LiteCAD API reference

一、Text (single-line)

Text conveys important information in your drawing. You use text for title blocks, to label parts of the drawing, to give specifications, or to make annotations.New text entities are created with the current Text style.

1.Formatting codes for single text

The following control codes are used to add special characters in Text entity:

You can enter any character by its Unicode value, with the control code\U+xxxx, where xxxx is the hexadecimal value of the Unicode character.For example:

2.Text Alignment

Create texts with various alignment

void DemoTextAlign (HANDLE hLcWnd)
{HANDLE hDrw, hBlock, hEnt;int    EntType;COLORREF Color;double RectW = 500.0;double RectH = 50.0;double StepY = 60.0;double Htxt = 15.0;     // text heightdouble WScale = 1.0;    // text width scaledouble X, Y, dx, dy;// get drawing and block, linked with CAD windowhDrw = lcPropGetHandle( hLcWnd, LC_PROP_WND_DRW );hBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// Create rectangles and insert text at center point, changing alignmentX = 0;Y = 0;lcBlockAddText2( hBlock, L"LC_TA_LEFBOT", X, Y, LC_TA_LEFBOT , Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_CENBOT", X, Y, LC_TA_CENBOT, Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_RIGBOT", X, Y, LC_TA_RIGBOT, Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_LEFCEN", X, Y, LC_TA_LEFCEN, Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_CENTER", X, Y, LC_TA_CENTER , Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_RIGCEN", X, Y, LC_TA_RIGCEN, Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_LEFTOP", X, Y, LC_TA_LEFTOP, Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_CENTOP", X, Y, LC_TA_CENTOP, Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );Y += StepY;lcBlockAddText2( hBlock, L"LC_TA_RIGTOP", X, Y, LC_TA_RIGTOP, Htxt, WScale, 0, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X, Y );dx = RectW * 0.35;dy = RectH * 0.3;Y = -StepY;lcBlockAddText3( hBlock, L"LC_TA_FIT", X-dx, Y-dy, X+dx, Y-dy, LC_TA_FIT, Htxt, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X-dx, Y-dy );lcBlockAddPoint( hBlock, X+dx, Y-dy );Y -= StepY;lcBlockAddText3( hBlock, L"LC_TA_ALIGNED", X-dx, Y-dy, X+dx, Y-dy, LC_TA_ALIGNED, WScale, 0 );lcBlockAddRect( hBlock, X, Y, RectW, RectH, 0, 0);lcBlockAddPoint( hBlock, X-dx, Y-dy );lcBlockAddPoint( hBlock, X+dx, Y-dy );// set red color for all text entitiesColor = RGB(255,0,0);hEnt = lcBlockGetFirstEnt( hBlock );while( hEnt ){EntType = lcPropGetInt( hEnt, LC_PROP_ENT_TYPE );if (EntType == LC_ENT_TEXT){lcPropPutInt( hEnt, LC_PROP_ENT_COLOR, Color );}hEnt = lcBlockGetNextEnt( hBlock, hEnt );}lcBlockUpdate( hBlock, false, 0 );// zoom extentslcWndZoomRect( hLcWnd, 0,0,0,0 );// and slightly reduce the viewlcWndZoomScale( hLcWnd, 0.8 );
}

3.Text Style

A Text Style is a named, saved collection of settings that determine the appearance of text characters, for example, the settings include things like font, stretched, compressed, oblique, mirrored etc… The primary marker of any text style is LiteCAD font (LCF) or Windows TTF font that is assigned to that text style.
The LiteCAD package contains LCFont.exe program which can create LCF font file from AutoCAD SHX/SHP or Windows TTF font.New Text entities are added to a drawing using the current text style.When you create a new drawing, it already has one text style, by default, named “Standard”.

二、Multiline Text

Adds a new Multiline Text object into a block: HANDLE lcBlockAddMText (HANDLE hBlock,LPCWSTR szText,double X,double Y,double WrapWidth,int Align,double RotAngle,double Height,double WScale);
Create multiline text with stacked characters

