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index 2f986f16f748e35c83c125db224fd789be07b0c2..9dfbed9255b9089dfede98270c5e86e0e3b1c454 100644 (file)
-#define SP_CANVAS_AXONOMGRID_C\r
-\r
-/*\r
- * SPCAxonomGrid\r
- *\r
- * Copyright (C) 2006 Johan Engelen <johan@shouraizou.nl>\r
- * Copyright (C) 2000 Lauris Kaplinski\r
- *\r
- */ \r
- \r
- /* \r
- * Current limits are: one axis (y-axis) is always vertical. The other two\r
- * axes are bound to a certain range of angles. The z-axis always has an angle \r
- * smaller than 90 degrees (measured from horizontal, 0 degrees being a line extending\r
- * to the right). The x-axis will always have an angle between 0 and 90 degrees.\r
- * When I quickly think about it: all possibilities are probably covered this way. Eg.\r
- * a z-axis with negative angle can be replaced with an x-axis, etc.\r
- */ \r
- \r
- /*\r
- * TODO: LOTS LOTS LOTS. Optimization etc.\r
- *\r
- */\r
-\r
-#include "sp-canvas-util.h"\r
-#include "canvas-axonomgrid.h"\r
-#include "display-forward.h"\r
-#include <libnr/nr-pixops.h>\r
-\r
-#define SAFE_SETPIXEL //undefine this when it is certain that setpixel is never called with invalid params\r
-\r
-enum {\r
- ARG_0,\r
- ARG_ORIGINX,\r
- ARG_ORIGINY,\r
- ARG_ANGLEX,\r
- ARG_SPACINGY,\r
- ARG_ANGLEZ,\r
- ARG_COLOR,\r
- ARG_EMPCOLOR,\r
- ARG_EMPSPACING\r
-};\r
-\r
-enum Dim3 { X=0, Y, Z };\r
-\r
-#ifndef M_PI\r
-#define M_PI 3.14159265358979323846\r
-#endif\r
-\r
-static double deg_to_rad(double deg) { return deg*M_PI/180.0;}\r
-\r
-\r
-static void sp_caxonomgrid_class_init (SPCAxonomGridClass *klass);\r
-static void sp_caxonomgrid_init (SPCAxonomGrid *grid);\r
-static void sp_caxonomgrid_destroy (GtkObject *object);\r
-static void sp_caxonomgrid_set_arg (GtkObject *object, GtkArg *arg, guint arg_id);\r
-\r
-static void sp_caxonomgrid_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags);\r
-static void sp_caxonomgrid_render (SPCanvasItem *item, SPCanvasBuf *buf);\r
-\r
-static SPCanvasItemClass * parent_class;\r
-\r
-GtkType\r
-sp_caxonomgrid_get_type (void)\r
-{\r
- static GtkType caxonomgrid_type = 0;\r
-\r
- if (!caxonomgrid_type) {\r
- GtkTypeInfo caxonomgrid_info = {\r
- "SPCAxonomGrid",\r
- sizeof (SPCAxonomGrid),\r
- sizeof (SPCAxonomGridClass),\r
- (GtkClassInitFunc) sp_caxonomgrid_class_init,\r
- (GtkObjectInitFunc) sp_caxonomgrid_init,\r
- NULL, NULL,\r
- (GtkClassInitFunc) NULL\r
- };\r
- caxonomgrid_type = gtk_type_unique (sp_canvas_item_get_type (), &caxonomgrid_info);\r
- }\r
- return caxonomgrid_type;\r
-}\r
-\r
-static void\r
-sp_caxonomgrid_class_init (SPCAxonomGridClass *klass)\r
-{\r
-\r
- GtkObjectClass *object_class;\r
- SPCanvasItemClass *item_class;\r
-\r
- object_class = (GtkObjectClass *) klass;\r
- item_class = (SPCanvasItemClass *) klass;\r
-\r
- parent_class = (SPCanvasItemClass*)gtk_type_class (sp_canvas_item_get_type ());\r
-\r
- gtk_object_add_arg_type ("SPCAxonomGrid::originx", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ORIGINX);\r
- gtk_object_add_arg_type ("SPCAxonomGrid::originy", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ORIGINY);\r
- gtk_object_add_arg_type ("SPCAxonomGrid::anglex", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ANGLEX);\r
- gtk_object_add_arg_type ("SPCAxonomGrid::spacingy", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_SPACINGY);\r
- gtk_object_add_arg_type ("SPCAxonomGrid::anglez", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ANGLEZ);\r
