#### generate-graph-from-graph-spec Functions

##### Summary

Create a basic-graph-spec object.

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
 function⇩ A function of two arguments x and y. start-x⇩, step-x⇩, range⇩ Real numbers. color⇩ A color specification in the Color system. thickness⇩ A positive real numbers. name⇩ A Lisp object. x-offset⇩, y-offset⇩, x-scale⇩, y-scale⇩ Real numbers. var1⇩, var2⇩, var3⇩, var4⇩, var5⇩, var6⇩ Lisp objects. object⇩ A Lisp object. basic-graph-spec⇩ A basic-graph-spec object.
##### Values
 basic-graph-spec A basic-graph-spec object. boolean A boolean. drawing-object
##### 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.