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| author | scuri <scuri> | 2008-10-17 06:10:33 +0000 |
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| committer | scuri <scuri> | 2008-10-17 06:10:33 +0000 |
| commit | 7b52cc13af4e85f1ca2deb6b6c77de9c95ea0dcf (patch) | |
| tree | d0857278bde2eff784227c57dcaf930346ceb7ac /html/en/func/vectortext.html | |
First commit - moving from LuaForge to SourceForge
Diffstat (limited to 'html/en/func/vectortext.html')
| -rw-r--r-- | html/en/func/vectortext.html | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/html/en/func/vectortext.html b/html/en/func/vectortext.html new file mode 100644 index 0000000..e1b1d6e --- /dev/null +++ b/html/en/func/vectortext.html @@ -0,0 +1,133 @@ +<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN"> +<html> + <head> + <title>Vector Text</title> + <meta http-equiv="Content-Language" content="en-us"> + <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> + <link rel="stylesheet" type="text/css" href="../../style.css"> + </head> + <body> + <h2 align="center">Vector Text</h2> + <p>It is a text that uses a font created only with line segments. It is very + useful to be scaled and very fast. You must set the text size before drawing + any text. The functions ignore the new line character "\n"; only the <font>wdMultiLineVectorText</font> + function will consider this character. The default direction is horizontal from + left to right.</p> + <p align="center"><font size="4">Vector Text Parameters</font><br> + <img src="../../img/vector_text.gif" align="middle" border="2" width="101" height="91"></p> + <p>All vector text drawing in all drivers are simulated using other CD + primitives.</p> + <hr> + <pre class="function"><span class="mainFunction">void <a name="cdVectorText">cdCanvasVectorText</a>(cdCanvas* canvas, int x, int y, const char* text); [in C]</span> +void wdCanvasVectorText(cdCanvas* canvas, double x, double y, const char* text); (WC) [in C] + +canvas:VectorText(x, y: number, text: string) [in Lua] +canvas:wVectorText(x, y: number, text: string) (WC) [in Lua]</pre> + <p>Draws a vector text in position <tt><b>(x,y)</b></tt>, respecting the + alignment defined by <font><strong>cdTextAlignment</strong></font>. It ignores + the configuration <font><strong>cdBackOpacity</strong></font>, being always + transparent. It also ignores strings with multiple lines. It is ESSENTIAL to + call <font><strong>cdVectorTextSize</strong></font> or <font><strong>cdVectorCharSize</strong></font> + before using <font><strong>cdVectorText</strong></font> or <font><strong>cdMultiLineVetorText</strong></font>.</p> + <pre class="function"><span class="mainFunction">void <a name="cdMultiLineVectorText">cdCanvasMultiLineVectorText</a>(cdCanvas* canvas, int x, int y, const char* text); [in C]</span> +void wdCanvasMultiLineVectorText(cdCanvas* canvas, double x, double y, const char* text); (WC) [in C] + +canvas:MultiLineVectorText(x, y: number, text: string) [in Lua] +canvas:wMultiLineVectorText(x, y: number, text: string) (WC) [in Lua]</pre> + <p>Draws a vector text with several lines in position <b><tt>(x,y)</tt></b>, + respecting the alignment defined by <font><strong>cdTextAlignment</strong></font>. + It ignores the configuration <font><strong>cdBackOpacity</strong></font>, being + always transparent. Lines are broken by characters <font>"\n"</font>. Each line + respects the scale defined in <font><strong>cdVectorTextSize</strong></font> or <font> + <strong>cdVectorCharSize</strong></font>. This function's purpose is to make + function <strong><font>cdVectorText</font></strong> more efficient, not being + concerned with multiple lines.</p> + <h3>Attributes</h3> + <pre class="function"><span class="mainFunction">void <a name="cdVectorTextDirection">cdCanvasVectorTextDirection</a>(cdCanvas* canvas, int x1, int y1, int x2, int y2); [in C]</span> +void wdCanvasVectorTextDirection(cdCanvas* canvas, double x1, double y1, double x2, double y2); (WC) [in C] + +canvas:VectorTextDirection(x1, y1, x2, y2: number) [in Lua] +canvas:wVectorTextDirection(x1, y1, x2, y2: number) (WC) [in Lua]</pre> + <p>Defines the text direction by means of two points, <b><tt>(x1,y1)</tt></b> and <b> + <tt>(x2,y2)</tt></b>. The default direction is horizontal from left to right.</p> + <pre class="function"><span class="mainFunction">double* <a name="cdVectorTextTransform">cdCanvasVectorTextTransform</a>(cdCanvas* canvas, const double* matrix); [in C]</span> + +canvas:VectorTextTransform(matrix: table) -> (old_matrix: table) [in Lua] </pre> + <p>Defines a transformation matrix with 6 elements. If the matrix is NULL, no + transformation is set. The default direction is no transformation. The origin + is the left bottom corner of matrix. It returns the previous matrix, and the + returned vector is only valid until the following call to the function.