- gtk_object_add_arg_type ("SPCAxonomGrid::color", GTK_TYPE_INT, GTK_ARG_WRITABLE, ARG_COLOR);\r
- gtk_object_add_arg_type ("SPCAxonomGrid::empcolor", GTK_TYPE_INT, GTK_ARG_WRITABLE, ARG_EMPCOLOR);\r
- gtk_object_add_arg_type ("SPCAxonomGrid::empspacing", GTK_TYPE_INT, GTK_ARG_WRITABLE, ARG_EMPSPACING);\r
-\r
- object_class->destroy = sp_caxonomgrid_destroy;\r
- object_class->set_arg = sp_caxonomgrid_set_arg;\r
-\r
- item_class->update = sp_caxonomgrid_update;\r
- item_class->render = sp_caxonomgrid_render;\r
- \r
-}\r
-\r
-static void\r
-sp_caxonomgrid_init (SPCAxonomGrid *grid)\r
-{\r
- grid->origin[NR::X] = grid->origin[NR::Y] = 0.0;\r
-// grid->spacing[X] = grid->spacing[Y] = grid->spacing[Z] = 8.0;\r
- grid->color = 0x0000ff7f;\r
- grid->empcolor = 0x3F3FFF40;\r
- grid->empspacing = 5;\r
-}\r
-\r
-static void\r
-sp_caxonomgrid_destroy (GtkObject *object)\r
-{\r
- g_return_if_fail (object != NULL);\r
- g_return_if_fail (SP_IS_CAXONOMGRID (object));\r
-\r
- if (GTK_OBJECT_CLASS (parent_class)->destroy)\r
- (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);\r
-}\r
-\r
-static void\r
-sp_caxonomgrid_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)\r
-{\r
- SPCanvasItem *item = SP_CANVAS_ITEM (object);\r
- SPCAxonomGrid *grid = SP_CAXONOMGRID (object);\r
- \r
- switch (arg_id) {\r
- case ARG_ORIGINX:\r
- grid->origin[NR::X] = GTK_VALUE_DOUBLE (* arg);\r
- sp_canvas_item_request_update (item);\r
- break;\r
- case ARG_ORIGINY:\r
- grid->origin[NR::Y] = GTK_VALUE_DOUBLE (* arg);\r
- sp_canvas_item_request_update (item);\r
- break;\r
- case ARG_ANGLEX:\r
- grid->angle_deg[X] = GTK_VALUE_DOUBLE (* arg);\r
- if (grid->angle_deg[X] < 0.0) grid->angle_deg[X] = 0.0;\r
- if (grid->angle_deg[X] > 89.0) grid->angle_deg[X] = 89.0;\r
- grid->angle_rad[X] = deg_to_rad(grid->angle_deg[X]);\r
- grid->tan_angle[X] = tan(grid->angle_rad[X]);\r
- sp_canvas_item_request_update (item);\r
- break;\r
- case ARG_SPACINGY:\r
- grid->lengthy = GTK_VALUE_DOUBLE (* arg);\r
- if (grid->lengthy < 0.01) grid->lengthy = 0.01;\r
- sp_canvas_item_request_update (item);\r
- break;\r
- case ARG_ANGLEZ:\r
- grid->angle_deg[Z] = GTK_VALUE_DOUBLE (* arg);\r
- if (grid->angle_deg[Z] < 0.0) grid->angle_deg[Z] = 0.0;\r
- if (grid->angle_deg[X] > 89.0) grid->angle_deg[X] = 89.0;\r
- grid->angle_rad[Z] = deg_to_rad(grid->angle_deg[Z]);\r
- grid->tan_angle[Z] = tan(grid->angle_rad[Z]);\r
- sp_canvas_item_request_update (item);\r
- break;\r
- case ARG_COLOR:\r
- grid->color = GTK_VALUE_INT (* arg);\r
- sp_canvas_item_request_update (item);\r
- break;\r
- case ARG_EMPCOLOR:\r
- grid->empcolor = GTK_VALUE_INT (* arg);\r
- sp_canvas_item_request_update (item);\r
- break;\r
- case ARG_EMPSPACING:\r
- grid->empspacing = GTK_VALUE_INT (* arg);\r
- // std::cout << "Emphasis Spacing: " << grid->empspacing << std::endl;\r
- sp_canvas_item_request_update (item);\r
- break;\r
- default:\r
- break;\r
- }\r
-}\r
-\r
-\r
-\r
-/**\r
- \brief This function renders a pixel on a particular buffer.\r
- \r
- The topleft of the buffer equals\r
- ( rect.x0 , rect.y0 ) in screen coordinates\r
- ( 0 , 0 ) in setpixel coordinates\r
- The bottomright of the buffer equals\r
- ( rect.x1 , rect,y1 ) in screen coordinates\r
- ( rect.x1 - rect.x0 , rect.y1 - rect.y0 ) in setpixel coordinates\r
-*/\r
-static void \r
-sp_caxonomgrid_setpixel (SPCanvasBuf *buf, gint x, gint y, guint32 rgba) {\r
-#ifdef SAFE_SETPIXEL\r
- if ( (x >= buf->rect.x0) && (x < buf->rect.x1) && (y >= buf->rect.y0) && (y < buf->rect.y1) ) {\r
