ChartDirector Ver 3.1 (PHP Edition Edition)

Incorporating Charts in Web Pages

In many real application, the charts created by ChartDirector are to be displayed inside HTML based web pages.

To include any image in a HTML web page, one needs to insert an <IMG> tag in the HTML web page. When the browser sees the <IMG> tag, it will load the image using the URL in the <IMG> tag with another HTTP connection.

The same method applies when including a ChartDirector chart in a HTML web page. An <IMG> tag should be inserted in the web page, with its URL pointing to a charting script (a script that uses ChartDirector to create and deliver chart images).

For example:

<HTML> <BODY> <h1>Hello World!</h1> <p>Hi, this is my first web page with ChartDirector charts.</p> <IMG SRC="http://aaa.bbb.ccc.ddd/ChartDirector/phpdemo/simplebar.php"> More HTML elements ...... </BODY> </HTML>

In the above code, the "http://aaa.bbb.ccc.ddd/ChartDirector/phpdemo/simplebar.php" is a charting script that uses ChartDirector to create and deliver chart images.

You can include multiple charts in the same web page by using multiple <IMG> tags pointing to multiple charting scripts.

© 2004 Advanced Software Engineering Limited. All rights reserved.
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© 2004 Advanced Software Engineering Limited. All rights reserved.
width and height are the same, use the size attribute. height The font height. This attribute is used to set the font width and height to different values. If the width and height are the same, use the size attribute. color The text color in hex format. underline The line width of the line used to underline the following characters. Set to 0 to disable underline. advance Move the cursor forward (to the right) by the number of pixels as specified by the value this attribute. advanceTo Move the cursor forward (to the right) to the position as specified by the value this attribute. The position is specified as the number of pixels to the right of the left border of the block. If the cursor has already passed through the specified position, the cursor is not moved.
Note that unlike HTML tags, no double or single quotes are used in the tags. It is because CDML tags are often embedded as string literals in source code. The double or single quotes, if used, will conflict with the string literal quotes in the source code. Therefore in CDML, no quotes are necessary and they must not be used.

Also, unlike HTML tags, CDML uses the comma character as the delimiter between attributes. It is because certain attributes may contain embed spaces (such as the font file name). So space is not used as the delimiter and the comma character is used instead.

Blocks and Lines

In CMDL, a text string may contain multiple blocks. A block may contain multiple lines of text by separating them with new line characters ("\n") or with <*br*>. The latter is useful for programming languages that cannot represent new line characters easily.

For example, the line:

<*size=15*><*block*><*color=FF*>BLOCK<*br*>ONE<*/*> and <*block*><*color=FF00*>BLOCK<*br*>TWO<*/*>

will result in the following text rendered:


The above example contains a line of text. The line contains two blocks with the characters " and " in between. Each block in turn contains two lines. The blocks are defined using <*block*> as the start tag and <*/*> as the end tag.

Embedding Images

CDML supports embedding images in text using the following syntax:

<*img=my_image_file.png*>

where my_image_file.png is the path name of the image file.

For example, the line:

<*size=20*>A <*img=sun.png*> day

will result in the following text rendered:


ChartDirector will automatically detect the image file format using the file extension, which must either png, jpg, jpeg, gif, wbmp or wmp (case insensitive).

Please refer to BaseChart.setSearchPath or DrawArea.setSearchPath on the directory that ChartDirector will search for the file.

Blocks Alignment and Orientation

CDML supports nesting blocks, that is, a block can contain other sub-blocks. Attributes are supported in the <*block*> tag to control the alignment and orientation of the sub-blocks. The <*img=my_image_file.png*> is treated as a block for layout purposes.

For example, the line:

<*block,valign=absmiddle*><*img=molecule.png*> <*block*>Hydrazino\nMolecule<*/*><*/*>

will result in the following text rendered:


The the above starts <*block,valign=absmiddle*> which specifies its content should align with each others in the vertical direction using the absolute middle alignment. The block contains an image, followed by a space characters, and then another block which has two lines of text.

The following table describes the supported attributes inside <*block*> tag:

AttributeDescription
valign The vertical alignment of sub-blocks. This is for blocks that contain sub-blocks. Supported values are baseline, top, bottom, middle and absmiddle.

The value baseline means the baseline of sub-blocks should align with the baseline of the block. The baseline is the underline position of text. This is normal method of aligning text, and is the default in CDML. For images or blocks that are rotated, the baseline is the same as the bottom.

The value top means the top line of sub-blocks should align with the top line of the block.

The value bottom means the bottom line of sub-blocks should align with the bottom line of the block.

The value middle means the middle line of sub-blocks should align with the the middle line of the block. The middle line is the middle position between the top line and the baseline.

The value absmiddle means the absolute middle line of sub-blocks should align with the absolute middle line of the block. The absolute middle line is the middle position between the top line and the bottom line.
halign The horizontal alignment of lines. This is for blocks that contain multiple lines. Supported values are left, center and right.

The value left means the left border of each line should align with the left border of the block. This is the default.

The value center means the horizontal center of each line should align with the horizontal center of the block.

The value right means the right border of each line should align with the right border of the block.
angle Rotate the content of the block by an angle. The angle is specified in degrees in counter-clockwise direction.

© 2004 Advanced Software Engineering Limited. All rights reserved.
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