使用 JavaScript 在演示文稿中管理连接器

本页内容简介

了解如何通过 Java 使用 Aspose.Slides for Node.js 添加、附加、重新路由、调整和检查 PowerPoint 中的直线、弯折和曲线连接器。

概述

连接器是一条线，在任一形状移动时仍可保持连接到两个形状。其两端连接到连接点，在 PowerPoint 中表现为绿色点。某些弯曲和曲线连接器还会显示调整点，表现为橙色点，用于控制各连接段的位置。

Aspose.Slides 通过 Connector 类来表示连接器。您可以创建它们、将两端附加到形状、选择连接点、重新路由以及修改具有调整点的连接器的几何形状。

连接器类型

ShapeType 类包括直线、弯折和曲线连接器预设。下表显示了可用的连接器几何形状以及每个预设定义的调整点数量。

Connector	Image	调整点数量
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

调整点的数量和含义是所选连接器预设的一部分。不要假设两种不同的连接器类型会暴露相同的集合布局。

连接两个形状

使用 ShapeCollection.addConnector 添加连接器，并使用 Connector.setStartShapeConnectedTo 和 Connector.setEndShapeConnectedTo 将其两端附加。两端都附加后，使用 Connector.reroute 在形状之间选择一条短路径。

下面的示例使用弯折连接器将椭圆和矩形连接起来：

const aspose = { slides: require("aspose.slides.via.java") };

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    const ellipse = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Ellipse, 40, 80, 120, 80);
    const rectangle = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 320, 240, 140, 80);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector2, 0, 0, 10, 10);

    connector.setStartShapeConnectedTo(ellipse);
    connector.setEndShapeConnectedTo(rectangle);
    connector.reroute();

    presentation.save("connected-shapes.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

Warning

调用 reroute 可能会更改 setStartShapeConnectionSiteIndex 和 setEndShapeConnectionSiteIndex 的值。如果这些连接点必须保持固定，请在重新路由后分配特定的连接点。

选择连接点

每个可连接的形状通过 Shape.getConnectionSiteCount 报告其连接点数量。在将首选的零基索引分配给连接器两端之前，需要验证该索引；不同形状的几何形状导致连接点数量不同。

以下示例在椭圆上存在该连接点时，将连接器附加到椭圆的特定连接点：

const aspose = { slides: require("aspose.slides.via.java") };

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    const ellipse = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Ellipse, 40, 80, 120, 80);
    const rectangle = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 320, 240, 140, 80);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector3, 0, 0, 10, 10);

    connector.setStartShapeConnectedTo(ellipse);
    connector.setEndShapeConnectedTo(rectangle);

    const preferredSiteIndex = 2;
    if (preferredSiteIndex < ellipse.getConnectionSiteCount()) {
        connector.setStartShapeConnectionSiteIndex(preferredSiteIndex);
    } else {
        console.log(`The ellipse has only ${ellipse.getConnectionSiteCount()} connection sites.`);
    }

    presentation.save("specific-connection-site.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

调整连接器点

具有调整点的连接器通过 GeometryShape.getAdjustments 暴露这些点。在使用 setRawValue 更改之前，检查每个 AdjustValue 并检查其 getType 的值。有关识别预设形状调整的通用规则，请参阅 Shape Manipulation。

连接器调整的数量、顺序、含义及有效值范围取决于连接器预设。调整类型是只读的，而调整值是可写的。当连接器包含多个相同语义类型的调整时，只读的 getName 方法提供额外的标识。

绕过障碍物

在下面的布局中，两个形状之间的 BentConnector5 连接器穿过第三个形状：

以下代码创建了受阻的连接器：

const aspose = { slides: require("aspose.slides.via.java") };
const java = require("java");

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 300, 150, 150, 75);
    const sourceShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 500, 400, 100, 50);
    const targetShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 70, 30);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector5, 20, 20, 400, 300);

    const black = java.getStaticFieldValue("java.awt.Color", "BLACK");
    const solidFillType = java.newByte(aspose.slides.FillType.Solid);
    const triangleArrowheadStyle = java.newByte(aspose.slides.LineArrowheadStyle.Triangle);
    connector.getLineFormat().setEndArrowheadStyle(triangleArrowheadStyle);
    connector.getLineFormat().getFillFormat().setFillType(solidFillType);
    connector.getLineFormat().getFillFormat().getSolidFillColor().setColor(black);
    connector.setStartShapeConnectedTo(sourceShape);
    connector.setEndShapeConnectedTo(targetShape);
    connector.setStartShapeConnectionSiteIndex(2);

    presentation.save("connector-obstruction.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