-#endif \r
- guint r, g, b, a; \r
- r = NR_RGBA32_R (rgba);\r
- g = NR_RGBA32_G (rgba);\r
- b = NR_RGBA32_B (rgba);\r
- a = NR_RGBA32_A (rgba); \r
- guchar * p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;\r
- p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);\r
- p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);\r
- p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);\r
-#ifdef SAFE_SETPIXEL\r
- }\r
-#endif \r
-}\r
-\r
-/**\r
- \brief This function renders a line on a particular canvas buffer,\r
- using Bresenham's line drawing function.\r
- http://www.cs.unc.edu/~mcmillan/comp136/Lecture6/Lines.html \r
- Coordinates are interpreted as SCREENcoordinates\r
-*/\r
-static void \r
-sp_caxonomgrid_drawline (SPCanvasBuf *buf, gint x0, gint y0, gint x1, gint y1, guint32 rgba) {\r
- int dy = y1 - y0;\r
- int dx = x1 - x0;\r
- int stepx, stepy;\r
-\r
- if (dy < 0) { dy = -dy; stepy = -1; } else { stepy = 1; }\r
- if (dx < 0) { dx = -dx; stepx = -1; } else { stepx = 1; }\r
- dy <<= 1; // dy is now 2*dy\r
- dx <<= 1; // dx is now 2*dx\r
-\r
- sp_caxonomgrid_setpixel(buf, x0, y0, rgba);\r
- if (dx > dy) {\r
- int fraction = dy - (dx >> 1); // same as 2*dy - dx\r
- while (x0 != x1) {\r
- if (fraction >= 0) {\r
- y0 += stepy;\r
- fraction -= dx; // same as fraction -= 2*dx\r
- }\r
- x0 += stepx;\r
- fraction += dy; // same as fraction -= 2*dy\r
- sp_caxonomgrid_setpixel(buf, x0, y0, rgba);\r
- }\r
- } else {\r
- int fraction = dx - (dy >> 1);\r
- while (y0 != y1) {\r
- if (fraction >= 0) {\r
- x0 += stepx;\r
- fraction -= dy;\r
- }\r
- y0 += stepy;\r
- fraction += dx;\r
- sp_caxonomgrid_setpixel(buf, x0, y0, rgba);\r
- }\r
- }\r
- \r
-}\r
-\r
-static void\r
-sp_grid_vline (SPCanvasBuf *buf, gint x, gint ys, gint ye, guint32 rgba)\r
-{\r
- if ((x >= buf->rect.x0) && (x < buf->rect.x1)) {\r
- guint r, g, b, a;\r
- gint y0, y1, y;\r
- guchar *p;\r
- r = NR_RGBA32_R(rgba);\r
- g = NR_RGBA32_G (rgba);\r
- b = NR_RGBA32_B (rgba);\r
- a = NR_RGBA32_A (rgba);\r
- y0 = MAX (buf->rect.y0, ys);\r
- y1 = MIN (buf->rect.y1, ye + 1);\r
- p = buf->buf + (y0 - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;\r
- for (y = y0; y < y1; y++) {\r
- p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);\r
- p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);\r
- p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);\r
- p += buf->buf_rowstride;\r
- }\r
- }\r
-}\r
-\r
-/**\r
- \brief This function renders the grid on a particular canvas buffer\r
- \param item The grid to render on the buffer\r
- \param buf The buffer to render the grid on\r
- \r
- This function gets called a touch more than you might believe,\r
- about once per tile. This means that it could probably be optimized\r
- and help things out.\r
-\r
- Basically this function has to determine where in the canvas it is,\r
- and how that associates with the grid. It does this first by looking\r
- at the bounding box of the buffer, and then calculates where the grid\r
- starts in that buffer. It will then step through grid lines until\r
- it is outside of the buffer.\r
-\r
- For each grid line it is drawn using the function \c sp_grid_hline\r
- or \c sp_grid_vline. These are convience functions for the sake\r
- of making the function easier to read.\r
-\r
- Also, there are emphasized lines on the grid. While the \c syg and\r
- \c sxg variable track grid positioning, the \c xlinestart and \c\r
