垂直健康条

Question

现在我正在开发一款游戏，我正在实现一个健康条。我在做正确的配方时遇到了困难。这是我在图片中看到的Hud的代码：

public class CharacterHUD {

    private Image image;
    private Player player;

    private float xHealth, yHealth;
    private float healthBarWidth, healthBarHeight;
    private double healthBarY = 0;
    private double multiplier;

    public CharacterHUD(float xHealth, float yHealth, Image image, Player player) {
        this.image = image;
        this.player = player;
        this.xHealth = xHealth; // X Offset from the frame, 20 in this case.
        this.yHealth = yHealth; // Y Offset from the frame, 17 in this case.
        healthBarWidth = 38;
        healthBarHeight = 173;
    }

    public void update(int delta) {
        healthBarY = (yHealth / 100 * player.getHealth());
        multiplier = (yHealth / healthBarY);
        Log.log("Percentage: " + multiplier);
        Log.log("yHealth: " + yHealth + "+ Health: " + healthBarY);
        Log.log("Actual yHealth: " + (healthBarHeight * multiplier));

    }

    public void render(Graphics g) {
        // The coordinates are going from top-left(x,y) to bottomright(width,height). Also, the yHealth is the offset from the frame. 
        Resources.healthBar.draw(xHealth, (float) (healthBarHeight / multiplier) + yHealth, healthBarWidth, (float) (healthBarHeight / multiplier));
        image.draw(0, 0);
    }

}

在50健康状态下，它看起来像这样：

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在75健康状态下，它看起来像这样：

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我做错了什么？

Answer 1

会不会是

Resources.healthBar.draw(xHealth, (float) (healthBarHeight / multiplier) - yHealth, healthBarWidth, (float) (healthBarHeight / multiplier));

代替+ yHealth

注意:我不熟悉您正在使用的方法，但它似乎使用了窗口坐标(从左上角开始)，这意味着开始时的y坐标应该随着健康的增加而减少。

Answer 2

你对横杆高度的计算是反向的。我不知道Resource.HealthBar中的参数是什么顺序，也不知道它们允许什么，但这里有一些您想要的伪代码。

topLeft = (healthBarLeft, healthBarTop + (1 - healthPercent) * healthBarHeight)
bottomRight = (healthBarLeft + healthBarWidth, healthBarTop + healthBarHeight)

(1 - healthPercent)意味着当你还剩下10%的生命值时，条形将从90%开始下降。

编辑:如果它不支持topLeft / bottomRight，而是需要一个宽/高，请使用：

dimensions = (healthBarWidth, healthPercent * healthBarHeight)