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-rw-r--r--loadgraph.c266
1 files changed, 266 insertions, 0 deletions
diff --git a/loadgraph.c b/loadgraph.c
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+++ b/loadgraph.c
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+/*
+ * Simple Load Graph
+ * Version 0.1 - Wed, Jan 11 2006
+ * - initial release
+ * Version 0.1.1 - Fri, Jan 13 2006
+ * - fixes autoscaling
+ * - add color
+ *
+ * Copyright (C) 2006 Leandro A. F. Pereira <leandro@linuxmag.com.br>
+ *
+ * The Simple Load Graph is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License, version 2.1, as published by the Free Software Foundation.
+ *
+ * The Simple Load Graph 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the Simple Load Graph; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#include "loadgraph.h"
+
+static void _draw(LoadGraph *lg);
+
+LoadGraph *load_graph_new(gint size)
+{
+ LoadGraph *lg;
+
+ lg = g_new0(LoadGraph, 1);
+
+ lg->area = gtk_drawing_area_new();
+ lg->size = size;
+ lg->data = g_new0(gint, size);
+
+ lg->scale = 1.0;
+
+ lg->width = size * 4;
+ lg->height = size * 2;
+
+ gtk_widget_set_size_request(lg->area, lg->width, lg->height);
+ gtk_widget_show(lg->area);
+
+ return lg;
+}
+
+GtkWidget *load_graph_get_framed(LoadGraph *lg)
+{
+ GtkWidget *align, *frame;
+
+ align = gtk_alignment_new(0.5, 0.5, 0, 0);
+ gtk_widget_show(align);
+
+ frame = gtk_frame_new(NULL);
+ gtk_widget_show(frame);
+ gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
+
+ gtk_container_add(GTK_CONTAINER(align), frame);
+ gtk_container_add(GTK_CONTAINER(frame), lg->area);
+
+ return align;
+}
+
+void load_graph_clear(LoadGraph *lg)
+{
+ gint i;
+
+ for (i = 0; i < lg->size; i++)
+ lg->data[i] = 0;
+
+ lg->scale = 1.0;
+ _draw(lg);
+}
+
+void load_graph_set_color(LoadGraph *lg, LoadGraphColor color)
+{
+ lg->color = color;
+ gdk_rgb_gc_set_foreground(lg->trace, lg->color);
+}
+
+void load_graph_destroy(LoadGraph *lg)
+{
+ g_free(lg->data);
+ gtk_widget_destroy(lg->area);
+ gdk_pixmap_unref(lg->buf);
+ g_object_unref(lg->trace);
+ g_object_unref(lg->grid);
+ g_free(lg);
+}
+
+static gboolean _expose(GtkWidget *widget, GdkEventExpose *event,
+ gpointer user_data)
+{
+ LoadGraph *lg = (LoadGraph *)user_data;
+ GdkDrawable *draw = GDK_DRAWABLE(lg->buf);
+
+ gdk_draw_drawable(lg->area->window,
+ lg->area->style->white_gc,
+ draw,
+ 0, 0,
+ 0, 0,
+ lg->width, lg->height);
+ return FALSE;
+}
+
+void load_graph_configure_expose(LoadGraph *lg)
+{
+ /* creates the backing store pixmap */
+ gtk_widget_realize(lg->area);
+ lg->buf = gdk_pixmap_new(lg->area->window, lg->width, lg->height, -1);
+
+ /* create the graphic contexts */
+ lg->grid = gdk_gc_new(GDK_DRAWABLE(lg->buf));
+ lg->trace = gdk_gc_new(GDK_DRAWABLE(lg->buf));
+
+ /* the default color is green */
+ load_graph_set_color(lg, LG_COLOR_GREEN);
+
+ /* init graphic contexts */
+ gdk_gc_set_line_attributes(lg->grid,
