使用 C++ 管理簡報中的連接線

本頁內容簡介

了解如何使用 Aspose.Slides for C++ 在 PowerPoint 中新增、附加、重新路由、調整和檢查直線、彎曲與曲線連接線。

概述

連接線是一條在任一圖形移動時仍可保持連接兩個圖形的直線。它的兩端會連接到連接點，這些連接點在 PowerPoint 中以綠色點顯示。某些彎曲和曲線連接線還會顯示調整點，以橙色點表示，用於控制各個連接線段的位置。

Aspose.Slides 透過 IConnector 介面表示連接線。您可以建立連接線、將其兩端附加到圖形、選擇連接點、重新路由，並修改具有調整點的連接線的幾何形狀。

連接線類型

ShapeType 列舉包含直線、彎曲和曲線連接線預設。下表顯示可用的連接線幾何形狀以及每個預設所定義的調整點數量。

連接線	圖像	調整點數量
ShapeType::Line		0
ShapeType::StraightConnector1		0
ShapeType::BentConnector2		0
ShapeType::BentConnector3		1
ShapeType::BentConnector4		2
ShapeType::BentConnector5		3
ShapeType::CurvedConnector2		0
ShapeType::CurvedConnector3		1
ShapeType::CurvedConnector4		2
ShapeType::CurvedConnector5		3

調整點的數量與意義屬於所選擇的連接線預設。不要假設兩種不同的連接線類型會暴露相同的集合佈局。

連接兩個圖形

使用 IShapeCollection::AddConnector 新增連接線，並呼叫 IConnector::set_StartShapeConnectedTo 與 IConnector::set_EndShapeConnectedTo 以附加其兩端。兩端都附加後，IConnector::Reroute 會在圖形之間選擇最短路徑。

以下範例使用彎曲連接線將橢圓形和矩形連接起來：

#include <DOM/IAutoShape.h>
#include <DOM/IConnector.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;

System::SharedPtr<Presentation> presentation = System::MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

auto ellipse = shapes->AddAutoShape(ShapeType::Ellipse, 40, 80, 120, 80);
auto rectangle = shapes->AddAutoShape(ShapeType::Rectangle, 320, 240, 140, 80);
auto connector = shapes->AddConnector(ShapeType::BentConnector2, 0, 0, 10, 10);

connector->set_StartShapeConnectedTo(ellipse);
connector->set_EndShapeConnectedTo(rectangle);
connector->Reroute();

presentation->Save(u"connected-shapes.pptx", SaveFormat::Pptx);

Warning

呼叫 IConnector::Reroute 可能會變更 IConnector::set_StartShapeConnectionSiteIndex 與 IConnector::set_EndShapeConnectionSiteIndex 的值。若這些連接點必須固定，請在重新路由後再指派特定的連接點。

選擇連接點

每個可連接的圖形會透過 IShape::get_ConnectionSiteCount 回報其連接點數量。於指派給連接線端點之前，先驗證所選的零基索引；不同圖形的連接點數量會因幾何形狀而異。

此範例在橢圓形上存在特定連接點時將連接線附加到該點：

#include <DOM/IAutoShape.h>
#include <DOM/IConnector.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>
#include <system/console.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System;

auto presentation = MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

auto ellipse = shapes->AddAutoShape(ShapeType::Ellipse, 40, 80, 120, 80);
auto rectangle = shapes->AddAutoShape(ShapeType::Rectangle, 320, 240, 140, 80);
auto connector = shapes->AddConnector(ShapeType::BentConnector3, 0, 0, 10, 10);

connector->set_StartShapeConnectedTo(ellipse);
connector->set_EndShapeConnectedTo(rectangle);

int32_t preferredSiteIndex = 2;
if (preferredSiteIndex < ellipse->get_ConnectionSiteCount())
{
    connector->set_StartShapeConnectionSiteIndex(preferredSiteIndex);
}
else
{
    Console::WriteLine(u"The ellipse has only {0} connection sites.", ellipse->get_ConnectionSiteCount());
}

presentation->Save(u"specific-connection-site.pptx", SaveFormat::Pptx);

