private void DrawCanvas(CanvasContext canvasCtx) { var size = canvasCtx.GetRealSize(width, height - toolBarHeight); if (Event.current.type == EventType.Repaint) { GL.PushMatrix(); CreateLineMaterial(); lineMaterial.SetPass(0); GL.LoadIdentity(); GL.MultMatrix(canvasCtx.GetTRSMatrix(size)); var p1 = canvasCtx.GetLocalPos(new Vector2(0, 1), size); var p2 = canvasCtx.GetLocalPos(new Vector2(1, 0), size); GLHelper.DrawGrid(100, new Rect(p1, p2 - p1)); OnDrawCanvas(canvasCtx); if (canvasCtx.m_isDrawSelection) { if (canvasCtx.m_dragStartPosition != canvasCtx.m_curLocalPosition) { GLHelper.DrawRectSolid(canvasCtx.m_dragStartPosition, canvasCtx.m_curLocalPosition, new Color(0, 0, 0, 0.5f)); } } GL.PopMatrix(); } }
protected virtual void ProcessEventInCanvas(CanvasContext canvasCtx) { canvasCtx.m_curLocalPosition = canvasCtx.GetLocalPos(canvasCtx.m_curMouseNormalizePosition, canvasCtx.GetRealSize(width, height - toolBarHeight)); //鼠标中键拖动视图 if (Event.current.type == EventType.MouseDrag && Event.current.button == 2) { canvasCtx.m_offset += Event.current.delta; Repaint(); } //鼠标滚轮缩放视图 if (Event.current.type == EventType.ScrollWheel) { canvasCtx.scale += Event.current.delta.y * -0.01f; Repaint(); } //选择和移动逻辑 //按下鼠标左键 if (Event.current.type == EventType.MouseDown && Event.current.button == 0) { var clickElement = canvasCtx.TestPoint(canvasCtx.m_curLocalPosition); canvasCtx.m_dragStartPosition = canvasCtx.m_curLocalPosition; if (clickElement == null) { //开始绘制选区 canvasCtx.ClearAllSelected(); canvasCtx.m_isDrawSelection = true; Repaint(); } else { if (!canvasCtx.IsSelected(clickElement)) { canvasCtx.ClearAllSelected(); canvasCtx.AddSelected(clickElement); } //开始拖动物体 canvasCtx.m_isDragElement = true; foreach (var element in canvasCtx.m_selectedElements) { if (element.canDrag) { element.m_dragStartPosition = element.position; } } Repaint(); } } //鼠标左键拖动 if (Event.current.type == EventType.MouseDrag && Event.current.button == 0) { if (canvasCtx.m_isDragElement) { foreach (var element in canvasCtx.m_selectedElements) { if (element.canDrag) { element.position = element.m_dragStartPosition + (canvasCtx.m_curLocalPosition - canvasCtx.m_dragStartPosition); } } Repaint(); } } //松开鼠标左键 if (Event.current.type == EventType.MouseUp && Event.current.button == 0) { //结束绘制选区,根据画出的选取选择对象 if (canvasCtx.m_isDrawSelection == true) { canvasCtx.m_isDrawSelection = false; var selections = canvasCtx.TestRect(canvasCtx.m_dragStartPosition, canvasCtx.m_curLocalPosition); canvasCtx.ClearAllSelected(); canvasCtx.AddSelected(selections); Repaint(); } else if (canvasCtx.m_isDragElement) { canvasCtx.m_isDragElement = false; } } }