- ylinestart variables track the 'count' of what lines they are. If\r
- that count is a multiple of the line seperation between emphasis\r
- lines, then that line is drawn in the emphasis color.\r
-*/\r
-static void\r
-sp_caxonomgrid_render (SPCanvasItem * item, SPCanvasBuf * buf)\r
-{\r
- SPCAxonomGrid *grid = SP_CAXONOMGRID (item);\r
-\r
- sp_canvas_prepare_buffer (buf);\r
- \r
- // gc = gridcoordinates (the coordinates calculated from the grids origin 'grid->ow'.\r
- // sc = screencoordinates ( for example "buf->rect.x0" is in screencoordinates )\r
- // bc = buffer patch coordinates \r
- \r
- // tl = topleft ; br = bottomright\r
- NR::Point buf_tl_gc;\r
- NR::Point buf_br_gc;\r
- buf_tl_gc[NR::X] = buf->rect.x0 - grid->ow[NR::X];\r
- buf_tl_gc[NR::Y] = buf->rect.y0 - grid->ow[NR::Y];\r
- buf_br_gc[NR::X] = buf->rect.x1 - grid->ow[NR::X];\r
- buf_br_gc[NR::Y] = buf->rect.y1 - grid->ow[NR::Y];\r
-\r
-\r
- gdouble x;\r
- gdouble y;\r
-\r
- // render the three separate line groups representing the main-axes:\r
- // x-axis always goes from topleft to bottomright. (0,0) - (1,1) \r
- const gdouble xintercept_y_bc = (buf_tl_gc[NR::X] * grid->tan_angle[X]) - buf_tl_gc[NR::Y] ;\r
- const gdouble xstart_y_sc = ( xintercept_y_bc - floor(xintercept_y_bc/grid->lyw)*grid->lyw ) + buf->rect.y0;\r
- const gint xlinestart = (gint) Inkscape::round( (xstart_y_sc - grid->ow[NR::Y]) / grid->lyw );\r
- gint xlinenum;\r
- // lijnen vanaf linker zijkant.\r
- for (y = xstart_y_sc, xlinenum = xlinestart; y < buf->rect.y1; y += grid->lyw, xlinenum++) {\r
- const gint x0 = buf->rect.x0;\r
- const gint y0 = (gint) Inkscape::round(y);\r
- const gint x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - y) / grid->tan_angle[X] );\r
- const gint y1 = buf->rect.y1;\r
- \r
- if (!grid->scaled && (xlinenum % grid->empspacing) == 0) {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);\r
- } else {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);\r
- }\r
- }\r
- // lijnen vanaf bovenkant.\r
- const gdouble xstart_x_sc = buf->rect.x0 + (grid->lxw_x - (xstart_y_sc - buf->rect.y0) / grid->tan_angle[X]) ;\r
- for (x = xstart_x_sc, xlinenum = xlinestart; x < buf->rect.x1; x += grid->lxw_x, xlinenum--) {\r
- const gint y0 = buf->rect.y0;\r
- const gint y1 = buf->rect.y1;\r
- const gint x0 = (gint) Inkscape::round(x);\r
- const gint x1 = x0 + (gint) Inkscape::round( (y1 - y0) / grid->tan_angle[X] );\r
- \r
- if (!grid->scaled && (xlinenum % grid->empspacing) == 0) {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);\r
- } else {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);\r
- }\r
- }\r
- \r
-\r
- // y-axis lines (vertical)\r
- const gdouble ystart_x_sc = floor (buf_tl_gc[NR::X] / grid->spacing_ylines) * grid->spacing_ylines + grid->ow[NR::X];\r
- const gint ylinestart = (gint) Inkscape::round((ystart_x_sc - grid->ow[NR::X]) / grid->spacing_ylines);\r
- gint ylinenum;\r
- for (x = ystart_x_sc, ylinenum = ylinestart; x < buf->rect.x1; x += grid->spacing_ylines, ylinenum++) {\r
- const gint x0 = (gint) Inkscape::round(x);\r
-\r
- if (!grid->scaled && (ylinenum % grid->empspacing) == 0) {\r
- sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, grid->empcolor);\r
- } else {\r
- sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, grid->color);\r
- }\r
- }\r
-\r
- // z-axis always goes from bottomleft to topright. (0,1) - (1,0) \r
- const gdouble zintercept_y_bc = (buf_tl_gc[NR::X] * -grid->tan_angle[Z]) - buf_tl_gc[NR::Y] ;\r