void DemoMText (HANDLE hLcWnd)
{double x0, y0, W, H, Ht;HANDLE hDrw, hBlock, hTStyle, hText;WCHAR* szText = L"\\A1;H\\H0.5x;\\S^2;\\H2x;O 1\\H0.6x;\\S2/3;\\H1.6667x;+4\\H0.6x;\\S0.5^;\\H1.6667x;=3.66666...";// get drawing and block, linked with CAD windowhDrw = lcPropGetHandle( hLcWnd, LC_PROP_WND_DRW );hBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// set font "Arial" for the text style "Standard"hTStyle = lcPropGetHandle( hDrw, LC_PROP_DRW_TEXTSTYLE_STD );lcPropPutBool( hTStyle, LC_PROP_TSTYLE_WINFONT, true );lcPropPutStr( hTStyle, LC_PROP_TSTYLE_FONT, L"Arial" );lcPropPutBool( hTStyle, LC_PROP_TSTYLE_SOLID, true );// set active text stylelcPropPutHandle( hDrw, LC_PROP_DRW_TEXTSTYLE, hTStyle );// add multiline textx0 = 0.0;y0 = 0.0;W = 130.0;  // wrap widthHt = 10.0;  // text heighthText = lcBlockAddMText( hBlock, szText, x0, y0, W, LC_TA_CENTER, 0.0, Ht, 1.0 );// add bounding rectangleW = lcPropGetFloat( hText, LC_PROP_MTEXT_WRECT ) * 1.1;H = lcPropGetFloat( hText, LC_PROP_MTEXT_HRECT ) * 1.2;lcBlockAddRect( hBlock, x0, y0, W, H, 0.0, false );// update viewlcBlockUpdate( hBlock, true, 0 );lcWndExeCommand( hLcWnd, LC_CMD_ZOOM_EXT, 0 );
}

三、Arc Text

HANDLE lcBlockAddArcText (HANDLE hBlock,LPCWSTR szText,double X,double Y,double Radius,double StartAngle,BOOL bClockwise,double Height,double WScale,int Align);
Create arc texts

void DemoArcText (HANDLE hLcWnd)
{WCHAR* szStyleName = L"New Style";WCHAR* szText = L"THIS IS THE ARC TEXT";double X[3], Y, R, H, Gap, Angle;int    i, k, Align[3];HANDLE hDrw, hBlock, hTStyle;bool   bClockwise = true;// get drawing and block, linked with CAD windowhDrw = lcPropGetHandle( hLcWnd, LC_PROP_WND_DRW );hBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// get text style with specified namehTStyle = lcDrwGetObjectByName( hDrw, LC_OBJ_TEXTSTYLE, szStyleName );if (hTStyle == NULL){// the style don't exist, create new text stylehTStyle = lcDrwAddTextStyle( hDrw, szStyleName, L"Times New Roman", true );}// set current text stylelcPropPutHandle( hDrw, LC_PROP_DRW_TEXTSTYLE, hTStyle );// add graphicsR = 10.0;X[0] = 0;X[1] = R * 3.0;X[2] = R * 6.0;Y = 0.0;H = R / 5.0;Gap = H / 4.0;Angle = 90.0 * LC_DEG_TO_RAD;Align[0] = LC_ATA_LEFT;Align[1] = LC_ATA_CENTER;Align[2] = LC_ATA_RIGHT;for (k=0; k<2; ++k){for (i=0; i<3; ++i){lcBlockAddCircle( hBlock, X[i], Y, R, false );lcBlockAddLine( hBlock, X[i], Y, X[i], Y+R );lcBlockAddArcText( hBlock, szText, X[i], Y, R+Gap, Angle, bClockwise, H, 1.0, Align[i] );}bClockwise = !bClockwise;Y -= R * 3.0;}// update viewlcBlockUpdate( hBlock, true, 0 );lcWndExeCommand( hLcWnd, LC_CMD_ZOOM_EXT, 0 );
}

四、Raster Image

Raster images consist of a rectangular grid (or raster) of small squares or dots known as pixels. LiteCAD does not keep raster images stored inside of its file format. It only keeps a reference to the name of the image file which is inserted into the drawing.Litecad.dll internally supports only Windows BMP format, but if the Litecad.dll directory contains the FreeImage.dll file (http://freeimage.sourceforge.net), it will be used to load many various raster formats (jpeg, tiff, gif, png, etc…). Note that the FreeImage.dll file works as a plugin, and LiteCAD can work without it, therefore redistribute this file only if your LiteCAD-based application requires support for various raster image formats.

