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Quick Overview

gc is the Nspire's graphic context. A graphics context is a module that has a handle to the script’s graphics output window and a library of graphics routines that are used to draw on the window. A graphics context is supplied to the script ”on.paint” event handler each time the window needs to be redrawn. The graphics context employs a pixel-based coordinate system with the origin in the upper left corner of the drawing window.

  • gc:clipRect(op, x, y, width, height) - Sets the clipping rectangle for subsequent graphics operations.
  • gc:drawArc(x, y, width, height, start angle, finish angle).
  • gc:drawImage(image,x,y) First argument in format “TI.Image”, x and y the coords.
  • gc:drawLine(xstart, ystart, xend, yend) Draws a line starting at the point (xstart,ystart) and ending at the point (xend, yend)
  • gc:drawPolyLine(int list1 [,int list2, .., int listN]) Draws a shape from a list contaning successively the x and y coordinates of each point the line have to draw.
  • gc:drawRect(x, y, xwidth, yheight) Draws a rectangle at (x,y) with the “x” side being “xwidth” long and the “y” side being “yheight” long
  • gc:drawString(string, x, y, position) position is the string’s anchor point and can be "baseline", “bottom”, “middle”, or “top”.
  • gc:fillArc(x, y, width, height, start angle, finish angle) see gc:drawArc
  • gc:fillPolygon(int list1 [,int list2, .., int listN]) see gc:drawPolyLine
  • gc:fillRect(x, y, width, height) see gc:drawRect
  • gc:getStringHeight(string) - Returns the string's height.
  • gc:getStringWidth(string) - Returns the string's width
  • gc:setAlpha(alpha) - where alpha is an integer between 0 and 255. Sets the transparency. Not available anymore
  • gc:setColorRGB(red, green, blue) RGB values are integers, from 0 to 255.
  • gc:setFont(font, type, size), with font : {“sansserif”, "serif", ..}, type {“b”, “r”, “i”}, size(int)
  • gc:setPen(thickness, smoothness) : thickness {“thin”, “medium”, "thick"}, smoothness {“smooth”, "dotted", "dashed"}