HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 369

hp40g+.book Page 21 Friday, December 9, 2005 1:03 AM Example TLINE 0;0;3;3: Erases previously drawn 45 degree line from (0,0) to (3,3), or draws that line if it doesn't already exist. Graphic commands The graphic commands use the graphics variables G0 through G9-or the Page variable from Sketch-as graphicname arguments. The position argument takes the form (x,y). Position coordinates depend on the current aplet's scale, which is specified by Xmin, Xmax, Ymin, and Ymax. The upper left corner of the target graphic (graphic2) is at (Xmin,Ymax). You can capture the current display and store it in G0 by simultaneously pressing + . DISPLAY→ →DISPLAY Stores the current display in graphicname. DISPLAY→ graphicname: Displays graphic from graphicname in the display. →DISPLAY graphicname: →GROB Creates a graphic from expression, using font_size, and stores the resulting graphic in graphicname. Font sizes are 1, 2, or 3. If the fontsize argument is 0, the HP 40gs creates a graphic display like that created by the SHOW operation. →GROB graphicname;expression; fontsize: GROBNOT Replaces graphic in graphicname with bitwise-inverted graphic. GROBNOT graphicname: GROBOR Using the logical OR, superimposes graphicname2 onto graphicname1. The upper left corner of graphicname2 is placed at position. GROBOR graphicname1;(position);graphicname2: where position is expressed in terms of the current axes settings, not in terms of pixel postion. Programming 21-21