Create raster image (set pixels)

void DemoImage2 (HANDLE hLcWnd)
{int    ImgW, ImgH, PixX, PixY, R, G, B;double x0, y0, x1, y1, W, H, Htxt, Gap;HANDLE hDrw, hBlock, hImage, hImgRef;WCHAR* szImageName = L"Sample image";// get drawing and block, linked with CAD windowhDrw = lcPropGetHandle( hLcWnd, LC_PROP_WND_DRW );hBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// get image by name hImage = lcDrwGetObjectByName( hDrw, LC_OBJ_IMAGE, szImageName );if (hImage == NULL){// image size, pixelsImgW = 500;ImgH = 500;// create imagehImage = lcDrwAddImage2( hDrw, szImageName, ImgW, ImgH, 24 );// set color of the image pixelsfor (PixX=0; PixX<ImgW; ++PixX){R = (255 * PixX) / ImgW;for (PixY=0; PixY<ImgH; ++PixY){G = (255 * PixY) / ImgH;B = 255 - abs(R-G);lcImageSetPixelRGB( hImage, PixX, PixY, R, G, B );}}}// add image referencex0 = 10.0;y0 = 20.0;W = 50.0;H = 50.0;Htxt = 5.0;Gap = Htxt * 0.3;lcBlockAddImageRef( hBlock, hImage, x0, y0, W, H, false );// add more graphic objectsx0 = x0 - Gap;y0 = y0 - Gap;W = W + Gap + Gap;H = H + Gap + Gap;lcBlockAddRect2( hBlock, x0, y0, W, H, 0, false );x1 = x0 + W + Gap;y1 = y0 + H + Gap;x0 = x0 - Gap;y0 = y0 - Gap;lcBlockAddText2( hBlock, L"RED", x1, y0, LC_TA_LEFTOP, Htxt, 1, 0, false );lcBlockAddText2( hBlock, L"GREEN", x0, y1, LC_TA_RIGBOT, Htxt, 1, 0, false );lcBlockAddText2( hBlock, L"BLUE", x0, y0, LC_TA_RIGTOP, Htxt, 1, 0, false );lcBlockAddText2( hBlock, L"WHITE", x1, y1, LC_TA_LEFBOT, Htxt, 1, 0, false );// displaylcBlockUpdate( hBlock, true, 0 );lcWndExeCommand( hLcWnd, LC_CMD_ZOOM_EXT, 0 );
}

五、Image reference

Adds a new image reference object into a block:HANDLE lcBlockAddImageRef (HANDLE hBlock,HANDLE hImage,double X,double Y,double Width,double Height,BOOL bBorder);
Parameters：
hBlock（Handle to a block.）；hImage（Handle to the image definition.）；X Y（Coordinates of image insertion. Left bottom corner of the image will be placed at this coordinate. ）；Width Height（Image size. In order to keep original proportions, specify only one dimension, setting zero for other.）；bBorder（If TRUE, then the image will have a border lines.）.

Create raster image (from a file)

void DemoImage (HANDLE hLcWnd)
{HANDLE hDrw, hBlock, hImage, hImage2, hImageRef;WCHAR* szImageFile1 = L"d:/___TMP/Image01.jpg";WCHAR* szImageFile2 = L"d:/___TMP/Image03.png";double X, Y, W, H, W2, Xc, Yc;int    Wpix, Hpix;// get drawing and block, linked with CAD windowhDrw = lcPropGetHandle( hLcWnd, LC_PROP_WND_DRW );hBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// add raster image from a filehImage = lcDrwAddImage( hDrw, L"", szImageFile1 );// get image dimensions (pixels)Wpix = lcPropGetInt( hImage, LC_PROP_IMAGE_WPIX );Hpix = lcPropGetInt( hImage, LC_PROP_IMAGE_HPIX );// add one more raster imagehImage2 = lcDrwAddImage( hDrw, L"", szImageFile2 );// insert the image into a drawingX = 0.0;Y = 0.0;W = 100.0;  // width of image ref. (height will be set according the ratio of image dimensions)hImageRef = lcBlockAddImageRef( hBlock, hImage, X,Y, W,0, true );// get height of the image referenceH = lcPropGetFloat( hImageRef, LC_PROP_IMGREF_H );// add 2nd image reference above the 1stY+=H;hImageRef = lcBlockAddImageRef( hBlock, hImage, X,Y, W,0, false );// flip verticallylcPropPutBool( hImageRef, LC_PROP_IMGREF_FLIPVER, true );// and make it greyscalelcPropPutBool( hImageRef, LC_PROP_IMGREF_GREY, true );// add 3rd image reference at right of the 2ndX+=W;hImageRef = lcBlockAddImageRef( hBlock, hImage, X,Y, W,0, true );// reduce resolution 8 timeslcImgRefResize( hImageRef, Wpix/8, Hpix/8, LC_IMGRES_BICUBIC );// add 4rd image referenceY-=H;hImageRef = lcBlockAddImageRef( hBlock, hImage, X,Y, W,0, false );// get center pointXc = lcPropGetFloat( hImageRef, LC_PROP_IMGREF_XC );Yc = lcPropGetFloat( hImageRef, LC_PROP_IMGREF_YC );// scale and rotate the image ref.lcEntScale( hImageRef, Xc, Yc, 0.8 );lcEntRotate( hImageRef, Xc, Yc, 30.0 * LC_DEG_TO_RAD );// add image ref. of hImage2Y += H;W2 = W / 4.0;hImageRef = lcBlockAddImageRef( hBlock, hImage2, X-W2/2, Y-W2/2, W2,0, false );// set transparent colorlcPropPutInt( hImageRef, LC_PROP_IMGREF_TRANSP, 1 );lcPropPutInt( hImageRef, LC_PROP_IMGREF_TRCOLOR, RGB(255,255,255) );// displaylcBlockUpdate( hBlock, true, 0 );lcWndExeCommand( hLcWnd, LC_CMD_ZOOM_EXT, 0 );
}

