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The ESnap box size is a system controlled value (DYNASNAPSIZE) and can be changed or read via C++ as follow:

GetFxSystemServices()->GetHostAppServices()->setDYNASNAPSIZE( YOUR_DYNASNAPSIZE );
GetFxSystemServices()->GetHostAppServices()->getDYNASNAPSIZE();

Note: The ESnap box size varies with the display resolution to the Android device. We recommend to update the value YOUR_DYNASNAPSIZE with the Android display metrics and apply the correct device dependent multiplier. This ensure the ESnap box will have the same size on all devices.

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The kernel SDK also expects to read a special XML file (fontConfig.xml) from this location. This file is treated as some sort of index and specifies what fonts are loaded and which fonts are supposed to substitute missing fonts. So make sure both the fontConfig.xml and all referenced fonts exist inside the device location.

Hint: The sample application DWG Editor uses this concept.

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How to select entities by type and layer name?

Status
colour Yellow title C++

The class CFxUserIO offers a method DoSSGet(...) that allows to pass the selection set to be processed and additionally conditions about what entities are qualified to be selected. The main selection set can be accessed via GetFxMainSelectionSet() from class CFxDocument. The filter is a fdt_resbufW that can be constructed from a builder GetFxAPI()->fdt_buildlistW(). GetFxAPI() can be accessed from CFxDocument. The builder fdt_buildlistW supports to specify a list of parameter. The list of parameter is terminated by a 0.

To specify a filter based on entity type and layer name, the builder should be constructed as follow:

fdt_buildlistW(
RTDXF0, "DXFNAME", // Set DXF-name
8, "LAYERNAME",    // Set layer name
0 );              // Termination 0

The command context CFxCommandContext is accessible inside the method Execute() from class CFxCommand. We recommend to always use commands but in rare cases the CFxDocument can be also accessed via ACTIVE_DOCUMENT().

// Get main selection
CFxSelectionSet* pFxSelSet = pCmdCtx->GetFxDocument()->GetFxMainSelectionSet();

// Construct resbuf with (dxf code - value) pairs to filter object for selection. Filter works as white-list.
fdt_resbufW *pFilter = pCmdCtx->GetFxDocument()->GetFxAPI()->fdt_buildlistW(
            RTDXF0, "CIRCLE", // Set DXF-name
            8, "MYLAYER",    // Set layer name
            0 );                         // Termination 0

// Do select with filter.
pCmdCtx->GetFxDocument()->GetFxUserIO()->DoSSGet( CFxUserIO::eFilter, // Set filter mode
                                                  pFxSelSet, CFxUserIO::eKwSSGet, L"", L"",
                                                  pFilter, // Set filter
                                                  0 );

// Release filter
pCmdCtx->GetFxDocument()->GetFxAPI()->fdt_relrbW( pFilter );

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How to change entity snap settings?

Status
colour Yellow title C++

The entity snap settings are a system controlled value (OSMODE) and can be changed or read via C++ as follow:

GetFxSystemServices()->GetHostAppServices()->setOSMODE( YOUR_OSMODE );
GetFxSystemServices()->GetHostAppServices()->getOSMODE();

The value is a bit combination that can be constructed by the values in the table down below:

Hint: To get the correct value for combined bits, OSMODE system variable can be also checked with ARES Commander. Type OSMODE in the command line to read the current entity snap settings value.

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How to log debug information and read from logcat?

Status
colour Yellow title C++

Android NDK offers a simple way to log information. These logging information will be written to the console of Android Studio. For further details please check Android official website https://developer.android.com/ndk/reference/group/logging . Note: Do not miss to link against Android library log.

#include <android/log.h>

int main()
{
    __android_log_print( ANDROID_LOG_INFO , "MY_TAG" , "MY_INFO %d" , 1 );
}