移动垂直弯曲会改变路径，使连接器绕过障碍物：

本例并未假设集合索引 1 总是代表垂直弯曲，而是搜索 ConnectorBendPositionY，并仅在存在预期语义类型时进行更改：

const aspose = { slides: require("aspose.slides.via.java") };
const java = require("java");

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 300, 150, 150, 75);
    const sourceShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 500, 400, 100, 50);
    const targetShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 70, 30);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector5, 20, 20, 400, 300);

    const black = java.getStaticFieldValue("java.awt.Color", "BLACK");
    const solidFillType = java.newByte(aspose.slides.FillType.Solid);
    const triangleArrowheadStyle = java.newByte(aspose.slides.LineArrowheadStyle.Triangle);
    connector.getLineFormat().setEndArrowheadStyle(triangleArrowheadStyle);
    connector.getLineFormat().getFillFormat().setFillType(solidFillType);
    connector.getLineFormat().getFillFormat().getSolidFillColor().setColor(black);
    connector.setStartShapeConnectedTo(sourceShape);
    connector.setEndShapeConnectedTo(targetShape);
    connector.setStartShapeConnectionSiteIndex(2);

    let verticalBend = null;
    for (let adjustmentIndex = 0; adjustmentIndex < connector.getAdjustments().size(); adjustmentIndex++) {
        const adjustment = connector.getAdjustments().get_Item(adjustmentIndex);
        console.log(`${adjustment.getName()}: ${adjustment.getType()}, raw value = ${adjustment.getRawValue()}`);
        if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionY) {
            verticalBend = adjustment;
            break;
        }
    }

    if (verticalBend === null) {
        console.log("The connector does not expose a vertical bend adjustment.");
    } else {
        verticalBend.setRawValue(60000);
        presentation.save("connector-obstruction-fixed.pptx", aspose.slides.SaveFormat.Pptx);
    }
} finally {
    presentation.dispose();
}

BentConnector5 包含两个 ConnectorBendPositionX 调整和一个 ConnectorBendPositionY 调整。如果所需类型出现多次，请在选择前检查 getName 以及该预设的已知几何形状。若某个调整报告为 ShapeAdjustmentType.Custom，则其含义和范围视为特定于预设，在明确该约定之前不要更改。

将调整值关联到连接器几何

对于弯折连接器，调整值可用于估算各段的位置。这些计算特定于连接器预设：

• BentConnector4 通常暴露一个 ConnectorBendPositionX 和一个 ConnectorBendPositionY 调整。
• 对于这些弯曲位置，将 getRawValue 返回的值除以 100000 可得到连接器框宽度或高度的比例，如下例所示。
• 连接器框可能被旋转或翻转，因此在与幻灯片坐标比较之前必须对框坐标进行转换。

以下示例首先使用 getType 来识别调整。它们不将集合索引视为通用标识符。

未旋转的连接器

初始布局包含两个由 BentConnector4 连接的文本形状：

本例检查连接器并获取其水平和垂直弯曲调整：

const aspose = { slides: require("aspose.slides.via.java") };
const java = require("java");

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    const sourceShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 60, 25);
    sourceShape.getTextFrame().setText("From");
    const targetShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 500, 100, 60, 25);
    targetShape.getTextFrame().setText("To");
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector4, 20, 20, 400, 300);

    const red = java.getStaticFieldValue("java.awt.Color", "RED");
    const solidFillType = java.newByte(aspose.slides.FillType.Solid);
    const triangleArrowheadStyle = java.newByte(aspose.slides.LineArrowheadStyle.Triangle);
    connector.getLineFormat().setEndArrowheadStyle(triangleArrowheadStyle);
    connector.getLineFormat().getFillFormat().setFillType(solidFillType);
    connector.getLineFormat().getFillFormat().getSolidFillColor().setColor(red);
    connector.getLineFormat().setWidth(3);
    connector.setStartShapeConnectedTo(sourceShape);
    connector.setStartShapeConnectionSiteIndex(3);
    connector.setEndShapeConnectedTo(targetShape);
    connector.setEndShapeConnectionSiteIndex(2);

    for (let adjustmentIndex = 0; adjustmentIndex < connector.getAdjustments().size(); adjustmentIndex++) {
        const adjustment = connector.getAdjustments().get_Item(adjustmentIndex);
        console.log(`${adjustment.getName()}: ${adjustment.getType()}, raw value = ${adjustment.getRawValue()}`);
    }
} finally {
    presentation.dispose();
}

要更改两个弯曲，请定位每个预期类型，并在找到两者后再修改其值：

const aspose = { slides: require("aspose.slides.via.java") };