調整連接線點

具有調整點的連接線會透過 IGeometryShape::get_Adjustments 暴露這些點。檢查每個 IAdjustValue 並於變更其 IAdjustValue::set_RawValue 前先確認其 IAdjustValue::get_Type。關於辨識預設圖形調整的通用規則，請參閱 Shape Manipulation。

調整點的數量、順序、意義與有效值範圍皆取決於連接線的預設。IAdjustValue::get_Type 回傳的型別為唯讀，而原始調整值則可寫入。唯讀的 IAdjustValue::get_Name 方法在連接線包含多個相同語意類型的調整時提供額外辨識資訊。

繞過障礙物

在下列版面配置中，ShapeType::BentConnector5 連接線在兩個圖形之間穿過第三個圖形：

以下程式碼建立了受阻的連接線：

#include <DOM/FillType.h>
#include <DOM/IAutoShape.h>
#include <DOM/IColorFormat.h>
#include <DOM/IConnector.h>
#include <DOM/ILineFillFormat.h>
#include <DOM/ILineFormat.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/LineArrowheadStyle.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>
#include <drawing/color.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System::Drawing;

auto presentation = System::MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

shapes->AddAutoShape(ShapeType::Rectangle, 300, 150, 150, 75);
auto sourceShape = shapes->AddAutoShape(ShapeType::Rectangle, 500, 400, 100, 50);
auto targetShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 100, 70, 30);
auto connector = shapes->AddConnector(ShapeType::BentConnector5, 20, 20, 400, 300);

auto lineFormat = connector->get_LineFormat();
lineFormat->set_EndArrowheadStyle(LineArrowheadStyle::Triangle);
auto lineFillFormat = lineFormat->get_FillFormat();
lineFillFormat->set_FillType(FillType::Solid);
lineFillFormat->get_SolidFillColor()->set_Color(Color::get_Black());
connector->set_StartShapeConnectedTo(sourceShape);
connector->set_EndShapeConnectedTo(targetShape);
connector->set_StartShapeConnectionSiteIndex(2);

presentation->Save(u"connector-obstruction.pptx", SaveFormat::Pptx);

移動垂直彎曲點會改變路徑，使連接線繞過障礙物：

此範例不假設索引 1 永遠代表垂直彎曲，而是搜尋 ShapeAdjustmentType::ConnectorBendPositionY，僅在預期的語意類型存在時才修改：

#include <DOM/FillType.h>
#include <DOM/IAdjustValue.h>
#include <DOM/IAdjustValueCollection.h>
#include <DOM/IAutoShape.h>
#include <DOM/IColorFormat.h>
#include <DOM/IConnector.h>
#include <DOM/ILineFillFormat.h>
#include <DOM/ILineFormat.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/LineArrowheadStyle.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeAdjustmentType.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>
#include <drawing/color.h>
#include <system/console.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System;
using namespace System::Drawing;

auto presentation = MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

shapes->AddAutoShape(ShapeType::Rectangle, 300, 150, 150, 75);
auto sourceShape = shapes->AddAutoShape(ShapeType::Rectangle, 500, 400, 100, 50);
auto targetShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 100, 70, 30);
auto connector = shapes->AddConnector(ShapeType::BentConnector5, 20, 20, 400, 300);

auto lineFormat = connector->get_LineFormat();
lineFormat->set_EndArrowheadStyle(LineArrowheadStyle::Triangle);
auto lineFillFormat = lineFormat->get_FillFormat();
lineFillFormat->set_FillType(FillType::Solid);
lineFillFormat->get_SolidFillColor()->set_Color(Color::get_Black());
connector->set_StartShapeConnectedTo(sourceShape);
connector->set_EndShapeConnectedTo(targetShape);
connector->set_StartShapeConnectionSiteIndex(2);

