c# - 如何确定比例以将 Sprite 宽度增加到屏幕宽度

Question

我正在尝试实现类似于 How to increase (animate) the width of the square on both ends 的东西在团结中。如何确定增加( Sprite 的)宽度以填充整个屏幕宽度的比例？

更新

下面是我实现的扩展 Sprite 宽度以占据全屏宽度的Swift代码:

       func expandEnemy () {

         spritePosBeforeScaleX = CGPointMake((enemy?.sprite.position.x)!, (enemy?.sprite.anchorPoint.y)!)

         enemy?.sprite.anchorPoint = CGPointMake((enemy?.sprite.position.x)! / self.size.width, (enemy?.sprite.anchorPoint.y)!)
         let enemyScalingAction = SKAction.scaleXTo(self.size.width / (enemy?.sprite.size.width)!, duration: 1.0)
         enemy!.sprite.runAction(enemyScalingAction)

         delay(0.1)  
         {
            center = CGPointMake(enemy!.sprite.size.width / 2 - (enemy!.sprite.size.width * enemy!.sprite.anchorPoint.x), enemy!.sprite.size.height / 2 - (enemy!.sprite.size.height * enemy!.sprite.anchorPoint.y))
            enemy!.sprite.physicsBody = SKPhysicsBody(rectangleOfSize: enemy!.sprite.size, center: center)
         }
        }

Answer 1

这完全取决于屏幕的纵横比和带有 SpriteRenderer 的对象的大小。您需要将包含 spriterenderer 的游戏对象按比例放大，并将这些因素考虑在内。

[ExecuteInEditMode]
public class SpriteToScreen : MonoBehaviour {
public float sprw = 256f;
public float sprh = 256f;
float unitspp = 100f;
public float scrw = 0f;
public float scrh = 0f;
public float aspect = 0f;
public float spr_aspect = 1f;
public float factorY = 0.017578125f;
public void Update(){
    scrw = Screen.width;
    scrh = Screen.height;
    aspect = scrw / scrh;
    unitspp = this.GetComponent<SpriteRenderer>().sprite.pixelsPerUnit;
    sprw = this.GetComponent<SpriteRenderer>().sprite.bounds.size.x * unitspp;
    sprh = this.GetComponent<SpriteRenderer>().sprite.bounds.size.y * unitspp;
    spr_aspect = sprw / sprh;
    this.transform.localScale = new Vector3( (1152f / sprh * aspect) / spr_aspect,
        1152f / sprh, 
        1 );
}

}