在Java中绘制矩形
问题描述:
我有这个代码,我有在整个画布上生成随机矩形。中心还有一个矩形。在Java中绘制矩形
当用户将鼠标悬停在画布上时,我需要在中心移动1个矩形。
这里是我的代码
package sample;
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import java.util.Random;
public class Main extends Application {
private static final int DRAW_WIDTH = 800;
private static final int DRAW_HEIGHT = 500;
private Animation myAnimation;
private Canvas canvas;
private GraphicsContext gtx;
@Override
public void start(Stage stage) throws Exception
{
stage.setTitle("tRIPPy BoXXX");
canvas = new Canvas(DRAW_WIDTH, DRAW_HEIGHT);
gtx = canvas.getGraphicsContext2D();
gtx.setLineWidth(3);
gtx.setFill(Color.BLACK);
gtx.fillRect(0, 0, DRAW_WIDTH, DRAW_HEIGHT);
VBox vBox = new VBox();
vBox.getChildren().addAll(canvas);
Scene scene = new Scene(vBox, DRAW_WIDTH, DRAW_HEIGHT);
stage.setScene(scene);
stage.show();
myAnimation = new Animation();
myAnimation.start();
}
class Animation extends AnimationTimer
{
@Override
public void handle(long now)
{
Random rand = new Random();
double red = rand.nextDouble();
double green = rand.nextDouble();
double blue = rand.nextDouble();
Color boxColor = Color.color(red,green,blue);
gtx.setStroke(boxColor);
....
这是我想与用户的鼠标四处移动框。我自己尝试了一些东西,但是我不能让代码保持它在代码中的方式。
.....
int rectX = 800/2;
int rectY = 500/2;
for (int side = 10; side <= 100; side += 10) {
gtx.strokeRect(rectX - side/2, rectY - side/2, side, side);
}
int centerX = (int)(Math.random()*800);
int centerY = (int)(Math.random()*800);
for (int side = (int)(Math.random()*100); side <= Math.random()* 100; side += Math.random()*100)
{
gtx.strokeRect(centerX - side/2, centerY - side/2, side, side);
}
}
}
public static void main(String[] args)
{
launch(args);
}
答
如果您打算将一些图形周围移动,您为什么然后开始使用画布?在画布上,除非你总是想一遍又一遍地重绘所有东西,否则不能移动任何东西。将你的矩形放到场景图中更适合这个任务。
好的,非常感谢 –