+ 1, GDK_LINE_ON_OFF_DASH,
+ GDK_CAP_NOT_LAST,
+ GDK_JOIN_ROUND);
+ gdk_rgb_gc_set_foreground(lg->grid, 0x707070);
+
+ gdk_gc_set_line_attributes(lg->trace,
+ 2, GDK_LINE_SOLID,
+ GDK_CAP_NOT_LAST,
+ GDK_JOIN_ROUND);
+
+ /* configures the expose event */
+ g_signal_connect(G_OBJECT(lg->area), "expose-event",
+ (GCallback) _expose, lg);
+}
+
+static void
+_draw(LoadGraph *lg)
+{
+ GdkDrawable *draw = GDK_DRAWABLE(lg->buf);
+ gint i, d;
+
+ /* clears the drawing area */
+ gdk_draw_rectangle(draw, lg->area->style->black_gc,
+ TRUE, 0, 0, lg->width, lg->height);
+
+ /* horizontal bars; 25%, 50% and 75% */
+ d = lg->height / 4;
+ gdk_draw_line(draw, lg->grid, 0, d, lg->width, d);
+ d = lg->height / 2;
+ gdk_draw_line(draw, lg->grid, 0, d, lg->width, d);
+ d = 3 * (lg->height / 4);
+ gdk_draw_line(draw, lg->grid, 0, d, lg->width, d);
+
+ /* vertical bars */
+ for (i = lg->width, d = 0; i > 1; i--, d++)
+ if ((d % 45) == 0 && d)
+ gdk_draw_line(draw, lg->grid, i, 0, i, lg->height);
+
+ /* the graph */
+ for (i = 0; i < lg->size; i++) {
+ gint this = lg->height - lg->data[i];
+ gint next = lg->height - lg->data[i+1];
+
+ gdk_draw_line(draw, lg->trace, i * 4, this, i * 4 + 2,
+ (this + next) / 2);
+ gdk_draw_line(draw, lg->trace, i * 4 + 2, (this + next) / 2,
+ i * 4 + 4, next);
+ }
+
+ gtk_widget_queue_draw(lg->area);
+}
+
+static inline int
+_max(LoadGraph *lg)
+{
+ gint i;
+ gint max = 0;
+
+ for (i = 0; i < lg->size; i++) {
+ if (lg->data[i] > max)
+ max = lg->data[i];
+ }
+
+ return max;
+}
+
+void
+load_graph_update(LoadGraph *lg, gint value)
+{
+ gint i;
+
+ if (value < 0)
+ return;
+ else if (value > _max(lg) && value > lg->height) {
+ /* FIXME: make scale work correctly :P */
+ gfloat nscale = (gfloat)lg->height / ceilf((float)value * lg->scale);
+
+ while (value * nscale > lg->height) {
+ nscale *= .90;
+ }
+
+ if (nscale < lg->scale) {
+ lg->scale = nscale;
+
+ for (i = 0; i < lg->size; i++) {
+ lg->data[i] = (int)((float)lg->data[i] * lg->scale);
+ }
+ }
+ }
+
+ value = (int)ceilf((float)value * lg->scale);
+
+ /* shift-right our data */
+ for (i = 0; i < lg->size; i++) {
+ lg->data[i] = lg->data[i+1];
+ }
+
+ /* insert the updated value */
+ lg->data[i] = value;
+
+ /* redraw */
+ _draw(lg);
+}
+
+#ifdef LOADGRAPH_UNIT_TEST
+gboolean lg_update(gpointer d)
+{
+ LoadGraph *lg = (LoadGraph *)d;
+
+ int i = 0;
+ if ((rand() % 10) == 0) {
+ i = rand() % 1000 + 500;
+ }
+
+ load_graph_update(lg, rand() % 200 + i);
+
+ return TRUE;
+}
+
+int main(int argc, char **argv)
+{
+ LoadGraph *lg;
+ GtkWidget *window;
+
+ gtk_init(&argc, &argv);
+
+ window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+ gtk_widget_show(window);
+
+ lg = load_graph_new(100);
+ gtk_container_add(GTK_CONTAINER(window), lg->area);
+ load_graph_configure_expose(lg);
+
+ lg_update(lg);
+
+ g_timeout_add(100, lg_update, lg);
+
+ gtk_main();
+
+ return 0;
+}
+#endif
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