Question

我有一个矩形，周围有一些元素，用户可以用鼠标旋转它。这样的旋转可以与RotateTransform一起使用，但是旋转中心始终会存在一些偏移。我这样计算中心：

this.rotationCenter = this.cornerA.CalculatePointOnLine(this.cornerC, 0.5);

CornerA和CornerC是矩形的角并建立对角线。现在，我想相对于相应元素设置所有RotateTransforms的中心。

Logger.Logger.Write("coord.log", "center : " + this.rotationCenter.X + " ; " + this.rotationCenter.Y);
this.rotateSurroundingRectangle.CenterX = this.ParentLayer.TranslatePoint(this.rotationCenter, this.suroundingRectangle).X;
this.rotateSurroundingRectangle.CenterY = this.ParentLayer.TranslatePoint(this.rotationCenter, this.suroundingRectangle).Y;

Logger.Logger.Write("coord.log", "relative center : " + this.rotateSurroundingRectangle.CenterX + " ; " + this.rotateSurroundingRectangle.CenterY);

this.rotateResizeCorner1.CenterX = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner1).X;
this.rotateResizeCorner1.CenterY = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner1).Y;
this.rotateResizeCorner2.CenterX = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner2).X;
this.rotateResizeCorner2.CenterY = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner2).Y;
this.rotateResizeCorner3.CenterX = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner3).X;
this.rotateResizeCorner3.CenterY = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner3).Y;
this.rotateResizeCorner4.CenterX = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner4).X;
this.rotateResizeCorner4.CenterY = this.ParentLayer.TranslatePoint(this.rotationCenter, this.resizeCorner4).Y;
this.rotateRotationSign.CenterX = this.ParentLayer.TranslatePoint(this.rotationCenter, this.rotationSign).X;
this.rotateRotationSign.CenterY = this.ParentLayer.TranslatePoint(this.rotationCenter, this.rotationSign).Y;

根据角度，矩形周围所有元素的中心应更改，但矩形本身的中心应始终为32,32。但是值会有所不同，X和Y的值都在29到35之间。我已经检查了rotationCenter的计算，它是正确的。为什么会出现这种偏差，我该如何解决？谢谢...

Answer 1

好的，因为似乎没有人有任何想法，所以我决定绕开这个问题，而不是实际解决它。所以现在我“手动”计算相对旋转中心。我不确定这是否会帮助任何人，但对我有用。

this.rotateSurroundingRectangle.CenterX = (this.surroundingRectangle.Width * 0.5);
this.rotateSurroundingRectangle.CenterY = (this.surroundingRectangle.Height * 0.5);
this.rotateResizeCorner1.CenterX = this.rotationCenter.X - Canvas.GetLeft(this.resizeCornerA);
this.rotateResizeCorner1.CenterY = this.rotationCenter.Y - Canvas.GetTop(this.resizeCornerA);
this.rotateResizeCorner2.CenterX = this.rotationCenter.X - Canvas.GetLeft(this.resizeCornerB);
this.rotateResizeCorner2.CenterY = this.rotationCenter.Y - Canvas.GetTop(this.resizeCornerB);
this.rotateResizeCorner3.CenterX = this.rotationCenter.X - Canvas.GetLeft(this.resizeCornerC);
this.rotateResizeCorner3.CenterY = this.rotationCenter.Y - Canvas.GetTop(this.resizeCornerC);
this.rotateResizeCorner4.CenterX = this.rotationCenter.X - Canvas.GetLeft(this.resizeCornerD);
this.rotateResizeCorner4.CenterY = this.rotationCenter.Y - Canvas.GetTop(this.resizeCornerD);
this.rotateRotationSign.CenterX = this.rotationCenter.X - Canvas.GetLeft(this.rotationSign);
this.rotateRotationSign.CenterY = this.rotationCenter.Y - Canvas.GetTop(this.rotationSign);

通过UIElement.TranslatePoint计算子元素中心偏离正确值

1 个答案: