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canvas-simpleline.c

#include <stdio.h>
#include <math.h>
#include <gtk-canvas.h>

#include "canvas-simpleline.h"
#include "rgb_macros.h"

enum {
      ARG_0,
      ARG_X1,
      ARG_Y1,
      ARG_X2,
      ARG_Y2,
      ARG_COLOR_RGBA
};

static void gtk_canvas_simpleline_class_init (GtkCanvasSimpleLineClass *class);
static void gtk_canvas_simpleline_init       (GtkCanvasSimpleLine      *simpleline);
static void gtk_canvas_simpleline_set_arg    (GtkObject              *object,
                                    GtkArg                 *arg,
                                    guint                   arg_id);
static void gtk_canvas_simpleline_get_arg    (GtkObject              *object,
                                    GtkArg                 *arg,
                                    guint                   arg_id);

static void   gtk_canvas_simpleline_update      (GtkCanvasItem *item, double *affine, ArtSVP *clip_path, int flags);
static void   gtk_canvas_simpleline_bounds      (GtkCanvasItem *item, double *x1, double *y1, double *x2, double *y2);
static double gtk_canvas_simpleline_point (GtkCanvasItem *item, double x, double y, int cx, int cy, GtkCanvasItem **actual_item);
static void   gtk_canvas_simpleline_render (GtkCanvasItem *item, GtkCanvasBuf *buf);
static void   gtk_canvas_simpleline_draw (GtkCanvasItem *item, GdkDrawable *drawable, int x, int y, int w, int h);

static GtkCanvasItemClass *parent_class;


GtkType
gtk_canvas_simpleline_get_type (void)
{
      static GtkType simpleline_type = 0;

      if (!simpleline_type) {
            GtkTypeInfo simpleline_info = {
                  "GtkCanvasSimpleLine",
                  sizeof (GtkCanvasSimpleLine),
                  sizeof (GtkCanvasSimpleLineClass),
                  (GtkClassInitFunc) gtk_canvas_simpleline_class_init,
                  (GtkObjectInitFunc) gtk_canvas_simpleline_init,
                  NULL, /* reserved_1 */
                  NULL, /* reserved_2 */
                  (GtkClassInitFunc) NULL
            };

            simpleline_type = gtk_type_unique (gtk_canvas_item_get_type (), &simpleline_info);
      }

      return simpleline_type;
}

static void
gtk_canvas_simpleline_class_init (GtkCanvasSimpleLineClass *class)
{
      GtkObjectClass *object_class;
      GtkCanvasItemClass *item_class;

      object_class = (GtkObjectClass *) class;
      item_class = (GtkCanvasItemClass *) class;

      parent_class = gtk_type_class (gtk_canvas_item_get_type ());

      gtk_object_add_arg_type ("GtkCanvasSimpleLine::x1", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X1);
      gtk_object_add_arg_type ("GtkCanvasSimpleLine::y1", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y1);
      gtk_object_add_arg_type ("GtkCanvasSimpleLine::x2", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X2);
      gtk_object_add_arg_type ("GtkCanvasSimpleLine::y2", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y2);
      gtk_object_add_arg_type ("GtkCanvasSimpleLine::color_rgba", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_COLOR_RGBA);

      object_class->set_arg = gtk_canvas_simpleline_set_arg;
      object_class->get_arg = gtk_canvas_simpleline_get_arg;

      item_class->update = gtk_canvas_simpleline_update;
      item_class->bounds = gtk_canvas_simpleline_bounds;
      item_class->point = gtk_canvas_simpleline_point;
      item_class->render = gtk_canvas_simpleline_render;
      item_class->draw = gtk_canvas_simpleline_draw;
}

static void
gtk_canvas_simpleline_init (GtkCanvasSimpleLine *simpleline)
{
      simpleline->x1 = 0.0;
      simpleline->y1 = 0.0;
      simpleline->x2 = 0.0;
      simpleline->y2 = 0.0;
      simpleline->color = RGBA_TO_UINT(98,123,174,241);
      simpleline->horizontal = TRUE; /* reset in the _update() method */
      GTK_CANVAS_ITEM(simpleline)->object.flags |= GTK_CANVAS_ITEM_NO_AUTO_REDRAW;
}

static void
gtk_canvas_simpleline_bounds_world (GtkCanvasItem *item, int* ix1, int* iy1, int* ix2, int* iy2)
{
      double x1, x2, y1, y2;
      ArtPoint i1, i2;
      ArtPoint w1, w2;
      double i2w[6];
      GtkCanvasSimpleLine *simpleline = GTK_CANVAS_SIMPLELINE(item);

      gtk_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);

      i1.x = x1;
      i1.y = y1;
      i2.x = x2;
      i2.y = y2;
      
      gtk_canvas_item_i2w_affine (item, i2w);
      art_affine_point (&w1, &i1, i2w);
      art_affine_point (&w2, &i2, i2w);

      *ix1 = (int) rint(w1.x);
      *ix2 = (int) rint(w2.x);
      *iy1 = (int) rint(w1.y);
      *iy2 = (int) rint(w2.y);

      /* the update rect has to be of non-zero width and height */

      if (x1 == x2) {
            simpleline->horizontal = FALSE;
            *ix2 += 1;
      } else {
            simpleline->horizontal = TRUE;
            *iy2 += 1;
      }
}

static void 
gtk_canvas_simpleline_reset_bounds (GtkCanvasItem *item)
{
      int Ix1, Ix2, Iy1, Iy2;

      gtk_canvas_simpleline_bounds_world (item, &Ix1, &Iy1, &Ix2, &Iy2);
      gtk_canvas_update_bbox (item, Ix1, Iy1, Ix2, Iy2);
}

/* 
 * CANVAS CALLBACKS 
 */

static void
gtk_canvas_simpleline_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
      GtkCanvasItem *item;
      GtkCanvasSimpleLine *simpleline;
      int redraw;
      int calc_bounds;

      item = GTK_CANVAS_ITEM (object);
      simpleline = GTK_CANVAS_SIMPLELINE (object);

      redraw = FALSE;
      calc_bounds = FALSE;

      switch (arg_id) {
      case ARG_X1:
              if (simpleline->x1 != GTK_VALUE_DOUBLE (*arg)) {
                    simpleline->x1 = GTK_VALUE_DOUBLE (*arg);
                  calc_bounds = TRUE;
            }
            break;

      case ARG_Y1:
              if (simpleline->y1 != GTK_VALUE_DOUBLE (*arg)) {
                    simpleline->y1 = GTK_VALUE_DOUBLE (*arg);
                  calc_bounds = TRUE;
            }
            break;

      case ARG_X2:
              if (simpleline->x2 != GTK_VALUE_DOUBLE (*arg)) {
                    simpleline->x2 = GTK_VALUE_DOUBLE (*arg);
                  calc_bounds = TRUE;
            }
            break;

      case ARG_Y2:
              if (simpleline->y2 != GTK_VALUE_DOUBLE (*arg)) {
                    simpleline->y2 = GTK_VALUE_DOUBLE (*arg);
                  calc_bounds = TRUE;
            }
            break;

      case ARG_COLOR_RGBA:
            if (simpleline->color != GTK_VALUE_INT(*arg)) {
                  simpleline->color = GTK_VALUE_INT(*arg);
                  UINT_TO_RGBA (simpleline->color, &simpleline->r, &simpleline->g, &simpleline->b, &simpleline->a);
                  redraw = TRUE;
            }
            break;

      default:
            break;
      }
      
      if (calc_bounds) {

            gtk_canvas_item_request_update (item);

      } else if (redraw) {

            int Ix1, Ix2, Iy1, Iy2;
            gtk_canvas_simpleline_bounds_world (item, &Ix1, &Iy1, &Ix2, &Iy2);
            gtk_canvas_request_redraw (item->canvas, Ix1, Iy1, Ix2, Iy2);
      }
}

static void
gtk_canvas_simpleline_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
      GtkCanvasSimpleLine *simpleline;

      simpleline = GTK_CANVAS_SIMPLELINE (object);

      switch (arg_id) {
      case ARG_X1:
            GTK_VALUE_DOUBLE (*arg) = simpleline->x1;
            break;
      case ARG_Y1:
            GTK_VALUE_DOUBLE (*arg) = simpleline->y1;
            break;
      case ARG_X2:
            GTK_VALUE_DOUBLE (*arg) = simpleline->x2;
            break;
      case ARG_Y2:
            GTK_VALUE_DOUBLE (*arg) = simpleline->y2;
            break;
      case ARG_COLOR_RGBA:
            GTK_VALUE_INT (*arg) = simpleline->color;
            break;
      default:
            arg->type = GTK_TYPE_INVALID;
            break;
      }
}

static void
gtk_canvas_simpleline_update (GtkCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
      GtkCanvasSimpleLine *simpleline;
      double x;
      double y;

      simpleline = GTK_CANVAS_SIMPLELINE (item);

      if (parent_class->update)
            (* parent_class->update) (item, affine, clip_path, flags);

      gtk_canvas_simpleline_reset_bounds (item);

      x = simpleline->x1;
      y = simpleline->y1;

      gtk_canvas_item_i2w (item, &x, &y);
      gtk_canvas_w2c (GTK_CANVAS(item->canvas), x, y, &simpleline->bbox_ulx, &simpleline->bbox_uly);

      x = simpleline->x2;
      y = simpleline->y2;

      gtk_canvas_item_i2w (item, &x, &y);
      gtk_canvas_w2c (GTK_CANVAS(item->canvas), x, y, &simpleline->bbox_lrx, &simpleline->bbox_lry);
}

static void
gtk_canvas_simpleline_render (GtkCanvasItem *item,
                        GtkCanvasBuf *buf)
{
      GtkCanvasSimpleLine *simpleline;
      int end, begin;

      simpleline = GTK_CANVAS_SIMPLELINE (item);

      if (parent_class->render) {
            (*parent_class->render) (item, buf);
      }

      if (buf->is_bg) {
            gtk_canvas_buf_ensure_buf (buf);
            buf->is_bg = FALSE;
      }

      // begin = MAX(simpleline->bbox_ulx,buf->rect.x0);
      // end = MIN(simpleline->bbox_lrx,buf->rect.x1);
      
      begin = simpleline->bbox_ulx;
      end = simpleline->bbox_lrx;

      if (simpleline->color != 0) {
            if (simpleline->horizontal) {
                  PAINT_HORIZA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a, 
                             begin, end, simpleline->bbox_uly);
            } else {
                  PAINT_VERTA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a, 
                            begin, simpleline->bbox_uly, simpleline->bbox_lry);
            }
      }
}

static void
gtk_canvas_simpleline_draw (GtkCanvasItem *item,
                      GdkDrawable *drawable,
                      int x, int y,
                      int width, int height)
{
      GtkCanvasSimpleLine *simpleline;

      simpleline = GTK_CANVAS_SIMPLELINE (item);

      if (parent_class->draw) {
            (* parent_class->draw) (item, drawable, x, y, width, height);
      }

      fprintf (stderr, "please don't use the CanvasSimpleLine item in a non-aa Canvas\n");
      abort ();
}

static void
gtk_canvas_simpleline_bounds (GtkCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
      GtkCanvasSimpleLine *simpleline = GTK_CANVAS_SIMPLELINE (item);

      *x1 = simpleline->x1;
      *y1 = simpleline->y1;
      *x2 = simpleline->x2;
      *y2 = simpleline->y2;
}

static double
gtk_canvas_simpleline_point (GtkCanvasItem *item, double x, double y, int cx, int cy, GtkCanvasItem **actual_item)
{
      GtkCanvasSimpleLine *simpleline;
      double x1, y1, x2, y2;
      double dx, dy;

      simpleline = GTK_CANVAS_SIMPLELINE (item);

      *actual_item = item;

      /* Find the bounds for the rectangle plus its outline width */

      gtk_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);

      /* Is point inside rectangle */
      
      if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
            return 0.0;
      }

      /* Point is outside rectangle */

      if (x < x1)
            dx = x1 - x;
      else if (x > x2)
            dx = x - x2;
      else
            dx = 0.0;

      if (y < y1)
            dy = y1 - y;
      else if (y > y2)
            dy = y - y2;
      else
            dy = 0.0;

      return sqrt (dx * dx + dy * dy);
}

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