How to Add Shapes to PowerPoint in C++

Aspose.Slides FOSS for C++ supports adding AutoShapes, Tables, Connectors, and PictureFrames to presentation slides. All shape types are added through the slide.shapes() collection.

Step-by-Step Guide

Step 1: Build and Link the Library

git clone https://github.com/aspose-slides-foss/Aspose.Slides-FOSS-for-Cpp.git
cd Aspose.Slides-FOSS-for-Cpp && mkdir build && cd build
cmake .. && cmake --build .

Step 2: Create a Presentation

Use stack allocation for RAII cleanup.

#include <Aspose/Slides/Foss/presentation.h>

int main() {
    namespace asf = Aspose::Slides::Foss;

    asf::Presentation prs;
    auto& slide = prs.slides()[0];
    // ... add shapes ...
    prs.save("output.pptx", asf::SaveFormat::PPTX);
    return 0;
}

Step 3: Add an AutoShape

slide.shapes().add_auto_shape(shape_type, x, y, width, height) places a shape at the given position and size (all in points). Use ShapeType constants to select the shape.

#include <Aspose/Slides/Foss/presentation.h>

int main() {
    namespace asf = Aspose::Slides::Foss;

    asf::Presentation prs;
    auto& slide = prs.slides()[0];

    // Rectangle
    auto& rect = slide.shapes().add_auto_shape(
        asf::ShapeType::RECTANGLE, 50, 50, 300, 100);
    rect.add_text_frame("Rectangle shape");

    // Ellipse
    auto& ellipse = slide.shapes().add_auto_shape(
        asf::ShapeType::ELLIPSE, 400, 50, 200, 100);
    ellipse.add_text_frame("Ellipse shape");

    prs.save("autoshapes.pptx", asf::SaveFormat::PPTX);
    return 0;
}

Step 4: Add a Table

slide.shapes().add_table(x, y, col_widths, row_heights) creates a table at the specified position. Column widths and row heights are vectors of point values.

#include <Aspose/Slides/Foss/presentation.h>
#include <vector>
#include <string>

int main() {
    namespace asf = Aspose::Slides::Foss;

    asf::Presentation prs;
    auto& slide = prs.slides()[0];

    std::vector<double> col_widths = {150.0, 150.0, 150.0};
    std::vector<double> row_heights = {40.0, 40.0, 40.0};
    auto& table = slide.shapes().add_table(50, 200, col_widths, row_heights);

    // Set header row text
    std::vector<std::string> headers = {"Product", "Units", "Revenue"};
    for (size_t col = 0; col < headers.size(); ++col) {
        table.rows()[0][col].text_frame().set_text(headers[col]);
    }

    // Set data rows
    std::vector<std::vector<std::string>> rows = {
        {"Widget A", "120", "$2,400"},
        {"Widget B", "85",  "$1,700"},
    };
    for (size_t r = 0; r < rows.size(); ++r) {
        for (size_t c = 0; c < rows[r].size(); ++c) {
            table.rows()[r + 1][c].text_frame().set_text(rows[r][c]);
        }
    }

    prs.save("table.pptx", asf::SaveFormat::PPTX);
    return 0;
}

Step 5: Add a Connector

Connectors link two shapes visually. Create the shapes first, then add a connector and set its start and end connection points.

#include <Aspose/Slides/Foss/presentation.h>

int main() {
    namespace asf = Aspose::Slides::Foss;

    asf::Presentation prs;
    auto& slide = prs.slides()[0];

    auto& box1 = slide.shapes().add_auto_shape(
        asf::ShapeType::RECTANGLE, 50, 100, 150, 60);
    box1.add_text_frame("Start");

    auto& box2 = slide.shapes().add_auto_shape(
        asf::ShapeType::RECTANGLE, 350, 100, 150, 60);
    box2.add_text_frame("End");

    auto& conn = slide.shapes().add_connector(
        asf::ShapeType::BENT_CONNECTOR3, 0, 0, 10, 10);
    conn.set_start_shape_connected_to(box1);
    conn.set_start_shape_connection_site_index(3); // right side of box1
    conn.set_end_shape_connected_to(box2);
    conn.set_end_shape_connection_site_index(1);   // left side of box2

    prs.save("connector.pptx", asf::SaveFormat::PPTX);
    return 0;
}

Connection site indices are numbered 0-3 for a rectangle: top=0, left=1, bottom=2, right=3.

Step 6: Add a Picture Frame

Embed an image and add it to the slide as a PictureFrame. Read the image bytes first, add them to the presentation’s image collection, then create the frame.

#include <Aspose/Slides/Foss/presentation.h>
#include <fstream>
#include <vector>

int main() {
    namespace asf = Aspose::Slides::Foss;

    asf::Presentation prs;

    std::ifstream file("logo.png", std::ios::binary);
    std::vector<uint8_t> data((std::istreambuf_iterator<char>(file)),
                               std::istreambuf_iterator<char>());

    auto& image = prs.images().add_image(data);

    auto& slide = prs.slides()[0];
    slide.shapes().add_picture_frame(
        asf::ShapeType::RECTANGLE, // bounding shape type
        50, 50,                    // x, y in points
        200, 150,                  // width, height in points
        image);

    prs.save("with-image.pptx", asf::SaveFormat::PPTX);
    return 0;
}

Common Issues and Fixes

Shape appears outside the visible slide area

Slides are 720 x 540 points by default. Values of x or y beyond those bounds place the shape off-slide. Keep x < 720 and y < 540, and ensure x + width <= 720 and y + height <= 540.

add_auto_shape() returns a reference to a destroyed object

Do not store references beyond the lifetime of the Presentation. All child objects are owned by the Presentation and invalidated on destruction.

Table cell text is empty after assignment

The correct method is .text_frame().set_text(). Access cells as table.rows()[row_index][col_index].text_frame().set_text("value").

Frequently Asked Questions

How many shapes can I add to a slide?

There is no library-imposed limit. Practical limits depend on file size and the rendering capability of your target PPTX viewer.

Can I change a shape’s position after adding it?

Yes. The shape object returned by add_auto_shape() has set_x(), set_y(), set_width(), and set_height() methods:

shape.set_x(100);
shape.set_y(200);
shape.set_width(400);
shape.set_height(80);

Can I set the shape outline (border) color?

Yes, via shape.line_format():

shape.line_format().fill_format().solid_fill_color().set_color(
    asf::Color::from_argb(255, 200, 0, 0));

Are charts supported?

No. Charts, SmartArt, and OLE objects are not implemented in this edition.