DiaExpression

DiaExpression — A linear expression, part of a DiaConstraint.

Synopsis




            DiaExpression;
void        dia_expression_add              (DiaExpression **expr,
                                             DiaVariable *var,
                                             gdouble c);
void        dia_expression_add_expression   (DiaExpression **expr,
                                             DiaExpression *expr2);
void        dia_expression_times            (DiaExpression *expr,
                                             gdouble c);
void        dia_expression_free             (DiaExpression *expr);

Description

DiaExpression is a small data structure that holds a linear expression. The DiaConstraint class holds a DiaExpression. It is advised to use the DiaConstraint function rather than those functions directly.

Details

DiaExpression

typedef struct {
	guint len;

	struct _DiaExpressionElem
	{
		DiaVariable *variable;
		gdouble constant;
	} elem[1];
} DiaExpression;


dia_expression_add ()

void        dia_expression_add              (DiaExpression **expr,
                                             DiaVariable *var,
                                             gdouble c);

Add "c * var" to expr (expr = expr + (c * var)).

expr :
var :
c :

dia_expression_add_expression ()

void        dia_expression_add_expression   (DiaExpression **expr,
                                             DiaExpression *expr2);

Add expr2 to expr (expr = expr + expr2).

expr :
expr2 :

dia_expression_times ()

void        dia_expression_times            (DiaExpression *expr,
                                             gdouble c);

Multiply expr with value c (expr = expr * c).

expr :
c :

dia_expression_free ()

void        dia_expression_free             (DiaExpression *expr);

Free an expression.

expr :

See Also

DiaConstraint, DiaVariable