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[英]Navigate through & display each database record in the 'textfield' using an AWT button
[英]AWT Label/Button/Textfield + paint?
如何在標簽/按鈕下方繪制? -Java
我想為ax ^ 2 + bx + c編寫一個坐標計算程序,但這並不是重點。
我只想通過AWT和paint方法繪制圖形。 (尚未實現),但是我無法在前台設置paint方法。 您能幫我解決問題,使油漆至少可見嗎?
我附上了我的想法綱要。 對不起,我的英語不好
import java.awt.Button;
import java.awt.Canvas;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextField;
public class MyWindow extends Frame {
Frame frame;
Label l1;
Label l2;
Label l3;
Button b1;
TextField t1;
TextField t2;
TextField t3;
Panel panel;
Canvas canvas;
MyWindow() {
frame = new Frame("GraphPlotter");
frame.setSize(800, 800);
frame.setLayout(new FlowLayout());
l1 = new Label("f(x)= ");
l2 = new Label(" x^2 + ");
l3 = new Label(" x + ");
t1 = new TextField("1");
t2 = new TextField("2");
t3 = new TextField("3");
b1 = new Button("Plot");
frame.add(l1);
frame.add(t1);
frame.add(l2);
frame.add(t2);
frame.add(l3);
frame.add(t3);
frame.add(b1);
frame.setVisible(true);
}
public void paint(Graphics g) {
g.fillRect(10, 10, 300, 300); // ist im "Hintergrund"??
}
}
` public class Start {
public static void main(String[] args) {
MyWindow window = new MyWindow();
}
}
`
您之前沒有設置顏色
g.fillRect(10, 10, 300, 300);
我大約兩個月左右就解決了這個問題,但此刻我有點動力,所以我將自己回答問題。 信息:repaint()調用paint,因此您不必自己實現此方法。
在任務中,我忘記了:
問題僅在於如何繪制,在閱讀以下代碼后應該很清楚:
package delete;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextField;
public class AwtFrame extends Frame {
AwtCanvas c;
Panel p1;
Label la_ax2, la_bx, la_c;
TextField tf_Ax2, tf_bx, tf_c;
public AwtFrame() {
super("paint example.");
this.setSize(800, 800);
initComp();
addComp();
// TODO: write a graph drawing method
c.repaint(); // paints a line of your graph
this.setVisible(true);
}
public void initComp() {
p1 = new Panel();
la_ax2 = new Label("x^2 ");
la_bx = new Label("+ x ");
la_c = new Label("+ c ");
tf_Ax2 = new TextField(0);
tf_bx = new TextField(0);
tf_c = new TextField(0);
c = new AwtCanvas();
}
public void addComp() {
this.setLayout(new BorderLayout());
p1.setLayout(new FlowLayout());
this.add(p1, BorderLayout.NORTH);
this.add(c, BorderLayout.CENTER);
p1.add(tf_Ax2);
p1.add(la_ax2);
p1.add(tf_bx);
p1.add(la_bx);
p1.add(tf_c);
p1.add(la_c);
}
public static void main(String[] args) {
new AwtFrame();
}
}
package delete;
import java.awt.Canvas;
import java.awt.Graphics;
import java.util.LinkedList;
public class AwtCanvas extends Canvas {
// LinkedList<ToImplement> coords = new LinkedList<ToImplement>();
// TODO: implement plotter
public void paint(Graphics g) {
g.drawLine(40, 40, 100, 100);
g.drawLine(54, 22, 300, 200);
}
}
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