HANDLE lcBlockAddImagePlace (HANDLE hBlock,int Id,double X, double Y,double Width, double Height,BOOL bBorder);
Parameters:
hBlock(Handle to a block.);Id(Identifier of an image. Use this number in a DrawImage event to identify what image must be drawn.);X Y(Coordinates of image insertion. Left bottom corner of the image will be placed at this coordinate. );Width Height(Image size, in drawing’s units.);bBorder(If TRUE, then the image will have a border lines.).

Draw custom raster image (rendered by application)

...// register event procedurelcEventSetProc( LC_EVENT_DRAWIMAGE, DrawImageProc, 0, 0 );
...// create image object in a drawingHANDLE hImgRef;hImgRef = lcBlockAddImagePlace( hBlock, 105, 10,20,100,50, true );lcBlockUpdate( hBlock, false, hImgRef );lcWndRedraw( m_hLcWnd );
...// This function is called on LC_EVENT_DRAWIMAGE event
//-----------------------------------------------
void CALLBACK DrawImageProc (HANDLE hEvent)
{COkDib Dib;OK_DIBDRAWPRM Prm;double W, H, PixelSize;int    idImage;HANDLE hLcWnd;if (Dib.Load( L"d:/Pictures/SomeImage.bmp" ) == false){return;}hLcWnd = lcPropGetHandle( hEvent, LC_PROP_EVENT_WND );idImage = lcPropGetInt( hEvent, LC_PROP_EVENT_INT6 );  // ID passed by lcBlockAddImagePlace()W = lcPropGetFloat( hEvent, LC_PROP_EVENT_FLOAT1 );    // image width (drawing's units)H = lcPropGetFloat( hEvent, LC_PROP_EVENT_FLOAT2 );    // image height (drawing's units)memset( &Prm, 0, sizeof(Prm) );Prm.hDC = (HDC)lcPropGetHandle( hEvent, LC_PROP_EVENT_HDC );Prm.ImgLeft   = lcPropGetInt( hEvent, LC_PROP_EVENT_INT1 );Prm.ImgBottom = lcPropGetInt( hEvent, LC_PROP_EVENT_INT2 );PixelSize = lcPropGetFloat( hLcWnd, LC_PROP_WND_PIXELSIZE );Prm.ImgWidth  = (UINT)(W/PixelSize + 0.5);  // 0 for non-scalable imagePrm.ImgHeight = (UINT)(H/PixelSize + 0.5);  // 0 for non-scalable image
//  Prm.Align = 1;          // alignment for non-scalable image, 0: center, 1: left-bottomPrm.bDevRectValid = true;   // if TRUE then a device rectangle (below parameters) are validPrm.DevLeft   = 0;Prm.DevTop    = 0;Prm.DevRight  = lcPropGetInt( hEvent, LC_PROP_EVENT_INT3 );Prm.DevBottom = lcPropGetInt( hEvent, LC_PROP_EVENT_INT4 );// the next function draws the image using WinAPI function StretchDIBitsDib.Draw( Prm );
}

六、ECW / Jpeg2000 Image

ECW (Enhanced Compression Wavelet) is a proprietary wavelet compression image format optimized for aerial and satellite imagery.The lossy compression format efficiently compresses very large images with fine alternating contrast. Map projection information can be embedded into the ECW file format to support geospatial applications.
LiteCAD uses the ERDAS ECW JP2 SDK to support this image format.There is NCSEcw.dll file from Hexagon Geospatial that come with LiteCAD package.LiteCAD can work without this file, therefore you must redistribute this file only if your LiteCAD-based application requires support for ECW or Jpeg2000 formats.

