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所以我在这个状态上有两个按钮点击这里查看截图

实际发生的是我的第二个按钮“开始”不适用于以下值：

backButton.renderImage(g, CONTAINER_CENTER_X - backButton.getWidth() - 10, CONTAINER_MAX_Y - backButton.getHeight() - 30);
startButton.renderImage(g, CONTAINER_CENTER_X + 10, CONTAINER_MAX_Y - startButton.getHeight() - 30);

这是我为 x 和 y 设置的按钮坐标和值的输出：

返回按钮：[x=245, y= 535, width= 145, height=35] / 当前 X: 245 / 当前 Y: 535 开始按钮: [x=410, y= 535, width= 0, height=35] / 当前 X：410 / 当前 Y：535

然后我发现，通过加减 button.getWidth()，我可以让按钮工作

backButton.renderImage(g, CONTAINER_CENTER_X - backButton.getWidth() - 10, CONTAINER_MAX_Y - backButton.getHeight() - 30);
startButton.renderImage(g, CONTAINER_CENTER_X  + startButton.getWidth() - startButton.getWidth() + 10, CONTAINER_MAX_Y - startButton.getHeight() - 30);

这很奇怪，而且非常丑陋......：D

这是我为 x 和 y 设置的按钮坐标和值的输出：

返回按钮：[x=245, y= 535, width= 145, height=35] / 当前 X: 245 / 当前 Y: 535 开始按钮: [x=410, y= 535, width= 145, height=35] / 当前 X：410 / 当前 Y：535

那么，检查一下这个状态码和按钮类，告诉我你怎么看？

这个状态

package poker;

import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Image;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.state.BasicGameState;
import org.newdawn.slick.state.StateBasedGame;
import org.newdawn.slick.state.transition.FadeInTransition;
import org.newdawn.slick.state.transition.FadeOutTransition;
import poker.gui.PButton;
import poker.gui.UIConstants;
import static poker.gui.UIConstants.CONTAINER_CENTER_X;
import static poker.gui.UIConstants.CONTAINER_MAX_Y;
import poker.util.RandomUtility;

public class SetupScreenState extends BasicGameState implements UIConstants, StatePanelInterface {

    public static final int ID = 2;
    private Image titleImage;
    private PButton backButton;
    private PButton startButton;

    public SetupScreenState() {
    }

    @Override
    public int getID() {
        return ID;
    }

    @Override
    public void init(GameContainer container, StateBasedGame game) throws SlickException {
        titleImage = new Image("res/gui/title_setup.png");

        backButton = new PButton("res/gui/button_back.png", "res/gui/button_back_hover.png");
        startButton = new PButton("res/gui/button_start.png", "res/gui/button_start_hover.png");
    } 

    @Override
    public void render(GameContainer container, StateBasedGame game, Graphics g) throws SlickException {
        RandomUtility.bgTheme(container, g);

        renderTopPanel(container, game, g);
        renderCenterPanel(container, game, g);
        renderBottomPanel(container, game, g);
    }

    @Override
    public void update(GameContainer container, StateBasedGame game, int delta) throws SlickException {
        Input input = container.getInput();
        int mx = input.getMouseX();
        int my = input.getMouseY();

        if (backButton.contains(mx, my)) {
            if (backButton.isButtonPressed(input)) {
                game.enterState(StartScreenState.ID, new FadeOutTransition(), new FadeInTransition());
            }
        } else if (startButton.contains(mx, my)) {
            if (startButton.isButtonPressed(input)) {
                game.enterState(PlayScreenState.ID, new FadeOutTransition(), new FadeInTransition());
            }
        }
    }

    @Override
    public void renderTopPanel(GameContainer container, StateBasedGame game, Graphics g) throws SlickException {
        g.drawImage(titleImage, 50, 50);
    }

    @Override
    public void renderCenterPanel(GameContainer container, StateBasedGame game, Graphics g) throws SlickException {

    }

    @Override
    public void renderBottomPanel(GameContainer container, StateBasedGame game, Graphics g) throws SlickException { 
        backButton.renderImage(g, CONTAINER_CENTER_X - backButton.getWidth() - 10, CONTAINER_MAX_Y - backButton.getHeight() - 30);
        startButton.renderImage(g, CONTAINER_CENTER_X  + startButton.getWidth() - startButton.getWidth() + 10, CONTAINER_MAX_Y - startButton.getHeight() - 30);
    }

}

按钮类

package poker.gui;

import org.newdawn.slick.Graphics;
import org.newdawn.slick.Image;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;

public class PButton {

    private int x;
    private int y;
    private int width;
    private int height;

    private Image image;
    private String classicImage;
    private String hoverImage;

    public PButton() {
    }

    public PButton(String classicImage, String hoverImage) throws SlickException {
        this.classicImage = classicImage;
        this.hoverImage = hoverImage;

        image = new Image(classicImage);
    }

    public PButton(String classicImage, String hoverImage, int x, int y) throws SlickException {
        this.classicImage = classicImage;
        this.hoverImage = hoverImage;
        this.x = x;
        this.y = y;

        image = new Image(classicImage);
    }

    public void renderImage(Graphics g) {
        g.drawImage(image, x, y);
    }

    public void renderImage(Graphics g, int x, int y) throws SlickException {
        this.x = x;
        this.y = y;

        g.drawImage(image, x, y);
    }

    public boolean contains(int x, int y) throws SlickException {
        int minX = this.x;
        int minY = this.y;
        int maxX = this.x + this.width;
        int maxY = this.y + this.height;

        if ((x > minX && x < maxX) && (y > minY && y < maxY)) {
            if (hoverImage != null) {
                image = new Image(hoverImage);
            }
            return true;
        }
        image = new Image(classicImage);
        return false;
    }

    public boolean isButtonPressed(Input input) throws SlickException {
        return input.isMouseButtonDown(Input.MOUSE_LEFT_BUTTON);
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getWidth() {
        return width = image.getWidth();
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public int getHeight() {
        return height = image.getHeight();
    }

    public Image getImage() {
        return image;
    }

    public void setImage(Image image) {
        this.image = image;
    }

    @Override
    public String toString() {
        return "[x=" + x + ", y= " + y + ", width= " + width + ", height=" + height + "]";
    }
}
4

1 回答 1

0

您的问题是您没有正确初始化宽度字段。

在contains()中，您使用this.width，但它尚未初始化（或者确切地说，它已默认初始化为 0，因为它是一个实例变量）。

当你调用时getWidth()，width初始化是因为return width = image.getWidth();assigns this.width = image.getWidth()，这解释了为什么你必须调用getWidth()才能让你的按钮工作。

确保正确初始化按钮字段。例如，当您创建按钮时（即在构造函数中），您应该将宽度设置为image.getWidth()

于 2013-07-23T22:09:31.973 回答