SharedPtr<IAdjustValue> verticalBend;
auto adjustments = connector->get_Adjustments();
for (int32_t adjustmentIndex = 0; adjustmentIndex < adjustments->get_Count(); ++adjustmentIndex)
{
    auto adjustment = adjustments->idx_get(adjustmentIndex);
    Console::WriteLine(u"{0}: type = {1}, raw value = {2}", adjustment->get_Name(), static_cast<int32_t>(adjustment->get_Type()), adjustment->get_RawValue());
    if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionY)
    {
        verticalBend = adjustment;
        break;
    }
}

if (verticalBend == nullptr)
{
    Console::WriteLine(u"The connector does not expose a vertical bend adjustment.");
}
else
{
    verticalBend->set_RawValue(60000);
    presentation->Save(u"connector-obstruction-fixed.pptx", SaveFormat::Pptx);
}

ShapeType::BentConnector5 具有兩個 ShapeAdjustmentType::ConnectorBendPositionX 調整點與一個 ShapeAdjustmentType::ConnectorBendPositionY 調整點。若所需類型出現多次，請檢查 IAdjustValue::get_Name 並依照該預設的已知幾何形狀選取。若調整點回報 ShapeAdjustmentType::Custom，則其意義與範圍屬於特定預設，在未清楚了解合約前請勿變更。

將調整值對應至連接線幾何

對於彎曲連接線，調整值可用於推估個別段的座標。這些計算特定於連接線的預設：

• ShapeType::BentConnector4 通常會暴露一個 ShapeAdjustmentType::ConnectorBendPositionX 與一個 ShapeAdjustmentType::ConnectorBendPositionY 調整點。
• 對於這兩個彎曲位置，RawValue / 100000.0f 會產生相對於連接線框寬度或高度的比例，以下範例即使用此比例。
• 連接線框可能被旋轉或翻轉，故在與投影片座標比較之前必須先轉換框座標。

以下範例先使用 IAdjustValue::get_Type 辨識調整點，並未把集合索引視為可移植的識別子。

未旋轉的連接線

最初的版面包含兩個文字圖形，由 ShapeType::BentConnector4 連接：

此範例檢查連接線並取得其水平與垂直彎曲調整點：

#include <DOM/FillType.h>
#include <DOM/IAdjustValue.h>
#include <DOM/IAdjustValueCollection.h>
#include <DOM/IAutoShape.h>
#include <DOM/IColorFormat.h>
#include <DOM/IConnector.h>
#include <DOM/ILineFillFormat.h>
#include <DOM/ILineFormat.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/ITextFrame.h>
#include <DOM/LineArrowheadStyle.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeAdjustmentType.h>
#include <DOM/ShapeType.h>
#include <drawing/color.h>
#include <system/console.h>

using namespace Aspose::Slides;
using namespace System;
using namespace System::Drawing;

auto presentation = MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

auto sourceShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 100, 60, 25);
sourceShape->get_TextFrame()->set_Text(u"From");
auto targetShape = shapes->AddAutoShape(ShapeType::Rectangle, 500, 100, 60, 25);
targetShape->get_TextFrame()->set_Text(u"To");
auto connector = shapes->AddConnector(ShapeType::BentConnector4, 20, 20, 400, 300);

auto lineFormat = connector->get_LineFormat();
lineFormat->set_EndArrowheadStyle(LineArrowheadStyle::Triangle);
auto lineFillFormat = lineFormat->get_FillFormat();
lineFillFormat->set_FillType(FillType::Solid);
lineFillFormat->get_SolidFillColor()->set_Color(Color::get_Crimson());
lineFormat->set_Width(3);
connector->set_StartShapeConnectedTo(sourceShape);
connector->set_StartShapeConnectionSiteIndex(3);
connector->set_EndShapeConnectedTo(targetShape);
connector->set_EndShapeConnectionSiteIndex(2);

auto adjustments = connector->get_Adjustments();
for (int32_t adjustmentIndex = 0; adjustmentIndex < adjustments->get_Count(); ++adjustmentIndex)
{
    auto adjustment = adjustments->idx_get(adjustmentIndex);
    Console::WriteLine(u"{0}: type = {1}, raw value = {2}", adjustment->get_Name(), static_cast<int32_t>(adjustment->get_Type()), adjustment->get_RawValue());
}

