*/
#include <config.h>
+#include <math.h>
#include "gtkgl.h"
#include "grits-marker.h"
-/**
- * grits_marker_new:
- * @label: a short description of the marker
- *
- * Create a new GritsMarker which shows the given label when drawn.
- *
- * Returns: the new #GritsMarker.
- */
-GritsMarker *grits_marker_new(const gchar *label)
+/* Texture setup functions */
+static void render_point(GritsMarker *marker)
{
- //g_debug("GritsMarker: new - %s", label);
- static const gdouble OUTLINE = 2;
- static const gdouble RADIUS = 3;
- static const gdouble WIDTH = 128;
- static const gdouble HEIGHT = 32;
-
- GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
- marker->xoff = RADIUS+OUTLINE;
- marker->yoff = HEIGHT-(RADIUS+OUTLINE);
- marker->label = g_strdup(label);
- marker->cairo = cairo_create(cairo_image_surface_create(
- CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT));
-
- cairo_select_font_face(marker->cairo, "sans-serif",
- CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
- cairo_set_font_size(marker->cairo, 13);
-
/* Draw outline */
cairo_set_source_rgba(marker->cairo, 0, 0, 0, 1);
- cairo_set_line_width(marker->cairo, OUTLINE*2);
+ cairo_set_line_width(marker->cairo, marker->outline*2);
- cairo_arc(marker->cairo, marker->xoff, marker->yoff, RADIUS, 0, 2*G_PI);
+ cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
+ 0, 2*G_PI);
cairo_stroke(marker->cairo);
- cairo_move_to(marker->cairo, marker->xoff+4, marker->yoff-8);
+ /* Draw filler */
+ cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
+
+ cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
+ 0, 2*G_PI);
+ cairo_fill(marker->cairo);
+}
+
+static void render_label(GritsMarker *marker)
+{
+ g_assert(marker->label);
+
+ cairo_set_source_rgba(marker->cairo, 0, 0, 0, 1);
+ cairo_select_font_face(marker->cairo, "sans-serif",
+ CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
+ cairo_set_font_size(marker->cairo, 13);
+ cairo_move_to(marker->cairo, marker->xoff + (marker->icon_width / 2),
+ marker->yoff - (marker->icon_height / 2));
cairo_text_path(marker->cairo, marker->label);
cairo_stroke(marker->cairo);
/* Draw filler */
cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
+ cairo_move_to(marker->cairo, marker->xoff + (marker->icon_width / 2),
+ marker->yoff - (marker->icon_height / 2));
+ cairo_show_text(marker->cairo, marker->label);
+}
- cairo_arc(marker->cairo, marker->xoff, marker->yoff, RADIUS, 0, 2*G_PI);
- cairo_fill(marker->cairo);
+static void render_icon(GritsMarker *marker)
+{
+ g_assert(marker->icon_img != NULL);
- cairo_move_to(marker->cairo, marker->xoff+4, marker->yoff-8);
- cairo_show_text(marker->cairo, marker->label);
+ /* This code assumes the icon is an image pointing toward 0 degrees
+ * (ie. north/up). If marker->flip is set, then it will rotate the
+ * icon appropriately then reflect it across the vertical axis so
+ * it's never upside down. */
+ gdouble flip = 1.0;
+ gdouble angle = marker->angle % 360;
+ if (marker->flip && (angle < 360 && angle > 180)) {
+ /* if icon rotates to the left half it will be upside down */
+ flip = -1.0; /* flip horizontally */
+ }
+
+ cairo_save(marker->cairo);
+
+ /* move to marker location */
+ cairo_translate(marker->cairo, marker->xoff, marker->yoff);
+
+ /* perform rotation and flip in one transformation */
+ gdouble C = cos(angle*(M_PI/180.0));
+ gdouble S = sin(angle*(M_PI/180.0));
+ gdouble fx = flip;
+ gdouble fy = 1.0;
+ gdouble tx = 0.0;
+ gdouble ty = 0.0;
+ cairo_matrix_t matrix;
+ cairo_matrix_init(&matrix,
+ fx*C, fx*S,
+ -S*fy, C*fy,
+ C*tx*(1-fx)-S*ty*(fy-1)+tx-C*tx+S*ty,
+ S*tx*(1-fx)+C*ty*(fy-1)+ty-S*tx-C*ty);
+ cairo_transform(marker->cairo, &matrix);
+
+ /* center image */
+ cairo_translate(marker->cairo, -marker->icon_width/2,
+ -marker->icon_height/2);
+
+ cairo_set_source_surface(marker->cairo, marker->icon_img, 0, 0);
+
+ cairo_paint(marker->cairo);
+ cairo_restore(marker->cairo);
+}
+
+static void render_all(GritsMarker *marker)
+{
+ g_assert(marker);
+ if (marker->display_mask & GRITS_MARKER_DMASK_ICON)
+ render_icon(marker);
+
+ if (marker->display_mask & GRITS_MARKER_DMASK_POINT)
+ render_point(marker);
+
+ if (marker->display_mask & GRITS_MARKER_DMASK_LABEL)
+ render_label(marker);
/* Load GL texture */
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, marker->tex);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
- glTexImage2D(GL_TEXTURE_2D, 0, 4, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE,
- cairo_image_surface_get_data(cairo_get_target(marker->cairo)));
+ glTexImage2D(GL_TEXTURE_2D, 0, 4, marker->width, marker->height,
+ 0, GL_BGRA, GL_UNSIGNED_BYTE,
+ cairo_image_surface_get_data(cairo_get_target(marker->cairo)));
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+}
+
+
+/* Constructors */
+/**
+ * grits_marker_new:
+ * @label: a short description of the marker
+ *
+ * Create a new GritsMarker which shows the given label when drawn.
