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<div class="container"> |
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<h1>DRC Function Internals</h1> |
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<ul> |
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<li><a href="#drc_function_details">DRC Function Details</a></li> |
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<li><a href="#edge_orientation">Edge Orientation and Edge-based Checks</a></li> |
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</ul> |
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<p> |
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This document describes some of the DRC functions in detail, specifically with respect to |
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deep mode and pre-merge behavior. |
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</p> |
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<a name="drc_function_details"/> |
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<h2>DRC Function Details</h2> |
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<p> |
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In the table below <b>A</b> is for the first operand in binary operators of <tt>self</tt> for methods. |
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<b>B</b> is for the second operand or the first method argument. For example: |
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</p> |
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<pre> |
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# A is self |
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result = A.interacting(B) |
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# A is first operand in binary operators |
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result = A - B |
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</pre> |
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<p> |
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Further columns include: |
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</p> |
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<ul> |
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<li><b>Type</b>: layers can be polygon, edge, edge pair or text layers. Depending on |
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the type, operations can behave differently.</li> |
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<li><b>Pre-merge</b>: some operations mandate pre-merging. Pre-merging means, that |
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clusters of shapes are combined into larger polygons and internal edges are removed. |
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After pre-merge, polygons to not touch or overlap. Pre-merged polygons are |
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placed in the hierarchy on the first level where these polygons are complete. |
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Pre-merging therefore often accounts for hierarchy degradation. Pre-merging |
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can add a considerable performance overhead.<br/> |
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For edge layers, pre-merging is also applied. In that case, collinear edges are |
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combined into single ones.<br/> |
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Pre-merging is not applied to layers that are merged already, specifically |
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layers that a the result of an operation that delivers merged layers. Pre-merging |
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is also referred to as "merged semantics" and can be suppressed by using "raw" mode |
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(merged semantics off).</li> |
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<li><b>Primary input</b>: the primary input of an operation determines the |
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hierarchy level on which the results are evaluated. Less shapes on the primary |
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layer mean less work for the CPU. It can be beneficial to use the more hierarchical |
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layer for the primary input as this means that evaluation will happen deeper |
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inside the hierarchy and therefore potentially with a better hierarchy utilization.</li> |
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<li><b>Range</b>: some operations have an interaction range - that is the distance |
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by which the function needs to search for neighbor shapes it has to include. |
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Longer interaction ranges mean more search effort and potentially higher complexity. |
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For a uniform shape density complexity increases with the square of the range.</li> |
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</ul> |
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<p> |
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Please see the comment column for further details. |
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</p> |
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<table> |
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<tr><th>Function</th><th>Type</th><th>Pre-merge</th><th>Result merged</th><th>Range</th><th>Primary input</th><th>Comment</th></tr> |
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<tr> |
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<td><tt>with_*</tt> and <tt>without_*</tt></td> |
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<td>polygon or edge</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td>Polygon predicates (<tt>rectangles</tt>, <tt>squares</tt>, <tt>rectilinear</tt> and related <tt>non_*</tt> methods)</td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>holes</tt> and <tt>hulls</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>end_segments</tt>, <tt>start_segments</tt> and <tt>centers</tt></td> |
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<td>edge</td> |
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<td>yes</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>extended</tt>, <tt>extended_in</tt> and <tt>extended_out</tt></td> |
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<td>edge</td> |
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<td>yes</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>edges</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>first_edges</tt> and <tt>second_edges</tt></td> |
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<td>edge pair</td> |
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<td>n/a</td> |
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<td>n/a</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>bbox</tt></td> |
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<td>any</td> |