- const gdouble zstart_y_sc = ( zintercept_y_bc - floor(zintercept_y_bc/grid->lyw)*grid->lyw ) + buf->rect.y0;\r
- const gint zlinestart = (gint) Inkscape::round( (zstart_y_sc - grid->ow[NR::Y]) / grid->lyw );\r
- gint zlinenum;\r
- // lijnen vanaf linker zijkant.\r
- for (y = zstart_y_sc, zlinenum = zlinestart; y < buf->rect.y1; y += grid->lyw, zlinenum++) {\r
- const gint x0 = buf->rect.x0;\r
- const gint y0 = (gint) Inkscape::round(y);\r
- const gint x1 = x0 + (gint) Inkscape::round( (y - buf->rect.y0 ) / grid->tan_angle[Z] );\r
- const gint y1 = buf->rect.y0;\r
- \r
- if (!grid->scaled && (zlinenum % grid->empspacing) == 0) {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);\r
- } else {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);\r
- }\r
- }\r
- // lijnen vanaf onderkant.\r
- const gdouble zstart_x_sc = buf->rect.x0 + (y - buf->rect.y1) / grid->tan_angle[Z] ;\r
- for (x = zstart_x_sc; x < buf->rect.x1; x += grid->lxw_z, zlinenum--) {\r
- const gint y0 = buf->rect.y1;\r
- const gint y1 = buf->rect.y0;\r
- const gint x0 = (gint) Inkscape::round(x);\r
- const gint x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - buf->rect.y0) / grid->tan_angle[Z] );\r
- \r
- if (!grid->scaled && (zlinenum % grid->empspacing) == 0) {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);\r
- } else {\r
- sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);\r
- }\r
- }\r
- \r
-}\r
-\r
-static void\r
-sp_caxonomgrid_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags)\r
-{\r
- SPCAxonomGrid *grid = SP_CAXONOMGRID (item);\r
-\r
- if (parent_class->update)\r
- (* parent_class->update) (item, affine, flags);\r
-\r
- grid->ow = grid->origin * affine;\r
- grid->sw = NR::Point(fabs(affine[0]),fabs(affine[3]));\r
- \r
- for(int dim = 0; dim < 2; dim++) {\r
- gint scaling_factor = grid->empspacing;\r
-\r
- if (scaling_factor <= 1)\r
- scaling_factor = 5;\r
-\r
- grid->scaled = FALSE;\r
- while (grid->sw[dim] < 8.0) {\r
- grid->scaled = TRUE;\r
- grid->sw[dim] *= scaling_factor;\r
- // First pass, go up to the major line spacing, then\r
- // keep increasing by two.\r
- scaling_factor = 2;\r
- }\r
- }\r
-\r
- grid->spacing_ylines = grid->sw[NR::X] * grid->lengthy /(grid->tan_angle[X] + grid->tan_angle[Z]);\r
- grid->lyw = grid->lengthy * grid->sw[NR::Y];\r
- grid->lxw_x = (grid->lengthy / grid->tan_angle[X]) * grid->sw[NR::X];\r
- grid->lxw_z = (grid->lengthy / grid->tan_angle[Z]) * grid->sw[NR::X];\r
-\r
- if (grid->empspacing == 0) {\r
- grid->scaled = TRUE;\r
- }\r
-\r
- sp_canvas_request_redraw (item->canvas,\r
- -1000000, -1000000,\r
- 1000000, 1000000);\r
- \r
- item->x1 = item->y1 = -1000000;\r
- item->x2 = item->y2 = 1000000;\r
-}\r
-\r
-/*\r
- Local Variables:\r
- mode:c++\r
- c-file-style:"stroustrup"\r
- c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))\r
- indent-tabs-mode:nil\r
- fill-column:99\r
- End:\r
-*/\r
-// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :\r
+#define SP_CANVAS_AXONOMGRID_C
+
+/*
+ * SPCAxonomGrid
+ *
+ * Copyright (C) 2006 Johan Engelen <johan@shouraizou.nl>
+ * Copyright (C) 2000 Lauris Kaplinski
+ *
+ */
+
+ /*
+ * Current limits are: one axis (y-axis) is always vertical. The other two
+ * axes are bound to a certain range of angles. The z-axis always has an angle
+ * smaller than 90 degrees (measured from horizontal, 0 degrees being a line extending
+ * to the right). The x-axis will always have an angle between 0 and 90 degrees.
