【转帖】dwg to svg export world coordinates
 

dwg to svg: export "world" coordinates
dwg to svg: export "world" coordinates
hi,
i recently developed a library to convert dwg to svg, based on the example given in svgexport. so that the drawing exactly fits the output box, i zoomed it to extents and called wrapper->onsize with height and width (in pixels) that have the same ratio as my extents height and width (in "world" coordinates). it works fine.
i wanted to be able to dynamically show/hide external custom areas whose coordinates are defined in "world" referential (by the mean of a javascript on the svg drawing).
i discovered that during export from dwg to svg, all coordinates are converted from "world" (double) to "device" (long) referential.
i could call wrapper->onsize with exactly my extents coordinates (in "world" units) casted to long, but i would loose decimals and all coordinates would be recomputed anyway, and i dont' want it.
i could also export my extents coordinates as a hidden field, that i could use in javascript to perform referential conversion, but i don't like it either.
is there any smarter way to export the original coordinates ?
(no need to mention that svg drawings can have viewbox coordinates with decimals).
regards,
guillaume
what do you mean by original coordinates? dwg world coordinates?
what about paperspaces with multiple viewports?]
quote:
coordinates are converted from "world" (double) to "device" (long) referential.
coordinates are transformed by woldtodevice matrix. you have full control over it.
i do not quite understand your need, but it looks like, you may try to set eyetodevice martix to identity first.
vladimir