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已知发射点，如何生成一条经过发射点和鼠标所在点的直线，并自动延伸
@卸下偶像包袱 找个精灵对象，图像最好是导入一个纯色块，锚点设置在左边中点，宽度设置到超出屏幕的程度（例如2000），然后每帧设置位置在发射点的位置，并让角度用动作朝向鼠标的坐标
