G_DEFINE_TYPE(GraphWidget, graph_widget, GTK_TYPE_DRAWING_AREA);
+#define INSET_PERCENT 0.1
+
struct drawing_context {
GtkWidget *widget;
cairo_t *cr;
double radius;
+ double xoffset;
+ double yoffset;
+ double xscaling;
+ double yscaling;
};
static void draw_point(gpointer data, gpointer user_data) {
- struct drawing_context *cxt = (struct drawing_context *) user_data;
- double *d = (double*)data;
- cairo_arc(cxt->cr, d[0], d[1], cxt->radius, 0, 2*M_PI);
+ struct drawing_context *cxt = user_data;
+ struct graph_point *pt = data;
+ double x = (pt->x + cxt->xoffset)*cxt->xscaling;
+ double y = (pt->y + cxt->yoffset)*cxt->yscaling;
+ cairo_move_to(cxt->cr, x, y);
+ cairo_arc(cxt->cr, x, y, cxt->radius, 0, 2*M_PI);
+ if(pt->label != NULL) {
+ cairo_save(cxt->cr);
+ cairo_scale(cxt->cr, 1, -1);
+ cairo_show_text(cxt->cr, pt->label->str);
+ cairo_restore(cxt->cr);
+ }
+}
+
+static void draw_lines(gpointer data, gpointer user_data) {
+ struct drawing_context *cxt = user_data;
+ struct graph_line *l = data;
+ double p0_x = (l->p0_x + cxt->xoffset)*cxt->xscaling;
+ double p0_y = (l->p0_y + cxt->yoffset)*cxt->yscaling;
+ double p1_x = (l->p1_x + cxt->xoffset)*cxt->xscaling;
+ double p1_y = (l->p1_y + cxt->yoffset)*cxt->yscaling;
+ double p2_x = (l->p2_x + cxt->xoffset)*cxt->xscaling;
+ double p2_y = (l->p2_y + cxt->yoffset)*cxt->yscaling;
+ double p3_x = (l->p3_x + cxt->xoffset)*cxt->xscaling;
+ double p3_y = (l->p3_y + cxt->yoffset)*cxt->yscaling;
+ #ifdef DEBUG_DRAW
+ fprintf(stderr, "draw_lines: p0_x=%g, p0_y=%g, p1_x=%g, p1_y=%g, p2_x=%g, p2_y=%g, p3_x=%g, p3_y=%g\n", p0_x, p0_y, p1_x, p1_y, p2_x, p2_y, p3_x, p3_y);
+ #endif
+ cairo_move_to(cxt->cr, p0_x, p0_y);
+ cairo_curve_to(cxt->cr, p1_x, p1_y, p2_x, p2_y, p3_x, p3_y);
+}
+
+static void draw_axis(gpointer data, gpointer user_data) {
+ struct graph_axis *xs = data;
+ struct drawing_context *cxt = user_data;
}
static void draw(GtkWidget *graph, cairo_t *cr) {
struct drawing_context cxt;
- #ifdef DEBUG
- fprintf(stderr, "draw(%d, %d)\n", graph, cr);
- fprintf(stderr, "allocation.x=%d, allocation.y=%d, allocation.height=%d, allocation.width=%d\n", graph->allocation.x, graph->allocation.y, graph->allocation.height, graph->allocation.width);
+ GraphWidget *gw = GRAPH_WIDGET(graph);
+ #ifdef DEBUG_DRAW
+ fprintf(stderr, "draw(%d, %d)\n", (int)graph, (int)cr);
+ fprintf(stderr, "allocation.x=%d, allocation.y=%d, allocation.height=%d, allocation.width=%d\n", graph->allocation.x, graph->allocation.y, graph->allocation.height, graph->allocation.width);
#endif
double x0=graph->allocation.x;
double y0=graph->allocation.y;
double height=graph->allocation.height;
double width=graph->allocation.width;
+ double minx = gw->graph->minx;
+ double maxx = gw->graph->maxx;
+ double miny = gw->graph->miny;
+ double maxy = gw->graph->maxy;