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    const sourceShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 60, 25);
    const targetShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 500, 100, 60, 25);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector4, 20, 20, 400, 300);
    connector.setStartShapeConnectedTo(sourceShape);
    connector.setStartShapeConnectionSiteIndex(3);
    connector.setEndShapeConnectedTo(targetShape);
    connector.setEndShapeConnectionSiteIndex(2);

    let horizontalBend = null;
    let verticalBend = null;
    for (let adjustmentIndex = 0; adjustmentIndex < connector.getAdjustments().size(); adjustmentIndex++) {
        const adjustment = connector.getAdjustments().get_Item(adjustmentIndex);
        if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionX) {
            horizontalBend = adjustment;
        } else if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionY) {
            verticalBend = adjustment;
        }
    }

    if (horizontalBend === null || verticalBend === null) {
        console.log("The connector does not expose the expected bend adjustments.");
    } else {
        horizontalBend.setRawValue(horizontalBend.getRawValue() + 20000);
        verticalBend.setRawValue(verticalBend.getRawValue() + 200000);
        presentation.save("connector-adjusted.pptx", aspose.slides.SaveFormat.Pptx);
    }
} finally {
    presentation.dispose();
}

结果是连接器的水平和垂直段已移动：

确定语义类型后，其值可转换为连接器框坐标。本例在由两个弯曲调整控制的垂直段上绘制一个细长矩形：

const aspose = { slides: require("aspose.slides.via.java") };
const java = require("java");

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    const sourceShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 60, 25);
    const targetShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 500, 100, 60, 25);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector4, 20, 20, 400, 300);
    connector.setStartShapeConnectedTo(sourceShape);
    connector.setStartShapeConnectionSiteIndex(3);
    connector.setEndShapeConnectedTo(targetShape);
    connector.setEndShapeConnectionSiteIndex(2);

    let horizontalBend = null;
    let verticalBend = null;
    for (let adjustmentIndex = 0; adjustmentIndex < connector.getAdjustments().size(); adjustmentIndex++) {
        const adjustment = connector.getAdjustments().get_Item(adjustmentIndex);
        if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionX) {
            horizontalBend = adjustment;
        } else if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionY) {
            verticalBend = adjustment;
        }
    }

    if (horizontalBend === null || verticalBend === null) {
        console.log("The connector does not expose the expected bend adjustments.");
    } else {
        const x = connector.getX() + connector.getWidth() * horizontalBend.getRawValue() / 100000;
        const y = connector.getY();
        const height = connector.getHeight() * verticalBend.getRawValue() / 100000;
        const guideX = java.newFloat(x);
        const guideY = java.newFloat(y);
        const guideWidth = java.newFloat(1);
        const guideHeight = java.newFloat(height);
        slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, guideX, guideY, guideWidth, guideHeight);
        presentation.save("connector-segment-guide.pptx", aspose.slides.SaveFormat.Pptx);
    }
} finally {
    presentation.dispose();
}

旋转或翻转的连接器

当相同的连接器几何垂直放置时，其 Shape.getFrame, ShapeFrame.getFlipH, 和 ShapeFrame.getFlipV 值会影响从连接器框坐标到幻灯片坐标的转换。

本例创建并调整垂直方向的连接器：

const aspose = { slides: require("aspose.slides.via.java") };
const java = require("java");

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    const sourceShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 60, 25);
    sourceShape.getTextFrame().setText("From");
    const targetShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 400, 60, 25);
    targetShape.getTextFrame().setText("To 1");
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector4, 20, 20, 400, 300);

    const connectorColor = java.newInstanceSync("java.awt.Color", 102, 205, 170);
    const solidFillType = java.newByte(aspose.slides.FillType.Solid);
    const triangleArrowheadStyle = java.newByte(aspose.slides.LineArrowheadStyle.Triangle);
    connector.getLineFormat().setEndArrowheadStyle(triangleArrowheadStyle);
    connector.getLineFormat().getFillFormat().setFillType(solidFillType);
    connector.getLineFormat().getFillFormat().getSolidFillColor().setColor(connectorColor);
    connector.getLineFormat().setWidth(3);
    connector.setStartShapeConnectedTo(sourceShape);
    connector.setStartShapeConnectionSiteIndex(2);
    connector.setEndShapeConnectedTo(targetShape);
    connector.setEndShapeConnectionSiteIndex(3);

    for (let adjustmentIndex = 0; adjustmentIndex < connector.getAdjustments().size(); adjustmentIndex++) {
        const adjustment = connector.getAdjustments().get_Item(adjustmentIndex);
        if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionX) {
            adjustment.setRawValue(adjustment.getRawValue() + 20000);
        } else if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionY) {
            adjustment.setRawValue(adjustment.getRawValue() + 200000);
        }
    }

    presentation.save("vertical-connector-adjusted.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

