G_DEFINE_TYPE(GraphWidget, graph_widget, GTK_TYPE_DRAWING_AREA);
#define INSET_PERCENT 0.1
+#define TITLE_PERCENT 0.1
#define DEBUG_DRAW_AXIS
struct drawing_context {
GtkWidget *widget;
cairo_t *cr;
double radius;
- double xoffset;
- double yoffset;
- double xscaling;
- double yscaling;
+ double xmax;
+ double ymax;
+ cairo_matrix_t data_scale;
+ cairo_matrix_t data_xlat;
};
static void draw_point(gpointer data, gpointer user_data) {
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_save(cxt->cr);
+ cairo_transform(cxt->cr, cxt->data_xlat);
+ cairo_transform(cxt->cr, cxt->data_scale);
+ double x = pt->x;
+ double y = pt->y;
cairo_move_to(cxt->cr, x, y);
cairo_arc(cxt->cr, x, y, cxt->radius, 0, 2*M_PI);
if(pt->label != NULL) {
cairo_show_text(cxt->cr, pt->label->str);
cairo_restore(cxt->cr);
}
+ cairo_restore;
}
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;
+ cairo_save(cxt->cr);
+ cairo_transform(cxt->cr, cxt->data_xlat);
+ cairo_transform(cxt->cr, cxt->data_scale);
+ double p0_x = l->p0_x;
+ double p0_y = l->p0_y;
+ double p1_x = l->p1_x;
+ double p1_y = l->p1_y;
+ double p2_x = l->p2_x;
+ double p2_y = l->p2_y;
+ double p3_x = l->p3_x;
+ double p3_y = l->p3_y;
#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);
+ cairo_restore(cxt->cr);
}
-static void draw_axis(struct drawing_context* cxt, struct graph_axis *axis, double scaling, double offset) {
+static void draw_axis(struct drawing_context* cxt, struct graph_axis *axis) {
+ cairo_save(cxt->cr);
+ cairo_transform(cxt->cr, cxt->data_xlat);
+ cairo_transform(cxt->cr, cxt->data_scale);
#ifdef DEBUG_DRAW_AXIS
fprintf(stderr, "draw_axis; major_start=%g, major_step=%g, >major=%d, minor=%d, subminor=%d, label=%s\n", axis->major_start, axis->major_step, axis->major, axis->minor, axis->subminor, axis->title->str);
#endif
pos=i*axis->major_step + axis->major_start;
cairo_move_to(cxt->cr, (pos + offset)*scaling, 0);
cairo_line_to(cxt->cr, (pos + offset)*scaling, 0.05);
+ cairo_restore(cxt->cr);
}
static void draw(GtkWidget *graph, cairo_t *cr) {
cxt.widget = graph;
cxt.cr = cr;
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, "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;
+ /*Set up our semi-normalized scaling. The shortest direction range
+ [0, 1]; the other range depends upon the relative sizes.*/
+ double effective_height = height;
+ double effective_width = width;
+ double inset, axis_inset;
+ if((INSET_PERCENT > 0) && (INSET_PERCENT < 1.0)) {
+ inset = ((effective_height > effective_width)?effective_width:effective_height)*INSET_PERCENT;
+ effective_height -= inset;
+ effective_width -= inset;
+ }
+ if((gw->graph->xaxis != NULL) && (gw->graph->yaxis != NULL)) {
+ /*key off the smaller size.*/
+ axis_inset = ((effective_height > effective_width)?effective_width:effective_height)*TITLE_PERCENT;
+ effective_height -= axis_inset;
+ effective_width -= axis_inset;
+ }elsif(gw->graph->xaxis != NULL) {
+ effective_height -= effective_height*TITLE_PERCENT;
+ }elsif(gw->graph->yaxis != NULL) {
+ effective_width -= effective_width*TITLE_PERCENT;
+ }
+ if(effective_width > effective_height) {
+ cxt.xmax = effective_width/effective_height;
+ cxt.ymax = 1.0;
+ }else{
+ cxt.xmax = 1.0;
+ cxt.ymax = effective_height/effective_width;
+ }
+ /*Convert from data space to the semi-normalized space*/
+ double xscaling = (gw->graph->points->len == 1)? cxt.xmax : (cxt.xmax/(maxx-minx));
+ double yscaling = (gw->graph->points->len == 1)? cxt.ymax : (cxt.ymax/(maxy-miny));
+ double xoffset = (gw->graph->points->len == 1)? (-minx/2) : (-minx);
+ double yoffset = (gw->graph->points->len == 1)? (-miny/2) : (-miny);
+ cairo_matrix_translate(&(cxt.data_xlat), xoffset, yoffset);
+ cairo_matrix_scale(&(cxt.data_scale), xscaling, yscaling);
cairo_save(cr);
- 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_translate(cr, effective_width - inset/2, effective_height - inset/2);
+ cairo_scale(cr, effective_width, effective_height);
cairo_set_line_width(cr, 0.005);
- cairo_select_font_face (cr, "Georgia",
+ cairo_select_font_face (cr, "Sans Serif",
CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size (cr, 0.05);
if(gw->graph->lines != NULL) {
projects / scdataviz / blobdiff