+ * When I quickly think about it: all possibilities are probably covered this way. Eg.
+ * a z-axis with negative angle can be replaced with an x-axis, etc.
+ */
+
+ /*
+ * TODO: LOTS LOTS LOTS. Optimization etc.
+ *
+ */
+
+#include "sp-canvas-util.h"
+#include "canvas-axonomgrid.h"
+#include "display-forward.h"
+#include <libnr/nr-pixops.h>
+
+#define SAFE_SETPIXEL //undefine this when it is certain that setpixel is never called with invalid params
+
+enum {
+ ARG_0,
+ ARG_ORIGINX,
+ ARG_ORIGINY,
+ ARG_ANGLEX,
+ ARG_SPACINGY,
+ ARG_ANGLEZ,
+ ARG_COLOR,
+ ARG_EMPCOLOR,
+ ARG_EMPSPACING
+};
+
+enum Dim3 { X=0, Y, Z };
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+static double deg_to_rad(double deg) { return deg*M_PI/180.0;}
+
+
+static void sp_caxonomgrid_class_init (SPCAxonomGridClass *klass);
+static void sp_caxonomgrid_init (SPCAxonomGrid *grid);
+static void sp_caxonomgrid_destroy (GtkObject *object);
+static void sp_caxonomgrid_set_arg (GtkObject *object, GtkArg *arg, guint arg_id);
+
+static void sp_caxonomgrid_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags);
+static void sp_caxonomgrid_render (SPCanvasItem *item, SPCanvasBuf *buf);
+
+static SPCanvasItemClass * parent_class;
+
+GtkType
+sp_caxonomgrid_get_type (void)
+{
+ static GtkType caxonomgrid_type = 0;
+
+ if (!caxonomgrid_type) {
+ GtkTypeInfo caxonomgrid_info = {
+ "SPCAxonomGrid",
+ sizeof (SPCAxonomGrid),
+ sizeof (SPCAxonomGridClass),
+ (GtkClassInitFunc) sp_caxonomgrid_class_init,
+ (GtkObjectInitFunc) sp_caxonomgrid_init,
+ NULL, NULL,
+ (GtkClassInitFunc) NULL
+ };
+ caxonomgrid_type = gtk_type_unique (sp_canvas_item_get_type (), &caxonomgrid_info);
+ }
+ return caxonomgrid_type;
+}
+
+static void
+sp_caxonomgrid_class_init (SPCAxonomGridClass *klass)
+{
+
+ GtkObjectClass *object_class;
+ SPCanvasItemClass *item_class;
+
+ object_class = (GtkObjectClass *) klass;
+ item_class = (SPCanvasItemClass *) klass;
+
+ parent_class = (SPCanvasItemClass*)gtk_type_class (sp_canvas_item_get_type ());
+
+ gtk_object_add_arg_type ("SPCAxonomGrid::originx", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ORIGINX);
+ gtk_object_add_arg_type ("SPCAxonomGrid::originy", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ORIGINY);
+ gtk_object_add_arg_type ("SPCAxonomGrid::anglex", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ANGLEX);
+ gtk_object_add_arg_type ("SPCAxonomGrid::spacingy", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_SPACINGY);
+ gtk_object_add_arg_type ("SPCAxonomGrid::anglez", GTK_TYPE_DOUBLE, GTK_ARG_WRITABLE, ARG_ANGLEZ);
+ gtk_object_add_arg_type ("SPCAxonomGrid::color", GTK_TYPE_INT, GTK_ARG_WRITABLE, ARG_COLOR);
+ gtk_object_add_arg_type ("SPCAxonomGrid::empcolor", GTK_TYPE_INT, GTK_ARG_WRITABLE, ARG_EMPCOLOR);
+ gtk_object_add_arg_type ("SPCAxonomGrid::empspacing", GTK_TYPE_INT, GTK_ARG_WRITABLE, ARG_EMPSPACING);
+
+ object_class->destroy = sp_caxonomgrid_destroy;
+ object_class->set_arg = sp_caxonomgrid_set_arg;
+
+ item_class->update = sp_caxonomgrid_update;
+ item_class->render = sp_caxonomgrid_render;
+
+}
+
+static void
+sp_caxonomgrid_init (SPCAxonomGrid *grid)
+{
+ grid->origin[NR::X] = grid->origin[NR::Y] = 0.0;
