是自定义绘画的工作原理。
getGraphics
只不过是上一次绘画过程中最后一次绘画的快照,并且在下一次绘画过程中将无效。
我强烈建议您通读Performing Custom Painting和Painting in AWT and Swing,以更好地了解Swing中的绘画工作原理以及您应该如何使用它。
用鼠标绘图不是一个常见的问题,并且有许多答案。我建议您看看其他一些问题/答案,以了解如何做到这一点并根据您的需要采用它们