七、Hatch

Hatch is a boundary filled with a pattern of lines or with a solid color. The boundary can have inner “islands”. LiteCAD uses hatch patterns in the same format as AutoCAD. The hatches.pat file included with the LiteCAD package contains many predefined hatch patterns. You can also create your own hatch patterns.
HANDLE lcBlockAddHatch (HANDLE hBlock,LPCWSTR szFileName,LPCWSTR szPattern,double Scale,double RotAngle);
Parameters:
hBlock(Handle to a block.);szFileName(Name of the file which contains hatch patterns definitions.For example, LiteCAD package has the “hatches.pat” file.);szPattern(The meaning depends on the szFileName parameter. If the filename is specified,then szPattern is a name of hatch pattern, as written in the file.If the filename is an empty string, then szPattern is a hatch pattern definition.See the code sample below.)；Scale（Scale of the pattern.）；RotAngle（Rotation angle of the pattern.）.

Create hatch

void DemoHatch (HANDLE hLcWnd)
{HANDLE hBlock, hEnt;bool   bSolid = false;  // if TRUE then solid fillint    Method = 0;      // method of creating a hatch entitydouble Scale = 8.0;     // scale of hatch patterndouble Angle = 45 * LC_DEG_TO_RAD;  // rotation of hatch pattern// get a block, linked with CAD windowhBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// clear selection setlcBlockUnselect( hBlock );// create entities and add them into selectionhEnt = lcBlockAddCircle( hBlock, 10, 10, 5, false );lcBlockSelectEnt( hBlock, hEnt, true );hEnt = lcBlockAddCircle( hBlock, 30, 10, 5, false );lcBlockSelectEnt( hBlock, hEnt, true );hEnt = lcBlockAddRect2( hBlock, 0, 0, 40, 20, 5, false );lcBlockSelectEnt( hBlock, hEnt, true );// create Hatch entity using selected entities as an outlineif (bSolid){hEnt = lcBlockAddHatch( hBlock, L"", L"", 0.0, 0.0 );// set filling colorlcPropPutStr( hEnt, LC_PROP_ENT_FCOLOR, L"0,255,255" );}else{if (Method == 0){// hatch pattern is defined in *.pat filelcBlockAddHatch( hBlock, L"hatches.pat", L"ANGLE", Scale, Angle );}else{// hatch pattern is defined by text stringlcBlockAddHatch( hBlock, L"", L"0, 0,0, 0,.275, .2,-.075\n90, 0,0, 0,.275, .2,-.075", Scale, Angle );}}   // clear selection set and update block extentslcBlockUnselect( hBlock );lcBlockUpdate( hBlock, false, 0 );// zoom viewlcWndZoomRect( hLcWnd, -10, -10, 50, 30 );
}

Create hatch:lcHatchBoundStart;lcHatchBoundEntity; lcHatchBoundEndLoop;lcHatchBoundEnd.