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<td>no</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>area</tt>, <tt>perimeter</tt>, <tt>is_box?</tt> and <tt>length</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>n/a</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>flatten</tt></td> |
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<td>any</td> |
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<td>no</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>select</tt>, <tt>each</tt> and <tt>collect*</tt></td> |
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<td>polygon or edge</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>rounded_corners</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>smoothed</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>corners</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>middle</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>extent_refs</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>yes</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>ongrid</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td>Reverts to flat mode for anisotropic grids.</td> |
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</tr> |
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<tr> |
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<td><tt>odd_polygons</tt></td> |
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<td>polygon</td> |
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<td>no</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>snap</tt> and <tt>snapped</tt></td> |
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<td>polygon</td> |
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<td>yes</td> |
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<td>no</td> |
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<td></td> |
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<td></td> |
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<td>Creates cell variants. Reverts to flat mode for anisotropic grids.</td> |
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</tr> |
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<tr> |
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<td><tt>and</tt> and <tt>not</tt> (<tt>&</tt> and <tt>-</tt> operators)</td> |
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<td>polygon and edge</td> |
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<td>no</td> |
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<td>no</td> |
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<td>0</td> |
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<td>A</td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>andnot</tt></td> |
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<td>polygon and edge</td> |
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<td>no</td> |
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<td>no</td> |
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<td>0</td> |
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<td>A</td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>xor</tt> (<tt>^</tt> operator)</td> |
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<td>polygon and edge</td> |
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<td>no</td> |
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<td>no</td> |
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<td>0</td> |
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<td>both</td> |
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<td>Basically implemented as <tt>(A-B)+(B-A)</tt>.</td> |
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</tr> |
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<tr> |
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<td><tt>or</tt> (<tt>|</tt> operator)</td> |
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<td>polygon and edge</td> |
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<td>no</td> |
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<td>yes</td> |
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<td>0</td> |
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<td>both</td> |
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<td>Basically implemented as <tt>(A+B).merged</tt>.</td> |
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</tr> |
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<tr> |
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<td><tt>join</tt> (<tt>+</tt> operator)</td> |
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<td>polygon and edge</td> |
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<td>no</td> |
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<td>no</td> |
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<td>0</td> |
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<td>both</td> |
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<td>Cheap operation. Performs hierarchy mapping of B to A in case both inputs come from different hierarchies.</td> |
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</tr> |
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<tr> |
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<td><tt>covering</tt> and related (<tt>not_covering</tt>, <tt>split_covering</tt>, <tt>select_covering</tt>, <tt>select_not_covering</tt>)</td> |
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<td>polygon</td> |
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<td>yes (A, B if counting)</td> |
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<td>yes</td> |
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<td>0</td> |
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<td>A</td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>overlapping</tt> and related (<tt>not_overlapping</tt>, <tt>split_overlapping</tt>, <tt>select_overlapping</tt>, <tt>select_not_overlapping</tt>)</td> |
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<td>polygon</td> |
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<td>yes (A, B if counting)</td> |
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<td>yes</td> |
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<td>0</td> |
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<td>A</td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>interacting</tt> and related (<tt>not_interacting</tt>, <tt>split_interacting</tt>, <tt>select_interacting</tt>, <tt>select_not_interacting</tt>)</td> |
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<td>polygon and edge</td> |
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<td>yes (A, B if counting)</td> |
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<td>yes</td> |
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<td>0</td> |
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<td>A</td> |
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<td></td> |
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</tr> |
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<tr> |
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<td><tt>pull_interacting</tt></td> |
