我正在捕獲InkStrokes并且需要在背景中創建一個縮放的筆畫位圖圖像。無論墨水的邊界框有多大，捕獲的圖像都需要具有統一的大小。例如，如果繪制原始墨水筆劃，并且墨水畫布上的邊界框頂部/左側為 100,100 且大小為 200,200，我希望墨水從新渲染位圖的 0,0 處開始，即 50,50 大?。ê雎袁F在筆畫寬度的影響）。我已經弄清楚如何縮放墨跡筆劃（感謝StackOverflow），但不知道如何移動筆劃。現在，似乎我必須創建一個InkCanvas大小的位圖，渲染縮放后的墨水，然后將更大的圖像裁剪為正確的大小。我試過使用InkStroke.PointTranslate通過var scaleMatrix = Matrix3x2.CreateScale(scale);scaleMatrix.Translation = -offset; // top/left of ink stroke bounding boxstroke.PointTransform = scaleMatrix;但坐標不正確。非常感謝任何幫助。
2 回答
慕的地8271018
TA貢獻1796條經驗 獲得超4個贊
您可以通過矩陣相乘來組合變換。這對我有用
var strokes = inkCanvas.InkPresenter.StrokeContainer.GetStrokes();
var boundingBox = inkCanvas.InkPresenter.StrokeContainer.BoundingRect;
var matrix1 = Matrix3x2.CreateTranslation((float)-boundingBox.X, (float)-boundingBox.Y);
var matrix2 = Matrix3x2.CreateScale(0.5f);
var builder = new InkStrokeBuilder();
var newStrokeList = new List<InkStroke>();
foreach (var stroke in strokes)
{
newStrokeList.Add(builder.CreateStrokeFromInkPoints
(stroke.GetInkPoints(), matrix1 * matrix2));
}
//Add the translated and scaled strokes to the inkcanvas
inkCanvas.InkPresenter.StrokeContainer.AddStrokes(newStrokeList);
慕標5832272
TA貢獻1966條經驗 獲得超4個贊
也許我仍然做錯了什么，但看起來您不能將InkStrokeBuilder.CreateStrokeFromInkPoints與一種以上的轉換一起使用。我嘗試了各種組合/方法，但無法讓它發揮作用。
這是我的解決方案...
private static IList<InkStroke> GetScaledAndTransformedStrokes(IList<InkStroke> strokeList, float scale)
{
var builder = new InkStrokeBuilder();
var newStrokeList = new List<InkStroke>();
var boundingBox = strokeList.GetBoundingBox();
foreach (var singleStroke in strokeList)
{
var translateMatrix = new Matrix(1, 0, 0, 1, -boundingBox.X, -boundingBox.Y);
var newInkPoints = new List<InkPoint>();
var originalInkPoints = singleStroke.GetInkPoints();
foreach (var point in originalInkPoints)
{
var newPosition = translateMatrix.Transform(point.Position);
var newInkPoint = new InkPoint(newPosition, point.Pressure, point.TiltX, point.TiltY, point.Timestamp);
newInkPoints.Add(newInkPoint);
}
var newStroke = builder.CreateStrokeFromInkPoints(newInkPoints, new Matrix3x2(scale, 0, 0, scale, 0, 0));
newStrokeList.Add(newStroke);
}
return newStrokeList;
}
我最終不得不應用我自己的翻譯轉換，然后使用builder.CreateStrokeFromInkPoints和一個應用了比例矩陣來獲得我想要的結果。 GetBoundingBox是我自己的擴展：
public static class RectExtensions
{
public static Rect CombineWith(this Rect r, Rect rect)
{
var top = (r.Top < rect.Top) ? r.Top : rect.Top;
var left = (r.Left < rect.Left) ? r.Left : rect.Left;
var bottom = (r.Bottom < rect.Bottom) ? rect.Bottom : r.Bottom;
var right = (r.Right < rect.Right) ? rect.Right : r.Right;
var newRect = new Rect(new Point(left, top), new Point(right, bottom));
return newRect;
}
}
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