| This PR adds support of Ordinate dimension. |
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| #### Generic support of the Ordinate Dimension |
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| Demo: https://youtu.be/56kGlFMSZlg |
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| Common functionality related to Ordinate Dimension was added: |
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| 1) Ordinate Dimension entity added (for x and y ordinates) |
| 2) Support of ordinate dimension entity was added to DXF reading/writing |
| 3) Ordinate dimension properties dialog added |
| 4) Support of ordinate dimension was added to informational cursor and entity info widget. |
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| Ordinate dimensions supports both WCS and UCS. |
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| #### Related actions |
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| Several actions related to ordinate dimensions were added (located in Dimensions group): |
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| 1) Ordinate - the text command is **"dimord"**. Allows to create new ordinate dimension. |
| The origin/definition point of the dimension - zero (0,0) point is located in the origin of the current Coordinate System (UCS or WCS). |
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| Therefore, before creation of ordinate dimensions, a proper UCS should be set. |
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| 2) Select Ordinates by base - allows the user to pick one ordinate dimension and select all ordinate dimensions within drawing with the same defining point and direction of horizontal. |
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| 3) Ordinates Re-base - (command is **"dimordrebase"**). Allows to set the defining point for selected ordinate dimensions to the origin point of the current UCS. |
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| This command is useful for editing ordinate dimensions, if either base point was changed, or if dimension entities were moved. |
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| 4) "Set UCS by Ordinate Dimension" - this action allows the user to set the UCS that corresponds the defining point and horizontal angle of the selected Ordinate Dimension. |
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| ### Other changes |
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| 1) Small fix for styling of linear dimensions line (if the text is inline of dimension line) |
| 2) Very initial support for DIMSTYLES (this is work in progress) |
| 3) Very initial support of other dimension-related entities (also WIP) |
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| In general, the next PR will include more changes for dimension entities and actions are planned. |
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| ### Small Fixes |
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