</p> + <p>The matrix contains scale, rotation and translation elements. It is applied after + computing the position and orientation normal to the vector text. We can + describe the elements as follows:</p> + <pre>|x'| | scl_x*cos(ang) -sin(ang) trans_x | |x| | 3 4 5| +|y'| = | sin(ang) scl_y*cos(ang) trans_y | * |y| with indices | 0 1 2| + |1|</pre> + <pre class="function"><span class="mainFunction">void <a name="cdVectorTextSize">cdCanvasVectorTextSize</a>(cdCanvas* canvas, int w, int h, const char * text); [in C]</span> +void wdCanvasVectorTextSize(cdCanvas* canvas, double size_x, double size_y, const char* text); (WC) [in C] + +canvas:VectorTextSize(w, h: number, text: string) [in Lua] +canvas:wVectorTextSize(w, h: number, text: string) (WC) [in Lua]</pre> + <p>Modifies the scale of the vector text so that it corresponds to the string of + the bounding box defined by <b><tt>w</tt></b> and <b><tt>h</tt></b>. It ignores + strings with multiple lines.</p> + <pre class="function"><span class="mainFunction">double <a name="cdVectorCharSize">cdCanvasVectorCharSize</a>(cdCanvas* canvas, int size); [in C]</span> +double wdCanvasVectorCharSize(double size); (WC) [in C] + +canvas:VectorCharSize(size: number) -> (old_size: number) [in Lua] +canvas:wVectorCharSize(size: number) -> (old_size: number) (WC) [in Lua]</pre> + <p>Sets the height of the characters and adjusts the width according to it. + Returns the previous value. <strong><tt>CD_QUERY</tt></strong> returns the + current value.</p> + <pre class="function"><span class="mainFunction">char* <a name="cdVectorFont">cdCanvasVectorFont</a>(cdCanvas* canvas, const char *filename); [in C]</span> + +canvas:VectorFont(filename: string) -> (fontname: string) [in Lua]</pre> + <p>Replaces the current vector font with a font stored in a file with a given + name. Returns the name of the font loaded or NULL, if it fails. If <font>filename</font> + is NULL, it activates the default font "<b>Simplex II</b>" (There is no file + associated to this font, it is an embedded font). The library will attempt to + load a font from the current directory, if it fails then it will try the + directory defined by the environment variable "<strong><tt>CDDIR</tt></strong>", + if it fails, it will attempt to + load it using the <font>filename</font> as a string containing the font as + if the file was loaded into that string, if it fails again the font is reset + to the default font and returns NULL. The file format is + compatible with the GKS file format (text mode).</p> + <h3>Properties</h3> + <pre class="function"><span class="mainFunction">void <a name="cdGetVectorTextSize">cdCanvasGetVectorTextSize</a>(cdCanvas* canvas, const char* text, int *w, int *h); [in C]</span> +void wdCanvasGetVectorTextSize(cdCanvas* canvas, const char* text, double *x, double *y); (WC) [in C] + +canvas:GetVectorTextSize(text: string) -> (w, h: number) [in Lua] +canvas:wGetVectorTextSize(text: string) -> (w, h: number) (WC) [in Lua]</pre> + <p>Queries the string's bounding box. Ignores strings with multiple lines. It is + not necessary to provide all return pointers, you can provide only the desired + values and <font>NULL</font> for the others.</p> + <pre class="function"><span class="mainFunction">void <a name="cdGetVectorTextBounds">cdCanvasGetVectorTextBounds</a>(cdCanvas* canvas, char* text, int px, int py, int *rect); [in C]</span> +void wdCanvasGetVectorTextBounds(cdCanvas* canvas, char* text, double x, double y, double *rect); (WC) [in C] + +canvas:GetVectorTextBounds(text: string, px,py: number) -> (rect: table) [in Lua] +canvas:wGetVectorTextBounds(text: string, px,py: number) -> (rect: table) (WC) [in Lua] </pre> + <p>Returns the bounding rectangle of the text specified in the current vector + font, alignment and direction. Eight values are returned, corresponding to + pairs (x,y) of the rectangle's vertices ordered conter-clockwise, starting by + the bottom left corner.</p> + <h3>Character Codes</h3> + <p>The old GKS format contains ASCII codes so a convertion from ANSI to ASCII is + done when possible, unmapped characters are left unchanged, but some rearrage + was necessary to acomodate the convertion. + </p> + <p>The default vector font was changed from the original Simplex II to contain + all ANSI accented characters. So some ASCII characters were replaced.</p> + <p>Bellow is the character code table of the default font.</p> + <p style="TEXT-ALIGN: center"> + <img src="../../img/vectorfont_default.png" width="717" height="977"><br> + <strong>Default Font</strong></p> + <p>The original Simplex II font is available in the file + "cd/etc/vectorfont00.txt". Bellow is the character code table of the original + font (the table displays the characters after the convertion from ANSI to + ASCII):</p> + <p style="TEXT-ALIGN: center"> + <img src="../../img/vectorfont_simplex2.png" width="723" height="978"><br> + <strong>Original Simplex II</strong></p> + </body> +</html>
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