void DemoHatch2 (HANDLE hLcWnd)
{HANDLE hBlock, hHatch, hEnt;bool   bSolid = false;  // if TRUE then solid fillint    Method = 1;      // method of creating a hatch entitydouble Scale = 5.0;     // scale of hatch patterndouble Angle = 30.0 * LC_DEG_TO_RAD;  // rotation of hatch patternWCHAR* szPattern;// get a block, linked with CAD windowhBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// create Hatch entity using selected entities as an outlineif (bSolid){hHatch = lcBlockAddHatch( hBlock, L"", L"", 0.0, 0.0 );// set filling colorlcPropPutStr( hHatch, LC_PROP_ENT_FCOLOR, L"0,255,255" );}else{Scale = 5.0;Angle = 30.0 * LC_DEG_TO_RAD;if (Method == 0){// hatch pattern is defined in *.pat fileszPattern = L"ANGLE";hHatch = lcBlockAddHatch( hBlock, L"hatches.pat", szPattern, Scale, Angle );}else{// hatch pattern is defined by text stringszPattern = L"0, 0,0, 0,.275, .2,-.075\n90, 0,0, 0,.275, .2,-.075";hHatch = lcBlockAddHatch( hBlock, L"", szPattern, Scale, Angle );}}// the hatch entity has not boundaries, so we have to add itlcHatchBoundStart( hHatch );// create outer boundary from lines and arcshEnt = lcBlockAddLine( hBlock, 0, 0, 15, 0 );lcHatchBoundEntity( hHatch, hEnt );hEnt = lcBlockAddArc( hBlock, 15, 5, 5, 270*LC_DEG_TO_RAD, 180*LC_DEG_TO_RAD );lcHatchBoundEntity( hHatch, hEnt );hEnt = lcBlockAddLine( hBlock, 15, 10, 0, 10 );lcHatchBoundEntity( hHatch, hEnt );hEnt = lcBlockAddArc( hBlock, 0, 5, 5, 90*LC_DEG_TO_RAD, 180*LC_DEG_TO_RAD );lcHatchBoundEntity( hHatch, hEnt );lcHatchBoundEndLoop( hHatch ); // add inner boundarieshEnt = lcBlockAddCircle( hBlock, 0, 5, 2.0, false );lcHatchBoundEntity( hHatch, hEnt );hEnt = lcBlockAddRect( hBlock, 12,5, 6, 3, 0, false );lcHatchBoundEntity( hHatch, hEnt );// finish boundaries definitionlcHatchBoundEnd( hHatch );lcBlockUpdate( hBlock, true, 0 );// zoom viewlcWndZoomRect( hLcWnd, -15, -10, 30, 20 );
}

Retrieve outlines of hatch entity
A sample drawing (“exp_hatch_2.lcd”) has a hatch entity,marked with key value 123. We have to retrieve outlines of this hatch and create polylines which are copies of that outlines, with some offset.

void DemoGetHatchOutlines (HANDLE hLcWnd)
{int    Key = 123;   // required hatch entity is marked with this key valueHANDLE hBlock, hEntHatch, hPline;int    i, j, k, n, nPaths;double x, y, dx, dy;// get a block, linked with CAD windowhBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_VIEWBLOCK );// get required hatch entityhEntHatch = lcBlockGetEntByKey( hBlock, Key );dx = 30.0;dy = 15.0;// get hatch outlinesnPaths = lcPropGetInt( hEntHatch, LC_PROP_HATCH_NLOOP );k = 0;for (i=0; i<nPaths; ++i){// create a polyline which will be a copy of the hatch outlinehPline = lcBlockAddPolyline( hBlock, 0, true, false );// get outline verticesn = lcHatchGetLoopSize( hEntHatch, i );for (j=0; j<n; ++j) {lcHatchGetPoint( hEntHatch, k, &x, &y );++k;// add vertex to the polylinelcPlineAddVer( hPline, 0, x+dx, y+dy );}lcPlineEnd( hPline );// set red color for the polylinelcPropPutInt( hPline, LC_PROP_ENT_COLOR, RGB(255,0,0) );}lcBlockUpdate( hBlock, true, 0 );// view drawing's extentslcWndZoomRect( hLcWnd, 0, 0, 0, 0 );
}

lcHatchGetEnt:Retrieves boundary entities of associative hatch.
HANDLE lcHatchGetEnt (HANDLE hEntHatch,int Mode);
Parameters:
hEntHatch(Handle to a hatch object.);Mode(0 - first entity,1 - next entity).

void DemoGetHatchEnts (HANDLE hLcWnd)
{int    Key = 123;   // required hatch entity is marked with this key valueint    NumEnts;HANDLE hBlock, hEnt, hEntHatch;BOOL   bAssoc;// get a block, linked with CAD windowhBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_VIEWBLOCK );// find required hatch by user-defined keyhEntHatch = lcBlockGetEntByKey( hBlock, Key );if (hEntHatch){// check if the hatch is associativebAssoc = lcPropGetBool( hEntHatch, LC_PROP_HATCH_ASSOC );if (bAssoc){// get number of boundary entitiesNumEnts = lcPropGetInt( hEntHatch, LC_PROP_HATCH_NENTS );// get first entity of hatch boundaryhEnt = lcHatchGetEnt( hEntHatch, 0 );  while( hEnt ){// set red color for the entitylcPropPutInt( hEnt, LC_PROP_ENT_COLOR, RGB(255,0,0) );// get next entity of hatch boundaryhEnt = lcHatchGetEnt( hEntHatch, 1 );  }lcWndRedraw( hLcWnd );}}
}