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<td>polygon, edge and text</td> |
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<td>yes (B)</td> |
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<td>yes</td> |
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<td>0</td> |
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<td>A</td> |
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<td>Can be used to re-hierarchise <b>B</b> along hierarchy of <b>A</b> (put B into raw mode to disable merging).</td> |
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</tr> |
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<tr> |
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<td><tt>pull_overlapping</tt></td> |
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<td>polygon</td> |
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<td>yes (B)</td> |
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<td>yes</td> |
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<td>0</td> |
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<td>A</td> |
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<td>Can be used to re-hierarchise <b>B</b> along hierarchy of <b>A</b> (put B into raw mode to disable merging).</td> |
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</tr> |
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<tr> |
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<td><tt>pull_inside</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>yes (A, B)</td> |
|
|
<td>yes</td> |
|
|
<td>0</td> |
|
|
<td>A</td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>inside</tt> and related (<tt>not_inside</tt>, <tt>split_inside</tt>, <tt>select_inside</tt>, <tt>select_not_inside</tt>)</td> |
|
|
<td>polygon and edge</td> |
|
|
<td>yes (A)</td> |
|
|
<td>yes</td> |
|
|
<td>0</td> |
|
|
<td>A</td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>in</tt> and related (<tt>not_in</tt>, <tt>in_and_out</tt>)</td> |
|
|
<td>polygon and edge</td> |
|
|
<td>yes (A, B)</td> |
|
|
<td>yes</td> |
|
|
<td>0</td> |
|
|
<td>A</td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>intersections</tt></td> |
|
|
<td>edge</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td>0</td> |
|
|
<td>A</td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>inside_part</tt>, <tt>outside_part</tt> and <tt>inside_outside_part</tt></td> |
|
|
<td>edge (A), polygon (B)</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td>0</td> |
|
|
<td>A</td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>width</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>yes</td> |
|
|
<td>n/a</td> |
|
|
<td>0</td> |
|
|
<td></td> |
|
|
<td>Single polygon check, no neighbors needed.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>space</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>no/yes</td> |
|
|
<td>n/a</td> |
|
|
<td>check value</td> |
|
|
<td></td> |
|
|
<td>Pre-merge is needed for: whole edges, rectangle filters, opposite filters and projection filters.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>notch</tt> and <tt>isolated</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>yes</td> |
|
|
<td>n/a</td> |
|
|
<td>check value</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>separation</tt>, <tt>overlap</tt>, <tt>enclosing</tt> and <tt>enclosed</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>no/yes</td> |
|
|
<td>n/a</td> |
|
|
<td>check value</td> |
|
|
<td>A</td> |
|
|
<td>Pre-merge of <b>A</b> is needed for: whole edges, rectangle filters, opposite filters and projection filters. |
|
|
Pre-merge of <b>B</b> is needed for: whole edges.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>width</tt> and <tt>space</tt></td> |
|
|
<td>edge</td> |
|
|
<td>yes</td> |
|
|
<td>n/a</td> |
|
|
<td>check value</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>separation</tt>, <tt>overlap</tt>, <tt>enclosing</tt> and <tt>enclosed</tt></td> |
|
|
<td>edge</td> |
|
|
<td>yes (A)</td> |
|
|
<td>n/a</td> |
|
|
<td>check value</td> |
|
|
<td>A</td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>with_density</tt> and <tt>without_density</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>yes</td> |
|
|
<td>n/a</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td>Runs in tiled mode always.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>sized</tt> and <tt>size</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>yes</td> |
|
|
<td>no</td> |
|
|
<td>sizing value</td> |
|
|
<td></td> |
|
|
<td>Cell variants are generated with anisotropic sizing.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>extents</tt></td> |
|
|
<td>polygon or edge</td> |
|
|
<td>yes</td> |
|
|
<td>no</td> |
|
|
<td>0</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>scaled</tt> and <tt>scale</tt></td> |
|
|
<td>any</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td>Reverts to flat mode.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>rotated</tt> and <tt>rotate</tt></td> |
|
|
<td>any</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td>Reverts to flat mode.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>transformed</tt> and <tt>transform</tt></td> |
|
|
<td>any</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td>Reverts to flat mode.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>moved</tt> and <tt>move</tt></td> |
|
|
<td>any</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td>Cell variants are generated.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>merged</tt> and <tt>merge</tt></td> |
|
|
<td>polygon or edge</td> |
|
|
<td>yes</td> |
|
|
<td>yes</td> |
|
|
<td>0</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>select_props</tt>, <tt>map_props</tt> and <tt>remove_props</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>nets</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>no</td> |
|
|
<td>no</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>fill</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>yes</td> |
|
|
<td>n/a</td> |
|
|
<td></td> |
|
|
<td></td> |
|
|
<td>Reverts to flat mode.</td> |
|
|
</tr> |
|
|
|
|
|
<tr> |
|
|
<td><tt>drc</tt></td> |
|
|
<td>polygon</td> |
|
|
<td>depending on operation</td> |
|
|
<td>depending on operation</td> |
|
|
<td>depending on operation</td> |
|
|
<td>A</td> |
|
|
<td></td> |
|
|
</tr> |
|
|
|
|
|
</table> |
|
|
|
|
|
<a name="edge_orientation"/> |
|
|
<h2>Edge Orientation and Edge-based Checks</h2> |
|
|
|
|
|
<p> |
|
|
By convention, edges are always oriented with "inside" being on the |
|
|
"right" side of the edge: |
|
|
</p> |
|
|
|
|
|
<img border="0" src="images/edge_orient.svg"/> |
|
|
|
|
|
<p> |
|
|
DRC checks ("width", "space" etc.) are available both for polygon and edge layers. |
|
|
Edges do not have a connection to a polygon and each edge is an individual objects, |
|
|
so the relation to other edges is purely defined by the orientation of the edge. |
|
|
The following pictures show these relations: |
|
|
</p> |
|
|
|
|
|
<img border="0" src="images/edge_relations.svg"/> |
|
|
|
|
|
|
|
|
|
|
|
</div> |
|
|
</body> |
|
|
</html> |
|
|
|
|
|
|