若要同時變更兩個彎曲點，請先找到每個預期類型，並在兩者都被找到後才修改其值：

#include <DOM/IAdjustValue.h>
#include <DOM/IAdjustValueCollection.h>
#include <DOM/IAutoShape.h>
#include <DOM/IConnector.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeAdjustmentType.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>
#include <system/console.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System;

auto presentation = MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

auto sourceShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 100, 60, 25);
auto targetShape = shapes->AddAutoShape(ShapeType::Rectangle, 500, 100, 60, 25);
auto connector = shapes->AddConnector(ShapeType::BentConnector4, 20, 20, 400, 300);
connector->set_StartShapeConnectedTo(sourceShape);
connector->set_StartShapeConnectionSiteIndex(3);
connector->set_EndShapeConnectedTo(targetShape);
connector->set_EndShapeConnectionSiteIndex(2);

SharedPtr<IAdjustValue> horizontalBend;
SharedPtr<IAdjustValue> verticalBend;
auto adjustments = connector->get_Adjustments();
for (int32_t adjustmentIndex = 0; adjustmentIndex < adjustments->get_Count(); ++adjustmentIndex)
{
    auto adjustment = adjustments->idx_get(adjustmentIndex);
    if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionX)
    {
        horizontalBend = adjustment;
    }
    else if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionY)
    {
        verticalBend = adjustment;
    }
}

if (horizontalBend == nullptr || verticalBend == nullptr)
{
    Console::WriteLine(u"The connector does not expose the expected bend adjustments.");
}
else
{
    horizontalBend->set_RawValue(horizontalBend->get_RawValue() + 20000);
    verticalBend->set_RawValue(verticalBend->get_RawValue() + 200000);
    presentation->Save(u"connector-adjusted.pptx", SaveFormat::Pptx);
}

結果是一條水平與垂直段已移動的連接線：

當語意類型已知後，便可將其值轉換為連接線框座標。此範例在由兩個彎曲調整點控制的垂直段上繪製一個細長矩形：

#include <DOM/IAdjustValue.h>
#include <DOM/IAdjustValueCollection.h>
#include <DOM/IAutoShape.h>
#include <DOM/IConnector.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeAdjustmentType.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>
#include <system/console.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System;

auto presentation = MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

auto sourceShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 100, 60, 25);
auto targetShape = shapes->AddAutoShape(ShapeType::Rectangle, 500, 100, 60, 25);
auto connector = shapes->AddConnector(ShapeType::BentConnector4, 20, 20, 400, 300);
connector->set_StartShapeConnectedTo(sourceShape);
connector->set_StartShapeConnectionSiteIndex(3);
connector->set_EndShapeConnectedTo(targetShape);
connector->set_EndShapeConnectionSiteIndex(2);

SharedPtr<IAdjustValue> horizontalBend;
SharedPtr<IAdjustValue> verticalBend;
auto adjustments = connector->get_Adjustments();
for (int32_t adjustmentIndex = 0; adjustmentIndex < adjustments->get_Count(); ++adjustmentIndex)
{
    auto adjustment = adjustments->idx_get(adjustmentIndex);
    if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionX)
    {
        horizontalBend = adjustment;
    }
    else if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionY)
    {
        verticalBend = adjustment;
    }
}

if (horizontalBend == nullptr || verticalBend == nullptr)
{
    Console::WriteLine(u"The connector does not expose the expected bend adjustments.");
}
else
{
    float x = connector->get_X() + connector->get_Width() * horizontalBend->get_RawValue() / 100000.0f;
    float y = connector->get_Y();
    float height = connector->get_Height() * verticalBend->get_RawValue() / 100000.0f;
    shapes->AddAutoShape(ShapeType::Rectangle, x, y, 1, height);
    presentation->Save(u"connector-segment-guide.pptx", SaveFormat::Pptx);
}

指引圖形標示出計算出的段落：

旋轉或翻轉的連接線

當相同的幾何形狀以垂直方向呈現時，其 IShape::get_Frame、IShapeFrame::get_FlipH、以及 IShapeFrame::get_FlipV 會影響從連接線框座標到投影片座標的轉換。