+// grid->spacing[X] = grid->spacing[Y] = grid->spacing[Z] = 8.0;
+ grid->color = 0x0000ff7f;
+ grid->empcolor = 0x3F3FFF40;
+ grid->empspacing = 5;
+}
+
+static void
+sp_caxonomgrid_destroy (GtkObject *object)
+{
+ g_return_if_fail (object != NULL);
+ g_return_if_fail (SP_IS_CAXONOMGRID (object));
+
+ if (GTK_OBJECT_CLASS (parent_class)->destroy)
+ (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
+}
+
+static void
+sp_caxonomgrid_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
+{
+ SPCanvasItem *item = SP_CANVAS_ITEM (object);
+ SPCAxonomGrid *grid = SP_CAXONOMGRID (object);
+
+ switch (arg_id) {
+ case ARG_ORIGINX:
+ grid->origin[NR::X] = GTK_VALUE_DOUBLE (* arg);
+ sp_canvas_item_request_update (item);
+ break;
+ case ARG_ORIGINY:
+ grid->origin[NR::Y] = GTK_VALUE_DOUBLE (* arg);
+ sp_canvas_item_request_update (item);
+ break;
+ case ARG_ANGLEX:
+ grid->angle_deg[X] = GTK_VALUE_DOUBLE (* arg);
+ if (grid->angle_deg[X] < 0.0) grid->angle_deg[X] = 0.0;
+ if (grid->angle_deg[X] > 89.0) grid->angle_deg[X] = 89.0;
+ grid->angle_rad[X] = deg_to_rad(grid->angle_deg[X]);
+ grid->tan_angle[X] = tan(grid->angle_rad[X]);
+ sp_canvas_item_request_update (item);
+ break;
+ case ARG_SPACINGY:
+ grid->lengthy = GTK_VALUE_DOUBLE (* arg);
+ if (grid->lengthy < 0.01) grid->lengthy = 0.01;
+ sp_canvas_item_request_update (item);
+ break;
+ case ARG_ANGLEZ:
+ grid->angle_deg[Z] = GTK_VALUE_DOUBLE (* arg);
+ if (grid->angle_deg[Z] < 0.0) grid->angle_deg[Z] = 0.0;
+ if (grid->angle_deg[X] > 89.0) grid->angle_deg[X] = 89.0;
+ grid->angle_rad[Z] = deg_to_rad(grid->angle_deg[Z]);
+ grid->tan_angle[Z] = tan(grid->angle_rad[Z]);
+ sp_canvas_item_request_update (item);
+ break;
+ case ARG_COLOR:
+ grid->color = GTK_VALUE_INT (* arg);
+ sp_canvas_item_request_update (item);
+ break;
+ case ARG_EMPCOLOR:
+ grid->empcolor = GTK_VALUE_INT (* arg);
+ sp_canvas_item_request_update (item);
+ break;
+ case ARG_EMPSPACING:
+ grid->empspacing = GTK_VALUE_INT (* arg);
+ // std::cout << "Emphasis Spacing: " << grid->empspacing << std::endl;
+ sp_canvas_item_request_update (item);
+ break;
+ default:
+ break;
+ }
+}
+
+
+
+/**
+ \brief This function renders a pixel on a particular buffer.
+
+ The topleft of the buffer equals
+ ( rect.x0 , rect.y0 ) in screen coordinates
+ ( 0 , 0 ) in setpixel coordinates
+ The bottomright of the buffer equals
+ ( rect.x1 , rect,y1 ) in screen coordinates
+ ( rect.x1 - rect.x0 , rect.y1 - rect.y0 ) in setpixel coordinates
+*/
+static void
+sp_caxonomgrid_setpixel (SPCanvasBuf *buf, gint x, gint y, guint32 rgba) {
+#ifdef SAFE_SETPIXEL
+ if ( (x >= buf->rect.x0) && (x < buf->rect.x1) && (y >= buf->rect.y0) && (y < buf->rect.y1) ) {
+#endif
+ guint r, g, b, a;
+ r = NR_RGBA32_R (rgba);
+ g = NR_RGBA32_G (rgba);
+ b = NR_RGBA32_B (rgba);
+ a = NR_RGBA32_A (rgba);
+ guchar * p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
+ p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
+ p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
+ p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
+#ifdef SAFE_SETPIXEL
+ }
+#endif
+}
+
+/**
+ \brief This function renders a line on a particular canvas buffer,
+ using Bresenham's line drawing function.