对于任意旋转角度 alpha，将连接器框点 (x, y) 绕框中心 (x0, y0) 旋转：

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

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

以下代码处理本例中使用的 90 度方向，并在相应的连接器段上绘制红色指示线：

const aspose = { slides: require("aspose.slides.via.java") };
const java = require("java");

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);

    const sourceShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 60, 25);
    const targetShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 400, 60, 25);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.BentConnector4, 20, 20, 400, 300);
    connector.setStartShapeConnectedTo(sourceShape);
    connector.setStartShapeConnectionSiteIndex(2);
    connector.setEndShapeConnectedTo(targetShape);
    connector.setEndShapeConnectionSiteIndex(3);

    let horizontalBend = null;
    let verticalBend = null;
    for (let adjustmentIndex = 0; adjustmentIndex < connector.getAdjustments().size(); adjustmentIndex++) {
        const adjustment = connector.getAdjustments().get_Item(adjustmentIndex);
        if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionX) {
            horizontalBend = adjustment;
        } else if (adjustment.getType() === aspose.slides.ShapeAdjustmentType.ConnectorBendPositionY) {
            verticalBend = adjustment;
        }
    }

    if (horizontalBend === null || verticalBend === null) {
        console.log("The connector does not expose the expected bend adjustments.");
    } else {
        horizontalBend.setRawValue(horizontalBend.getRawValue() + 20000);
        verticalBend.setRawValue(verticalBend.getRawValue() + 200000);

        let x = connector.getX();
        let y = connector.getY();
        if (connector.getFrame().getFlipH() === aspose.slides.NullableBool.True) {
            x += connector.getWidth();
        }
        if (connector.getFrame().getFlipV() === aspose.slides.NullableBool.True) {
            y += connector.getHeight();
        }

        x += connector.getWidth() * horizontalBend.getRawValue() / 100000;
        const rotatedX = connector.getFrame().getCenterX() - y + connector.getFrame().getCenterY();
        const rotatedY = x - connector.getFrame().getCenterX() + connector.getFrame().getCenterY();
        const segmentWidth = connector.getHeight() * verticalBend.getRawValue() / 100000;
        const guideX = java.newFloat(rotatedX);
        const guideY = java.newFloat(rotatedY);
        const guideWidth = java.newFloat(segmentWidth);
        const guideHeight = java.newFloat(1);
        const guide = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, guideX, guideY, guideWidth, guideHeight);
        const red = java.getStaticFieldValue("java.awt.Color", "RED");
        const solidFillType = java.newByte(aspose.slides.FillType.Solid);
        guide.getLineFormat().getFillFormat().setFillType(solidFillType);
        guide.getLineFormat().getFillFormat().getSolidFillColor().setColor(red);

        presentation.save("rotated-connector-segment-guide.pptx", aspose.slides.SaveFormat.Pptx);
    }
} finally {
    presentation.dispose();
}

红色指示线标记了坐标转换后的计算段：

这些公式描述了示例中使用的预设，而非通用的连接器模型。在将相同计算应用于不同预设之前，请验证调整类型、框方向和数值范围。

查找连接器方向角度

直线连接器的方向可根据其宽度和高度计算，同时考虑水平和垂直翻转。以下示例报告了幻灯片坐标系中正水平轴的顺时针角度：

const aspose = { slides: require("aspose.slides.via.java") };

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);
    const connector = slide.getShapes().addConnector(aspose.slides.ShapeType.StraightConnector1, 100, 100, 200, 100);

    const flipH = connector.getFrame().getFlipH() === aspose.slides.NullableBool.True;
    const flipV = connector.getFrame().getFlipV() === aspose.slides.NullableBool.True;
    const deltaX = connector.getWidth() * (flipH ? -1 : 1);
    const deltaY = connector.getHeight() * (flipV ? -1 : 1);
    let angle = Math.atan2(deltaY, deltaX) * 180.0 / Math.PI;

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

    console.log(`Connector direction: ${angle.toFixed(2)} degrees`);
} finally {
    presentation.dispose();
}

常见问题

如何判断连接器是否可以附加到形状上？

检查形状的 getConnectionSiteCount 值。正数表示该形状提供连接点。在将其分配给任一连接器端之前，请验证所选的连接点索引。

我能通过集合索引识别连接器的调整吗？

索引仅在已知的连接器预设和集合布局下才有意义。修改值之前请检查 AdjustValue.getType，当相同语义类型出现多次时，可使用 AdjustValue.getName 获取额外信息。

当已连接的形状被删除时会怎样？

相应的连接器端会被分离。连接器仍保留在幻灯片上，可被删除、作为自由线定位，或重新附加到其他形状。

复制幻灯片时会保留连接器的绑定吗？

当与幻灯片一起复制已连接的形状时，绑定通常会保留。如果仅复制了连接器而未复制其目标形状，则需要重新附加受影响的端。