+ if(gw->graph->xaxis != NULL) {
+ minx = gw->graph->xaxis->major_start;
+ maxx = gw->graph->xaxis->major_start + gw->graph->xaxis->major_step*gw->graph->xaxis->major;
+ }
+ if(gw->graph->yaxis != NULL) {
+ miny = gw->graph->yaxis->major_start;
+ maxy = gw->graph->yaxis->major_start + gw->graph->yaxis->major_step*gw->graph->yaxis->major;
+ }
cxt.widget = graph;
cxt.cr = cr;
- cxt.radius = ((height < width)? height : width)*0.01;
+ cxt.radius = 0.01;
+ cxt.xscaling = (gw->graph->points->len == 1)? 1 : (1/(maxx - minx));
+ cxt.yscaling = (gw->graph->points->len == 1)? 1 : (1/(maxy - miny));
+ cxt.xoffset = (gw->graph->points->len == 1)? (-minx/2) : (-minx);
+ cxt.yoffset = (gw->graph->points->len == 1)? (-miny/2) : (-miny);
#ifdef DEBUG
+ fprintf(stderr, "minx=%g, maxx=%g, miny=%g, maxy=%g, xscaling=%g, yscaling=%g, xoffset=%g, yoffset=%g\n", minx, maxx, miny, maxy, cxt.xscaling, cxt.yscaling, cxt.xoffset, cxt.yoffset);
fprintf(stderr, "x0=%g, y0=%g, width=%g, height=%g\n", x0, y0, height, width);
- fprintf(stderr, "move_to(%d, %g->%g, %g->%g)\n", cr, graph_data[0], graph->allocation.x + graph_data[0]*(graph->allocation.width), graph_data[1], graph->allocation.y + graph_data[1]*(graph->allocation.height));
- #endif
+ fprintf(stderr, "translate=(%g, %g)\n", x0 + ((width>height)?(width-height)/2.0:0), y0+((width > height)?height:width) + ((height>width)?(height-width)/2.0:0));
+#endif
+ double offset_height = ((width>=height)?height*INSET_PERCENT:0);;
+ double offset_width = ((height>=width)?width*INSET_PERCENT:0);
+ double inset_height = height - offset_height;
+ double inset_width = width - offset_width;
cairo_save(cr);
- cairo_translate(cr, x0, y0);
- cairo_scale(cr, width, height);
- g_ptr_array_foreach(GRAPH_WIDGET(graph)->graph->points, &draw_point, (gpointer)&cxt);
+ cairo_translate(cr, x0 + ((inset_width>inset_height)?(inset_width-inset_height)/2.0:0) + offset_width/2, y0+((inset_width > inset_height)?inset_height:inset_width) + ((inset_width>=inset_height)?0:(inset_height-inset_width)/2.0) + offset_height/2 );
+ cairo_scale(cr, (inset_width > inset_height)?inset_height:inset_width, (inset_width > inset_height)?-inset_height:-inset_width);
+ cairo_set_line_width(cr, 0.005);
+ cairo_select_font_face (cr, "Georgia",
+ CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
+ cairo_set_font_size (cr, 0.05);
+ if(gw->graph->lines != NULL) {
+ cairo_set_source_rgba(cr, 0, 0, 0, 0.25);
+ g_ptr_array_foreach(gw->graph->lines, &draw_lines, (gpointer)&cxt);
+ cairo_stroke(cr);
+ }
+ cairo_set_source_rgb(cr, 1, 1, 1);
+ cairo_fill_preserve(cr);
cairo_set_source_rgb(cr, 0, 0, 0);
+ g_ptr_array_foreach(gw->graph->points, &draw_point, (gpointer)&cxt);
cairo_stroke(cr);
cairo_restore(cr);
}
Graph* graph_widget_get_graph(GraphWidget* gw) {
return gw->graph;
}
+
projects / scdataviz / blobdiff