+ *
+ * Returns: the new #GritsMarker.
+ */
+GritsMarker *grits_marker_new(const gchar *label)
+{
+ GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
+
+ marker->display_mask = GRITS_MARKER_DMASK_POINT |
+ GRITS_MARKER_DMASK_LABEL;
+
+ //g_debug("GritsMarker: new - %s", label);
+ /* specify size of point and size of surface */
+ marker->outline = 2;
+ marker->radius = 3;
+ marker->width = 128;
+ marker->height = 32;
+ marker->icon_width = marker->radius * 2;
+ marker->icon_height = marker->radius * 3;
+
+ marker->xoff = marker->radius+marker->outline;
+ marker->yoff = marker->height-(marker->radius+marker->outline);
+ marker->cairo = cairo_create(cairo_image_surface_create(
+ CAIRO_FORMAT_ARGB32, marker->width, marker->height));
+
+ marker->label = g_strdup(label);
+
+ render_all(marker);
+
+ return marker;
+}
+
+/**
+ * grits_marker_icon_new:
+ * @label: The label to display if GRITS_MARKER_DMASK_LABEL is set
+ * @filename: The filename of the icon
+ * @angle: The angle to rotate the icon (0 is north)
+ * @flip: Whether to flip the image so that it's never upside down.
+ * Useful for non-symmetric icons which have an "up".
+ * @display_mask: A bitmask which specifies which items to display.
+ *
+ * Create a new marker with a label, point, icon (png), or any
+ * combination of the above.
+ *
+ * Returns: the new #GritsMarker
+ */
+GritsMarker *grits_marker_icon_new(const gchar *label, const gchar *filename,
+ guint angle, gboolean flip, guint display_mask)
+{
+ GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
+
+ marker->label = g_strdup(label);
+ marker->angle = angle;
+ marker->flip = flip;
+ marker->display_mask = display_mask;
+
+ if (display_mask & GRITS_MARKER_DMASK_ICON) {
+ g_assert(filename != NULL);
+ g_debug("GritsMarker: marker_icon_new - marker image %s",
+ filename);
+ marker->icon_img = cairo_image_surface_create_from_png(filename);
+ if (cairo_surface_status(marker->icon_img)) {
+ g_warning("GritsMarker: marker_icon_new - "
+ "error reading file %s", filename);
+ /* convert it to a point, better than nothing */
+ marker->display_mask &= ~GRITS_MARKER_DMASK_ICON;
+ marker->display_mask |= GRITS_MARKER_DMASK_POINT;
+ marker->icon_width = 4;
+ marker->icon_height = 8;
+
+ } else {
+ marker->icon_width =
+ cairo_image_surface_get_width(marker->icon_img);
+ marker->icon_height =
+ cairo_image_surface_get_height(marker->icon_img);
+ }
+ } else {
+ marker->icon_img = NULL;
+ marker->icon_width = 4; /* room for the point if there is one */
+ marker->icon_height = 8;
+ }
+ g_debug("GritsMarker: marker_icon_new - width = %d, height = %d",
+ marker->icon_width, marker->icon_height);
+
+ marker->outline = 2;
+ marker->radius = 3;
+ /* this is the surface size, a guess really */
+ marker->width = marker->icon_width + 128;
+ marker->height = marker->icon_height + 64;
+
+ marker->xoff = marker->width/2;
+ marker->yoff = marker->height/2;
+ marker->cairo = cairo_create(cairo_image_surface_create(
+ CAIRO_FORMAT_ARGB32, marker->width, marker->height));
+ /* clear the surface just in case */
+ cairo_set_operator(marker->cairo, CAIRO_OPERATOR_SOURCE);
+ //cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.3); // debug
+ cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.0);
+ cairo_paint(marker->cairo);
+ cairo_set_operator(marker->cairo, CAIRO_OPERATOR_OVER);
+
+ render_all(marker);
+
+ if (marker->icon_img)
+ cairo_surface_destroy(marker->icon_img);
return marker;
}
+
/* Drawing */
static void grits_marker_draw(GritsObject *_marker, GritsOpenGL *opengl)
{
glEnd();
}
+
/* GObject code */
G_DEFINE_TYPE(GritsMarker, grits_marker, GRITS_TYPE_OBJECT);
static void grits_marker_init(GritsMarker *marker)
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