* Added bezier routines.

[scdataviz] / graph.h

diff --git a/graph.h b/graph.h
index 3015d30..68aa97b 100644 (file)
--- a/graph.h
+++ b/graph.h
@@ -35,19 +35,28 @@ struct graph_point {
   double x;
   double y;
   GString *label;
-  /*the Bezier control point FROM HERE to the next point (P1)*/
-  double bezier_from_x;
-  double bezier_from_y;
-  /*the Bezier control point from previous point TO HERE (P2)*/
-  double bezier_to_x;
-  double bezier_to_y;
+};
+
+/*Bezier line*/
+struct graph_line {
+  /*First point*/
+  double p0_x;
+  double p0_y;
+  /*Control pts*/
+  double p1_x;
+  double p1_y;
+  double p2_x;
+  double p2_y;
+  /*End point*/
+  double p3_x;
+  double p3_y;
 };
 
 typedef struct _Graph {
   GObject parent_instance;
   /*Array of n_points sets of x,y coords*/
   GPtrArray *points;
-  /*If you want to, this will override the lines between the points.*/
+  /*This draws all of the lines (generally between points)*/
   GPtrArray *lines;
   double maxx;
   double minx;
@@ -70,5 +79,13 @@ typedef struct _GraphClass {
 Graph *graph_new(void);
 int graph_add_point(Graph* graph, double x, double y, const GString *label);
 int graph_add_graph_point(Graph* graph, struct graph_point *pt);
+int graph_add_line(Graph* graph, double p0_x, double p0_y, double p1_x, double p1_y, double p2_x, double p2_y, double p3_x, double p3_y);
+void graph_add_linear_connectors(Graph* graph);
+/*Provide x0, x3; x1 and x2 will be set*/
+void graph_bezier_linear_to_cubic(double x0, double x3, double *x1, double *x2);
+/*Provide x0, x1, x2.  x1 and x2 will be set appropriately.*/
+void graph_bezier_qudratic_to_cubic(double x0, double x3, double *x1, double *x2);
+
+
 
 #endif             /* !GRAPHCLASS_H_ */