make-basic-graph-spec

basic-graph-spec-p

copy-basic-graph-spec

generate-graph-from-graph-spec Functions

Summary

Create a basic-graph-spec object.

Package

lw-gt

Signatures

make-basic-graph-spec function start-x step-x range &key color thickness name x-offset y-offset x-scale y-scale var1 var2 var3 var4 var5 var6 => basic-graph-spec

basic-graph-spec-p object => boolean

copy-basic-graph-spec basic-graph-spec => basic-graph-spec

generate-graph-from-graph-spec basic-graph-spec => drawing-object

Arguments

Values

Description

The function make-basic-graph-spec creates a basic-graph-spec object. This object can be modified by the basic-graph-spec-* accessors. The function generate-graph-from-graph-spec generates the graph using the current values in the basic-graph-spec object, which is a drawing-object which when drawn draws the graph, which means drawing a line between each two successive points.

function must be a function of two arguments: the basic-graph-spec and the x value. It needs to return the corresponding y value.

start-x, step-x and range define which x values to use: the first value is start-x, and then increase by step-x until the x is greater than (+ start-x range). For each x value, generate-graph-from-graph-spec calls function with basic-graph-spec and the x value to generate the y value.

x-scale and y-scale (default to 1) are used to scale the x and y after calling function, by multiplying the x and y by x-scale and y-scale respectively.

x-offset and y-offset (default to 0) are used to translate the scaled values of x and y by adding x-offset and y-offset to the scaled x and y.

The scaled and transformed pair x, y define a point. generate-graph-from-graph-spec then generates a drawing-object that draws a line between each two successive points.

thickness and color specify the thickness and the color of the lines. The lines are drawn with scale-thickness nil.

name, var1, var2, var3, var4, var5 AND var6 are arbitrary values, which you can use to store anything that the function needs to compute the y value. The system does not read or write them.

The function copy-basic-graph-spec can be used to copy a basic-graph-spec.

The fimctopm basic-graph-spec-p is the predicate, which returns true if object is a basic-graph-spec and false otherwise.

See also

basic-graph-spec
generate-graph-from-pairs
drawing-object
14.2 Higher level - drawing graphs and bar charts