Java Snake游戏。(Java Snake game. Why is this image being drawn in completely the wrong location)

Java Snake游戏。(Java Snake game. Why is this image being drawn in completely the wrong location)

我正在使用Java制作一个简单的Snake游戏，我想在游戏板上使用图像而不是g.drawOval作为樱桃。 樱桃的位置是每次游戏加载时随机生成的，或樱桃被吃掉。

如果我使用g.fillOval方法，樱桃每次都会被绘制在正确的位置，但如果我使用图像，每次都会在不正确的位置绘制樱桃。

这是一个绘制樱桃的图像与完全相同的坐标（我用一个点代表樱桃）但你可以看到位置的明显差异。

樱桃位置的随机化按预期工作，这是绘制图像的问题

这是我的代码的结果：

红点是g.fillOval，是樱桃的正确位置樱桃图形是我的g.drawImage放樱桃的地方。

上图的X / Y为Cherry X/Y: 49 : 27

这是呈现游戏的代码：

import java.awt.Color; import java.awt.Graphics; import java.awt.Point; import javax.swing.JPanel; public class Render extends JPanel { private static final Color BG = new Color(0); private static final Color SNAKEBODY = new Color(3380564); private static final Color SNAKEHEAD = new Color(16724736); @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(BG); g.fillRect(0, 0, 800, 700); Snake snake = Snake.snake; g.setColor(SNAKEBODY); for (Point point : snake.snakeParts) { g.fillOval(point.x * Snake.SCALE, point.y * Snake.SCALE, Snake.SCALE, Snake.SCALE); } g.setColor(SNAKEHEAD); g.fillOval(snake.head.x * Snake.SCALE, snake.head.y * Snake.SCALE, Snake.SCALE, Snake.SCALE); g.setColor(Color.RED); g.drawImage(snake.cherryImg, snake.cherry.x, snake.cherry.y, snake.cherryImg.getWidth(null), snake.cherryImg.getHeight(null), null); g.fillOval(snake.cherry.x * 10, snake.cherry.y * 10,10, 10); //debug line System.out.println("Cherry X/Y: " + snake.cherry.x + " : " + snake.cherry.y); String string = "Score: " + snake.score + ", Length: " + snake.snakeSize; g.setColor(Color.white); //simple math to center ish text. g.drawString(string, (int) (getWidth() / 2 - string.length() * 2.5f), 10); string = "Game Over!"; if (snake.over){ g.drawString(string, (int) (getWidth() / 2 - string.length() * 2.5f), (int) snake.dim.getHeight() / 4); } string = "Paused!"; { if (snake.paused && !snake.over){ g.drawString(string, (int) (getWidth() / 2 - string.length() * 2.5f), (int) snake.dim.getHeight() / 4); } } } }

安迪身体可以看出为什么这些线上的图画有差异：

g.drawImage(snake.cherryImg, snake.cherry.x, snake.cherry.y,snake.cherryImg.getWidth(null), snake.cherryImg.getHeight(null), null); g.fillOval(snake.cherry.x * 10, snake.cherry.y * 10, 10, 10); //debug line System.out.println("Cherry X/Y: " + snake.cherry.x + " : " + snake.cherry.y);

I am making a simple Snake game in Java, and i want to use an image rather than a g.drawOval for a cherry on my game board. The cherry's location in randomly generated each time the game loads, or the cherry is eaten.

If i use the g.fillOval method, the cherry gets drawn in the correct location every time, but if i use an image the cherry is being drawn in the incorrect location every time.

Here is an image of the drawn cherry with the EXACT same coordinates (i am using a Point to represent the cherry) but you can see the clear differences in location.

The randomisation of the cherry's location is working as intended, it is a problem with drawing the image

Here is the outcome of my code:

The red dot is the g.fillOval and is the Correct location for the cherry The Cherry graphic is where my g.drawImage puts the cherry.

The X/Y for the above image is Cherry X/Y: 49 : 27

This is the code which renders the game:

import java.awt.Color; import java.awt.Graphics; import java.awt.Point; import javax.swing.JPanel; public class Render extends JPanel { private static final Color BG = new Color(0); private static final Color SNAKEBODY = new Color(3380564); private static final Color SNAKEHEAD = new Color(16724736); @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(BG); g.fillRect(0, 0, 800, 700); Snake snake = Snake.snake; g.setColor(SNAKEBODY); for (Point point : snake.snakeParts) { g.fillOval(point.x * Snake.SCALE, point.y * Snake.SCALE, Snake.SCALE, Snake.SCALE); } g.setColor(SNAKEHEAD); g.fillOval(snake.head.x * Snake.SCALE, snake.head.y * Snake.SCALE, Snake.SCALE, Snake.SCALE); g.setColor(Color.RED); g.drawImage(snake.cherryImg, snake.cherry.x, snake.cherry.y, snake.cherryImg.getWidth(null), snake.cherryImg.getHeight(null), null); g.fillOval(snake.cherry.x * 10, snake.cherry.y * 10,10, 10); //debug line System.out.println("Cherry X/Y: " + snake.cherry.x + " : " + snake.cherry.y); String string = "Score: " + snake.score + ", Length: " + snake.snakeSize; g.setColor(Color.white); //simple math to center ish text. g.drawString(string, (int) (getWidth() / 2 - string.length() * 2.5f), 10); string = "Game Over!"; if (snake.over){ g.drawString(string, (int) (getWidth() / 2 - string.length() * 2.5f), (int) snake.dim.getHeight() / 4); } string = "Paused!"; { if (snake.paused && !snake.over){ g.drawString(string, (int) (getWidth() / 2 - string.length() * 2.5f), (int) snake.dim.getHeight() / 4); } } } }

Can andy body see why there is differences in the drawing on these lines:

g.drawImage(snake.cherryImg, snake.cherry.x, snake.cherry.y,snake.cherryImg.getWidth(null), snake.cherryImg.getHeight(null), null); g.fillOval(snake.cherry.x * 10, snake.cherry.y * 10, 10, 10); //debug line System.out.println("Cherry X/Y: " + snake.cherry.x + " : " + snake.cherry.y);

最满意答案

看看你的两个职位。

你的填充椭圆形发生在snake.cherry.x*10而图像是在snake.cherry.x上绘制的（同样为Y）

这就是为什么图像是49,27，点是490,270

Look at your two positions.

Your fill oval is happening at snake.cherry.x*10 while the image is drawn at snake.cherry.x (SAME FOR Y)

Thats why the image is at 49,27 and the dot is at 490,270