+++ /dev/null
-/*
-** Graph.c
-**
-** Made by (Johnny Q. Hacker)
-** Login <solarion@johnathan>
-**
-
-
-
- Copyright (C) 2008 Joseph Pingenot
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU Affero General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-**Many thanks to Davyd Madeley for the excellent Cairo Widget Tutorial
-** at http://gnomejournal.org/article/34/writing-a-widget-using-cairo-and-gtk28
-
-** Started on Thu Jul 17 10:51:32 2008 Johnny Q. Hacker
-** Last update Thu Oct 8 17:13:50 2009 Johnny Q. Hacker
-*/
-
-#include <graphwidget.h>
-#include <math.h>
-
-G_DEFINE_TYPE(GraphWidget, graph_widget, GTK_TYPE_DRAWING_AREA);
-
-#define INSET_PERCENT 0.1
-#define TITLE_PERCENT 0.15
-#define DEBUG_DRAW_AXIS
-
-struct drawing_context {
- GtkWidget *widget;
- cairo_t *cr;
- double radius;
- double xoffset;
- double yoffset;
- double xscaling;
- double yscaling;
- /*Semi-normalized maxima*/
- 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_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(struct drawing_context* cxt, struct graph_axis *axis, double scaling, double offset, double max) {
- #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
- cairo_move_to(cxt->cr, 0, 0);
- cairo_line_to(cxt->cr, max, 0);
- register int i, j, k;
- register double pos, mpos, smpos;
- for(i=0; i<axis->major; i++) {
- 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);
- for(k=0; k<axis->subminor; k++) {
- smpos=(k+1)*(axis->major_step/(axis->minor+1)/(axis->subminor+1)) + pos;
- cairo_move_to(cxt->cr, (smpos + offset)*scaling, 0);
- cairo_line_to(cxt->cr, (smpos + offset)*scaling, 0.0125);
- }
- for(j=0; j<axis->minor; j++) {
- mpos=(j+1)*(axis->major_step/(axis->minor+1)) + pos;
- cairo_move_to(cxt->cr, (mpos + offset)*scaling, 0);
- cairo_line_to(cxt->cr, (mpos + offset)*scaling, 0.025);
- for(k=0; k<axis->subminor; k++) {
- smpos=(k+1)*(axis->major_step/(axis->minor+1)/(axis->subminor+1)) + mpos;
- cairo_move_to(cxt->cr, (smpos + offset)*scaling, 0);
- cairo_line_to(cxt->cr, (smpos + offset)*scaling, 0.0125);
- }
- }
- }
- 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);
-}
-
-static void draw(GtkWidget *graph, cairo_t *cr) {
- struct drawing_context cxt;
- 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 = 0.01;
- /*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;
- }else if(gw->graph->xaxis != NULL) {
- effective_height -= effective_height*TITLE_PERCENT;
- }else if(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);
- /*Finish up our context information.*/
- cxt.xscaling = (gw->graph->points->len == 1)? cxt.xmax : (cxt.xmax/(((maxx - minx)==0)?1:(maxx-minx)));
- cxt.yscaling = (gw->graph->points->len == 1)? cxt.ymax : (cxt.ymax/(((maxy - miny)==0)?1:(maxy-miny)));
- cxt.xoffset = (gw->graph->points->len == 1)? (-minx/2) : (-minx);
- cxt.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);
- #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;
- cairo_save(cr);
- cairo_translate(cr, x0 + (width - effective_width) - inset/2, y0 + effective_height + inset/2);
- cairo_scale(cr, effective_width/cxt.xmax, -effective_height/cxt.ymax);
- 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);
- if(gw->graph->xaxis != NULL)
- draw_axis(&cxt, gw->graph->xaxis, cxt.xscaling, cxt.xoffset, cxt.xmax);
- if(gw->graph->yaxis != NULL) {
- cairo_save(cr);
- cairo_matrix_t matrix = { .xx=0, .xy = 1, .x0 = 0, .yx = 1, .yy = 0, .y0 = 0 };
- cairo_transform(cr, &matrix);
- draw_axis(&cxt, gw->graph->yaxis, cxt.yscaling, cxt.yoffset, cxt.ymax);
- cairo_restore(cr);
- }
- cairo_stroke(cr);
- cairo_restore(cr);
-}
-
-static gboolean graph_widget_expose(GtkWidget *graph, GdkEventExpose *event) {
- cairo_t *cr = gdk_cairo_create(graph->window);
- cairo_rectangle(cr, event->area.x, event->area.y, event->area.width, event->area.height);
- cairo_clip(cr);
- draw(graph, cr);
- cairo_destroy(cr);
- return FALSE;
-}
-
-static void graph_widget_class_init(GraphWidgetClass *klass) {
- GtkWidgetClass *widget_class;
- widget_class = GTK_WIDGET_CLASS(klass);
- widget_class->expose_event = graph_widget_expose;
-}
-
-static void graph_widget_init(GraphWidget *graph) {
- /*Get a graph.*/
- graph->graph = graph_new();
-}
-
-GtkWidget *graph_widget_new(void) {
- return g_object_new(GRAPH_WIDGET_TYPE, NULL);
-}
-
-Graph* graph_widget_get_graph(GraphWidget* gw) {
- return gw->graph;
-}
-
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