Rice Lake iRite IDE - Manual (Page 72)

68 920i Programming Reference
Example:
G_Graph1 : DisplayImage;
result : Syscode;
begin
result := GraphCreate(1, G_Graph1, Black, Bar);
if result = SysOK then
result :=GraphInit(71,30,60,110,240);
end if;
end;
GraphInit
GraphInit sets the location of the graph on the display. x_start and y_start values specify the distance, in
pixels, from top left corner of the display at which the top left corner of the graph is shown. height and width
specify the graph size, in pixels. (Full display size is 240 pixels high by 320 pixels wide.)
Method Signature:
function GraphInit (graphic_no : Integer; x_start : Integer; y_start : Integer;
height : Integer; width : Integer) : SysCode;
Parameters:
[in] graphic_no Graphic number
[in] x_start X-axis starting pixel location
[in] y_start Y-axis starting pixel location
[in] bitmap Graphic bitmap
[in] color Color type
[in] height Graphic height
[in] width Graphic width
SysCode values returned:
SysInvalidRequest The DisplayImage specified by bitmap does not exist.
SysOutOfRange Specified parameters exceed display height or width, or are too small to
accommodate the graphic.
SysDeviceError Internal error
SysOK The function completed successfully.
Example:
G_Graph1 : DisplayImage;
result : Syscode;
begin
result := GraphCreate(1, G_Graph1, Black, Bar);
if result = SysOK then
result :=GraphInit(71,30,60,110,240);
end if;
end;
GraphPlot
GraphPlot plots the graph previously set up using the GraphCreate, GraphInit, and GraphScale functions. The
graph appears as a histogram: each GraphPlot call places a bar or line at the right edge of the graph, moving
values from previous calls to the left. The width of the bar, in pixels, is specified by
width parameter. The
maximum width value is 8; larger values are reduced to 8. If the y_value is beyond the bounds set by
GraphScale, the bar is plotted to the maximum or minimum value.
Method Signature:
function GraphPlot (graphic_no : Integer; y_value : Real; width : Integer; color :
Color_type) : SysCode;
Parameters:
[in] graphic_no Graphic number
[in] y_value Pixel height of histogram
[in] color Color type
[in] width Pixel width of moving bar