I'm working on a Delphi class to import/export some kind of entities from DXF file. I'd like add support for Image entity but I don't understand some group codes. I'm using official DXF guide reference (2002): I have understand the group codes 10, 20 and 30, there are the 'Insertion point' and work like any other entities.
The problem are group codes: -11, 21 and 31: U-vector of a single pixel (points along the visual bottom of the image, starting at the insertion point) (in WCS); -12, 22 and 32: V-vector of a single pixel (points along the visual left side of the image, starting at the insertion point) (in WCS); I think DXF use it for scale and rotation but I don't have understand how. These group codes are used for controlling the rotation and scale of the image.
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Group codes 10, 20 and 30 control the insertion point of the lower left corner of your image. The group codes 11, 21 and 31 are used to define a vector in 3D space that is the endpoint of a line whose start point is assumed to be 0,0,0, regardless of the origin point of the image. These group codes describe a relative vector. This relative vector (for a scale factor of 1) is constrained by a circle whose radius is the square root of 1/8, or 0.352733677. For example, an image inserted with no rotation, and a scale factor of 1, would have 11, 21, 31 group code values of 0.352733677,0,0 respectively. An image inserted with no rotation, and a scale factor of 2, would have 11, 21, 31 group code values of 0.,0,0 respectively. An image inserted with a 45 degree rotation and a scale factor of 1, would have 11, 21, 31 group codes of 0.25,0.25,0 respectively.
Which is an oddly even number, but that's the way the math works out. The scale factor is a multiplier of the circle whose radius is sqrt(1/8). Once you have this radius based on the scale factor, you can determine the '11' and '21' values using sin and cos of the rotation angle. The 12, 22, 32 group codes have similar values, but for the left edge of the image.
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The same math would be used to determine their values. It seems like over-constraining the image, but that's the way the specification works. EDIT The above answer is only valid for a raster image saved at 72 dpi and then inserted into a metric (millimeter scale) drawing.
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Group code value types. Group value type. String (with the introduction of extended symbol names in AutoCAD 2000, the 255-character limit has been increased to 2049 single-byte characters not including the newline at the end of the line). Group codes define a specific value of an entity. The maximum number of characters a value can have is 256. The file structure is composed of a header section, a classes section, a tables section, a blocks section, an entities section, and an objects section. Sylo music player for mac.