我有兩個矩形：首先parent相對畫布中心旋轉-15度接下來children相對于畫布的中心旋轉-15度，相對于 的中心旋轉5度parent。獲取原始圖像：在圖像編輯器中進行了所述修改：有必要對矩形重復這些操作，這是我的代碼：var parentAngle = -15;var childrenAngle = 5;var parent = new Rectangle(new Point(50, 160), new Size(200, 300));var children = new Rectangle(new Point(25, 175), new Size(50, 50));// load transformed file to as canvasvar bmp = Image.FromFile(@"D:\Temp\transform.png");var size = bmp.Size;var canvasCenter = new PointF(size.Width / 2, size.Height / 2);var parentCenter = new PointF(parent.Location.X + parent.Width / 2, parent.Location.Y + parent.Height / 2);var parentLocation = parent.Location;var parentVertices = parent.GetVertices();var childrenVertices = children.GetVertices();// rotate by canvas centervar rotateMatrix = new Matrix();rotateMatrix.RotateAt(parentAngle, canvasCenter);rotateMatrix.TransformPoints(parentVertices);// rotate children verticesvar rotateMatrix2 = new Matrix();rotateMatrix2.RotateAt(childrenAngle, parentCenter);rotateMatrix2.TransformPoints(childrenVertices); // translate verticesvar translateMatrix = new Matrix();translateMatrix.Translate(parentLocation.X, parentLocation.Y);translateMatrix.TransformPoints(childrenVertices);// rotate by canvas centerrotateMatrix.TransformPoints(childrenVertices);using (Graphics g = Graphics.FromImage(bmp)){ g.DrawPolygon(Pens.Green, parentVertices); g.DrawPolygon(Pens.Blue, childrenVertices);}結果：我在某個地方弄錯了，父母匹配，但孩子不匹配。也許一切都在計算父偏移量時崩潰了？
1 回答
眼眸繁星
TA貢獻1873條經驗 獲得超9個贊
我發現了幾個問題：
首先- Paint.net 相對于畫布中心旋轉選定的圖層。因此，沒有任何結果，必須重新繪制測試用例
接下來- 我必須重新計算將孩子的位置轉移到頂部?，F在看起來像這樣：
var parentAngle = -15;
var childrenAngle = 5;
var parent = new Rectangle(new Point(50, 160), new Size(200, 300));
var children = new Rectangle(new Point(25, 175), new Size(50, 50));
// load transformed file to as canvas
var bmp = Image.FromFile(@"D:\Temp\rotate_5.png");
var size = bmp.Size;
var canvasCenter = new PointF(size.Width / 2, size.Height / 2);
var parentLocation = parent.Location;
var parentCenter = new PointF(parentLocation.X + parent.Width / 2, parentLocation.Y + parent.Height / 2);
var childrenLocation = children.Location;
// translate location children by parent location
children.Location = childrenLocation = new Point(parentLocation.X + childrenLocation.X, childrenLocation.Y + parentLocation.Y);
var childrenCenter = new PointF(childrenLocation.X + children.Width / 2, childrenLocation.Y + children.Height / 2);
var parentVertices = parent.GetVertices();
var childrenVertices = children.GetVertices();
//rotate by canvas center
var rotateChildrenMatrix = new Matrix();
rotateChildrenMatrix.RotateAt(childrenAngle, parentCenter);
rotateChildrenMatrix.TransformPoints(childrenVertices);
// rotate by canvas center
var rotateMatrix = new Matrix();
rotateMatrix.RotateAt(parentAngle, canvasCenter);
rotateMatrix.TransformPoints(parentVertices);
rotateMatrix.TransformPoints(childrenVertices);
using (Graphics g = Graphics.FromImage(bmp))
{
g.DrawPolygon(Pens.Green, parentVertices);
g.DrawPolygon(Pens.Blue, childrenVertices);
}
結果：
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