此範例建立並調整垂直方向的連接線：

#include <DOM/FillType.h>
#include <DOM/IAdjustValue.h>
#include <DOM/IAdjustValueCollection.h>
#include <DOM/IAutoShape.h>
#include <DOM/IColorFormat.h>
#include <DOM/IConnector.h>
#include <DOM/ILineFillFormat.h>
#include <DOM/ILineFormat.h>
#include <DOM/IShapeCollection.h>
#include <DOM/ISlide.h>
#include <DOM/ITextFrame.h>
#include <DOM/LineArrowheadStyle.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeAdjustmentType.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>
#include <drawing/color.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System::Drawing;

auto presentation = System::MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

auto sourceShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 100, 60, 25);
sourceShape->get_TextFrame()->set_Text(u"From");
auto targetShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 400, 60, 25);
targetShape->get_TextFrame()->set_Text(u"To 1");
auto connector = shapes->AddConnector(ShapeType::BentConnector4, 20, 20, 400, 300);

auto lineFormat = connector->get_LineFormat();
lineFormat->set_EndArrowheadStyle(LineArrowheadStyle::Triangle);
auto lineFillFormat = lineFormat->get_FillFormat();
lineFillFormat->set_FillType(FillType::Solid);
lineFillFormat->get_SolidFillColor()->set_Color(Color::get_MediumAquamarine());
lineFormat->set_Width(3);
connector->set_StartShapeConnectedTo(sourceShape);
connector->set_StartShapeConnectionSiteIndex(2);
connector->set_EndShapeConnectedTo(targetShape);
connector->set_EndShapeConnectionSiteIndex(3);

auto adjustments = connector->get_Adjustments();
for (int32_t adjustmentIndex = 0; adjustmentIndex < adjustments->get_Count(); ++adjustmentIndex)
{
    auto adjustment = adjustments->idx_get(adjustmentIndex);
    if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionX)
    {
        adjustment->set_RawValue(adjustment->get_RawValue() + 20000);
    }
    else if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionY)
    {
        adjustment->set_RawValue(adjustment->get_RawValue() + 200000);
    }
}

presentation->Save(u"vertical-connector-adjusted.pptx", SaveFormat::Pptx);

調整後的連接線以垂直方式位於兩個圖形之間：

對於任意旋轉角度 alpha，將連接線框點 (x, y) 繞框中心 (x0, y0) 旋轉：

X = (x - x0) * cos(alpha) - (y - y0) * sin(alpha) + x0

Y = (x - x0) * sin(alpha) + (y - y0) * cos(alpha) + y0

以下程式碼處理本範例使用的 90 度方向，並在相應的連接線段上繪製紅色指引線：

#include <DOM/FillType.h>
#include <DOM/IAdjustValue.h>
#include <DOM/IAdjustValueCollection.h>
#include <DOM/IAutoShape.h>
#include <DOM/IColorFormat.h>
#include <DOM/IConnector.h>
#include <DOM/ILineFillFormat.h>
#include <DOM/ILineFormat.h>
#include <DOM/IShapeCollection.h>
#include <DOM/IShapeFrame.h>
#include <DOM/ISlide.h>
#include <DOM/NullableBool.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeAdjustmentType.h>
#include <DOM/ShapeType.h>
#include <Export/SaveFormat.h>
#include <drawing/color.h>
#include <system/console.h>

using namespace Aspose::Slides;
using namespace Aspose::Slides::Export;
using namespace System;
using namespace System::Drawing;

auto presentation = MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto shapes = slide->get_Shapes();

auto sourceShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 100, 60, 25);
auto targetShape = shapes->AddAutoShape(ShapeType::Rectangle, 100, 400, 60, 25);
auto connector = shapes->AddConnector(ShapeType::BentConnector4, 20, 20, 400, 300);
connector->set_StartShapeConnectedTo(sourceShape);
connector->set_StartShapeConnectionSiteIndex(2);
connector->set_EndShapeConnectedTo(targetShape);
connector->set_EndShapeConnectionSiteIndex(3);

