Add image support for worksheets (PNG, JPEG, GIF, SVG) #578
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This adds the ability to embed images in worksheet cells with support for: - PNG, JPEG, GIF raster formats with automatic detection via byte headers - SVG vector format (Office 2016+) with automatic detection - One-cell anchoring (fixed size at cell position) - Two-cell anchoring (image spans and resizes with cell range) - Custom anchoring with pixel offsets via PictureAnchor New classes: - ImageType: Enum for supported formats with byte header detection - Picture: Represents an embedded image with XML writing - PictureAnchor: EMU-based positioning (one-cell/two-cell anchors) - Pictures: Collection manager for worksheet images API additions to Worksheet: - addImage(row, col, imageData, widthPx, heightPx) - one-cell anchor - addImage(fromRow, fromCol, toRow, toCol, imageData) - two-cell anchor - addImage(anchor, imageData) - custom anchor - addImage(anchor, imageData, name, lockAspectRatio) - full control Images coexist properly with comments (separate drawing relationships). Includes comprehensive unit tests with Apache POI validation.
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This adds the ability to embed images in worksheet cells with support for:
New classes:
API additions to Worksheet:
Images coexist properly with comments (separate drawing relationships). Includes comprehensive unit tests with Apache POI validation.