add:直线拉直与端点吸附
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CJK_mkp
@@ -19,6 +19,108 @@ namespace Ink_Canvas {
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try {
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inkCanvas.Opacity = 1;
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// 直线自动拉直功能
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if (Settings.Canvas.AutoStraightenLine && e.Stroke.StylusPoints.Count > 1 && drawingShapeMode == 0 && penType == 0) {
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// 获取起点和终点
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StylusPoint startPoint = e.Stroke.StylusPoints[0];
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StylusPoint endPoint = e.Stroke.StylusPoints[e.Stroke.StylusPoints.Count - 1];
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// 计算直线长度
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double length = Math.Sqrt(Math.Pow(endPoint.X - startPoint.X, 2) + Math.Pow(endPoint.Y - startPoint.Y, 2));
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// 判断是否需要拉直
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if (length >= Settings.Canvas.AutoStraightenLineThreshold) {
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// 判断是否符合直线特征（计算点到直线的最大距离）
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double maxDistance = 0;
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for (int i = 1; i < e.Stroke.StylusPoints.Count - 1; i++) {
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StylusPoint point = e.Stroke.StylusPoints[i];
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double distance = DistanceFromPointToLine(point, startPoint, endPoint);
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maxDistance = Math.Max(maxDistance, distance);
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}
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// 如果最大距离小于线长的15%，认为是直线
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if (maxDistance < length * 0.15) {
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// 创建新的直线点集合
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StylusPointCollection newPoints = new StylusPointCollection();
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// 直线端点吸附功能
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if (Settings.Canvas.LineEndpointSnapping) {
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bool startPointSnapped = false;
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bool endPointSnapped = false;
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// 获取画布上的所有笔画
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StrokeCollection allStrokes = inkCanvas.Strokes;
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// 排除当前笔画
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StrokeCollection otherStrokes = new StrokeCollection();
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foreach (Stroke stroke in allStrokes) {
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if (stroke != e.Stroke) {
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otherStrokes.Add(stroke);
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}
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}
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// 查找最近的端点
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double minStartDistance = Settings.Canvas.LineEndpointSnappingThreshold;
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double minEndDistance = Settings.Canvas.LineEndpointSnappingThreshold;
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StylusPoint nearestToStart = startPoint;
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StylusPoint nearestToEnd = endPoint;
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foreach (Stroke stroke in otherStrokes) {
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// 只考虑直线（只有两个点的笔画）
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if (stroke.StylusPoints.Count == 2) {
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StylusPoint strokeStart = stroke.StylusPoints[0];
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StylusPoint strokeEnd = stroke.StylusPoints[1];
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// 计算当前笔画起点到其他笔画端点的距离
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double distanceToStrokeStart = Distance(startPoint, strokeStart);
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double distanceToStrokeEnd = Distance(startPoint, strokeEnd);
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// 如果距离小于阈值且小于当前最小距离，更新最近点
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if (distanceToStrokeStart < minStartDistance) {
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minStartDistance = distanceToStrokeStart;
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nearestToStart = strokeStart;
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startPointSnapped = true;
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}
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if (distanceToStrokeEnd < minStartDistance) {
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minStartDistance = distanceToStrokeEnd;
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nearestToStart = strokeEnd;
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startPointSnapped = true;
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}
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// 计算当前笔画终点到其他笔画端点的距离
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double distanceEndToStrokeStart = Distance(endPoint, strokeStart);
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double distanceEndToStrokeEnd = Distance(endPoint, strokeEnd);
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// 如果距离小于阈值且小于当前最小距离，更新最近点
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if (distanceEndToStrokeStart < minEndDistance) {
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minEndDistance = distanceEndToStrokeStart;
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nearestToEnd = strokeStart;
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endPointSnapped = true;
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}
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if (distanceEndToStrokeEnd < minEndDistance) {
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minEndDistance = distanceEndToStrokeEnd;
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nearestToEnd = strokeEnd;
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endPointSnapped = true;
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}
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}
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}
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// 应用吸附结果
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newPoints.Add(startPointSnapped ? nearestToStart : startPoint);
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newPoints.Add(endPointSnapped ? nearestToEnd : endPoint);
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} else {
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// 不启用吸附，直接使用原始端点
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newPoints.Add(startPoint);
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newPoints.Add(endPoint);
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}
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// 替换原有笔迹
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e.Stroke.StylusPoints = newPoints;
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}
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}
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}
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if (Settings.InkToShape.IsInkToShapeEnabled && drawingShapeMode == 0 && !isInMultiTouchMode && penType == 0) {
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void InkToShapeProcess() {
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try {
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@@ -554,5 +656,31 @@ namespace Ink_Canvas {
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public StylusPoint GetCenterPoint(StylusPoint point1, StylusPoint point2) {
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return new StylusPoint((point1.X + point2.X) / 2, (point1.Y + point2.Y) / 2);
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}
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/// <summary>
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/// 计算点到直线的距离
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/// </summary>
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/// <param name="point">点</param>
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/// <param name="lineStart">直线起点</param>
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/// <param name="lineEnd">直线终点</param>
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/// <returns>距离</returns>
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private double DistanceFromPointToLine(StylusPoint point, StylusPoint lineStart, StylusPoint lineEnd) {
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double lineLength = Math.Sqrt(Math.Pow(lineEnd.X - lineStart.X, 2) + Math.Pow(lineEnd.Y - lineStart.Y, 2));
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if (lineLength == 0) return 0;
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double area = Math.Abs(
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(lineEnd.X - lineStart.X) * (lineStart.Y - point.Y) -
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(lineStart.X - point.X) * (lineEnd.Y - lineStart.Y)
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);
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return area / lineLength;
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}
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/// <summary>
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/// 计算两点之间的距离
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/// </summary>
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private double Distance(StylusPoint p1, StylusPoint p2) {
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return Math.Sqrt(Math.Pow(p2.X - p1.X, 2) + Math.Pow(p2.Y - p1.Y, 2));
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}
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}
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}
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