SharedPtr<IAdjustValue> horizontalBend;
SharedPtr<IAdjustValue> verticalBend;
auto adjustments = connector->get_Adjustments();
for (int32_t adjustmentIndex = 0; adjustmentIndex < adjustments->get_Count(); ++adjustmentIndex)
{
    auto adjustment = adjustments->idx_get(adjustmentIndex);
    if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionX)
    {
        horizontalBend = adjustment;
    }
    else if (adjustment->get_Type() == ShapeAdjustmentType::ConnectorBendPositionY)
    {
        verticalBend = adjustment;
    }
}

if (horizontalBend == nullptr || verticalBend == nullptr)
{
    Console::WriteLine(u"The connector does not expose the expected bend adjustments.");
}
else
{
    horizontalBend->set_RawValue(horizontalBend->get_RawValue() + 20000);
    verticalBend->set_RawValue(verticalBend->get_RawValue() + 200000);

    float x = connector->get_X();
    float y = connector->get_Y();
    auto frame = connector->get_Frame();
    if (frame->get_FlipH() == NullableBool::True)
    {
        x += connector->get_Width();
    }
    if (frame->get_FlipV() == NullableBool::True)
    {
        y += connector->get_Height();
    }

    x += connector->get_Width() * horizontalBend->get_RawValue() / 100000.0f;
    float rotatedX = frame->get_CenterX() - y + frame->get_CenterY();
    float rotatedY = x - frame->get_CenterX() + frame->get_CenterY();
    float segmentWidth = connector->get_Height() * verticalBend->get_RawValue() / 100000.0f;
    auto guide = shapes->AddAutoShape(ShapeType::Rectangle, rotatedX, rotatedY, segmentWidth, 1);
    auto guideLineFillFormat = guide->get_LineFormat()->get_FillFormat();
    guideLineFillFormat->set_FillType(FillType::Solid);
    guideLineFillFormat->get_SolidFillColor()->set_Color(Color::get_Red());

    presentation->Save(u"rotated-connector-segment-guide.pptx", SaveFormat::Pptx);
}

紅色指引線在座標變換後標示出計算出的段落：

這些公式描述了範例中使用的預設，而非通用的連接線模型。在將相同計算應用於其他預設前，請先驗證調整類型、框方向與值範圍。

取得連接線方向角度

可根據直線連接線的寬度與高度（並考慮水平與垂直翻轉）計算其方向角。以下範例回報投影片座標中正水平軸的順時針角度：

#include <DOM/IConnector.h>
#include <DOM/IShapeCollection.h>
#include <DOM/IShapeFrame.h>
#include <DOM/ISlide.h>
#include <DOM/NullableBool.h>
#include <DOM/Presentation.h>
#include <DOM/ShapeType.h>
#include <system/console.h>
#include <system/math.h>

using namespace Aspose::Slides;
using namespace System;

auto presentation = MakeObject<Presentation>();
auto slide = presentation->get_Slide(0);
auto connector = slide->get_Shapes()->AddConnector(ShapeType::StraightConnector1, 100, 100, 200, 100);
auto frame = connector->get_Frame();

bool flipH = frame->get_FlipH() == NullableBool::True;
bool flipV = frame->get_FlipV() == NullableBool::True;
float deltaX = connector->get_Width() * (flipH ? -1 : 1);
float deltaY = connector->get_Height() * (flipV ? -1 : 1);
double angle = Math::Atan2(deltaY, deltaX) * 180.0 / Math::PI;

if (angle < 0)
{
    angle += 360;
}

Console::WriteLine(u"Connector direction: {0:F2} degrees", angle);

常見問題

如何判斷連接線是否能附加到圖形？

檢查圖形的 IShape::get_ConnectionSiteCount 值。正值表示該圖形提供連接點。於指派給任一連接線端點之前，先驗證所選的站點索引。

我可以僅憑集合索引辨識連接線調整點嗎？

索引只有在已知的連接線預設與集合佈局下才有意義。修改值前請先檢查 IAdjustValue::get_Type，當同一語意類型出現多次時，可使用 IAdjustValue::get_Name 作為額外資訊。

當已連接的圖形被刪除時會發生什麼？

對應的連接線端點會變成未附加狀態。連接線仍會保留在投影片上，可自行刪除、作為自由線移動，或重新附加到其他圖形。

複製投影片時會保留連接線的綁定嗎？

在一起複製連接圖形時，綁定通常會被保留。如果僅複製了連接線而未複製其目標圖形，受影響的端點必須重新附加。