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如何在画布上自上而下画一条线?

unity3d c#

StuckInPhDNoMore · 技术社区 · 7 年前

我想在我的游戏中添加一条分割左右区域的线。我在画布中添加了一个游戏对象,并添加了以下脚本:

public class DrawLine : MonoBehaviour
{
    public Color c1 = Color.red;
    public Color c2 = Color.white;
    Vector3 topPoint;
    Vector3 bottomPoint;

    // Start is called before the first frame update
    void Start()
    {
        topPoint = new Vector3(Screen.width / 4, Screen.height);
        bottomPoint = new Vector3(Screen.width / 4, 0);
        LineRenderer lineRenderer = gameObject.AddComponent<LineRenderer>();
        lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
        lineRenderer.widthMultiplier = 2.2f;
        lineRenderer.positionCount = 40;

        // A simple 2 color gradient with a fixed alpha of 1.0f.
        float alpha = 1.0f;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] { new GradientColorKey(c1, 0.0f), new GradientColorKey(c2, 1.0f) },
            new GradientAlphaKey[] { new GradientAlphaKey(alpha, 0.0f), new GradientAlphaKey(alpha, 1.0f) }
        );
        lineRenderer.colorGradient = gradient;

        lineRenderer.SetPosition(0, topPoint);
        lineRenderer.SetPosition(1, bottomPoint);
    }


}

当我比赛的时候。线条渲染器以所需的颜色和宽度添加到游戏对象中,但没有绘制线条。

我做错什么了?