| We all know that the K-line chart of the stock website is a dynamically generated regular refresh PHP, which has the function of dynamically generating images. So how can we use Asp.net to dynamically generate an image on a webpage? The following example shows how to dynamically generate an image to display the current time. Namespace wmj { Using system; Using system. drawing; Using system. Web. UI; Public class mytempimage: Page { Public String createimage () { String STR = datetime. Now. tostring (); Bitmap image = new Bitmap (200,30 ); Graphics G = graphics. fromimage (image ); String thefullname = server. mappath ("/") + "\ nowtime.gif "; G. Clear (color. White ); G. drawstring (STR, new font ("Courier New", 10), new solidbrush (color. Red), 20, 5 ); // There are many drawing methods for graphics to draw straight lines, curves, circles, and so on. Image. Save (thefullname, system. Drawing. imaging. imageformat. GIF ); Return "/nowtime.gif "; } } } //////////////////////////////////////// /// <% @ Page Language = "C #" %> <% @ Import namespace = "wmj" %> <Script language = "C #" runat = "server"> Void page_load (Object sender, eventargs E) { Mytempimage = new mytempimage (); Img1.src = mytempimage. createimage (); } </SCRIPT> <HTML> <Head> <! -- Automatically refresh every 10 seconds --> <Meta http-equiv = "refresh" content = "10"> </Head> <Body> <Form runat = "server"> <Input type = "button" value = "manual refresh" onclick = "location. Reload ()"> </Form> </Body> </Html> With the principle of this example, it is not a problem to dynamically display the data curves, ratio pie charts, and column charts in the database. |
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