八、Dimension

void DemoDims (HANDLE hLcWnd)
{HANDLE hBlock, hEnt;WCHAR* szColor = L"200,150,50";// get a block linked to graphics windowhBlock = lcPropGetHandle( hLcWnd, LC_PROP_WND_BLOCK );// linear dimensionslcBlockAddDimLin( hBlock, 0,0, 30,20, 15,40, 10*LC_DEG_TO_RAD, L"L=<>" );lcBlockAddDimLin( hBlock, 0,0, 30,20, 40,10, 95*LC_DEG_TO_RAD, L"" );lcBlockAddDimHor( hBlock, 100,0, 130,20, 40, L"L=<>" );lcBlockAddDimVer( hBlock, 100,0, 130,20, 140, L"" );// aligned dimensionslcBlockAddDimAli( hBlock, 0,0, 30,20, 0,50, L"" );lcBlockAddDimAli2( hBlock, 100,0, 130,20, 20, L"" );// ordinate dimensionslcBlockAddDimOrd( hBlock, 40,30, 35,50, true, L"X=<>" );lcBlockAddDimOrd( hBlock, 40,30, 60,35, false, L"Y=<>" );// additional entitieshEnt = lcBlockAddArc( hBlock, 70,50, 20, -30*LC_DEG_TO_RAD, 90*LC_DEG_TO_RAD );lcPropPutStr( hEnt, LC_PROP_ENT_COLOR, szColor );lcPropPutBool( hEnt, LC_PROP_ARC_SECTOR, true );hEnt = lcBlockAddArc( hBlock, 70,50, 28.284, -110*LC_DEG_TO_RAD, 200*LC_DEG_TO_RAD );lcPropPutStr( hEnt, LC_PROP_ENT_COLOR, szColor );hEnt = lcBlockAddCircle( hBlock, 170,50, 20, false );lcPropPutStr( hEnt, LC_PROP_ENT_COLOR, szColor );// radius  dimensionslcBlockAddDimRad( hBlock, 70,50, 90,50, 100,50, L"" );lcBlockAddDimRad2( hBlock, 170,50, 20,-30*LC_DEG_TO_RAD, 10, L"" );// diameter dimensionslcBlockAddDimDia( hBlock, 70,50, 90,70, 80,100, L"" );lcBlockAddDimDia2( hBlock, 170,50, 20,30*LC_DEG_TO_RAD, 30, L"" );// angular dimensionslcBlockAddDimAng( hBlock, 0,100, 10,100, 0,110, 20,101, 0.5, L"" );lcBlockAddDimAng( hBlock, 0,100, 10,98, 10,100, 23,99.9, -2, L"" );lcBlockAddDimAng2( hBlock, 50,100, 60,100, 50,110, 60,111, 70,100, 0.5, L"" );// update viewlcBlockUpdate( hBlock, false, 0 );lcWndExeCommand( hLcWnd, LC_CMD_ZOOM_EXT, 0 );
}

Dimension Style
A Dimension Style defines the appearance of a dimension entities. When you create a new drawing it already has the “Standard” dimension style by default. New dimension entities are added to a drawing using the current dimension style.
Type of arrows:This are types of arrowheads used in dimension style.

九、Leader

A leader object is a line with an arrowhead at one end and a multiline text object at the other.
In some cases, a short horizontal line, called a landing, connects text and feature control frames to the leader line. The landing and leader line are associated with the multiline text object, so when the landing is relocated, the content
and leader line move along with it.

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LiteCAD API reference

一、Text (single-line)

1.Formatting codes for single text

2.Text Alignment

3.Text Style

二、Multiline Text

三、Arc Text

四、Raster Image

五、Image reference

六、ECW / Jpeg2000 Image

七、Hatch

八、Dimension

1.Dimension Linear (rotated)

2.Dimension Aligned

3.Dimension Angular

4.Dimension Radial

5.Dimension Diametric

6.Dimension Ordinate

九、Leader

LiteCAD参考文档的学习四(单文本、多文本、弧形文本、光栅图像、图像引用、ECW/Jpeg2000 Image图像、填充图案、尺寸、引线)相关推荐

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