+ http://www.cs.unc.edu/~mcmillan/comp136/Lecture6/Lines.html
+ Coordinates are interpreted as SCREENcoordinates
+*/
+static void
+sp_caxonomgrid_drawline (SPCanvasBuf *buf, gint x0, gint y0, gint x1, gint y1, guint32 rgba) {
+ int dy = y1 - y0;
+ int dx = x1 - x0;
+ int stepx, stepy;
+
+ if (dy < 0) { dy = -dy; stepy = -1; } else { stepy = 1; }
+ if (dx < 0) { dx = -dx; stepx = -1; } else { stepx = 1; }
+ dy <<= 1; // dy is now 2*dy
+ dx <<= 1; // dx is now 2*dx
+
+ sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
+ if (dx > dy) {
+ int fraction = dy - (dx >> 1); // same as 2*dy - dx
+ while (x0 != x1) {
+ if (fraction >= 0) {
+ y0 += stepy;
+ fraction -= dx; // same as fraction -= 2*dx
+ }
+ x0 += stepx;
+ fraction += dy; // same as fraction -= 2*dy
+ sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
+ }
+ } else {
+ int fraction = dx - (dy >> 1);
+ while (y0 != y1) {
+ if (fraction >= 0) {
+ x0 += stepx;
+ fraction -= dy;
+ }
+ y0 += stepy;
+ fraction += dx;
+ sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
+ }
+ }
+
+}
+
+static void
+sp_grid_vline (SPCanvasBuf *buf, gint x, gint ys, gint ye, guint32 rgba)
+{
+ if ((x >= buf->rect.x0) && (x < buf->rect.x1)) {
+ guint r, g, b, a;
+ gint y0, y1, y;
+ guchar *p;
+ r = NR_RGBA32_R(rgba);
+ g = NR_RGBA32_G (rgba);
+ b = NR_RGBA32_B (rgba);
+ a = NR_RGBA32_A (rgba);
+ y0 = MAX (buf->rect.y0, ys);
+ y1 = MIN (buf->rect.y1, ye + 1);
+ p = buf->buf + (y0 - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
+ for (y = y0; y < y1; y++) {
+ p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
+ p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
+ p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
+ p += buf->buf_rowstride;
+ }
+ }
+}
+
+/**
+ \brief This function renders the grid on a particular canvas buffer
+ \param item The grid to render on the buffer
+ \param buf The buffer to render the grid on
+
+ This function gets called a touch more than you might believe,
+ about once per tile. This means that it could probably be optimized
+ and help things out.
+
+ Basically this function has to determine where in the canvas it is,
+ and how that associates with the grid. It does this first by looking
+ at the bounding box of the buffer, and then calculates where the grid
+ starts in that buffer. It will then step through grid lines until
+ it is outside of the buffer.
+
+ For each grid line it is drawn using the function \c sp_grid_hline
+ or \c sp_grid_vline. These are convience functions for the sake
+ of making the function easier to read.
+
+ Also, there are emphasized lines on the grid. While the \c syg and
+ \c sxg variable track grid positioning, the \c xlinestart and \c
+ ylinestart variables track the 'count' of what lines they are. If
+ that count is a multiple of the line seperation between emphasis
+ lines, then that line is drawn in the emphasis color.
+*/
+static void
+sp_caxonomgrid_render (SPCanvasItem * item, SPCanvasBuf * buf)
+{
+ SPCAxonomGrid *grid = SP_CAXONOMGRID (item);
+
+ sp_canvas_prepare_buffer (buf);
+
+ // gc = gridcoordinates (the coordinates calculated from the grids origin 'grid->ow'.
+ // sc = screencoordinates ( for example "buf->rect.x0" is in screencoordinates )
+ // bc = buffer patch coordinates
+
+ // tl = topleft ; br = bottomright
+ NR::Point buf_tl_gc;
+ NR::Point buf_br_gc;
+ buf_tl_gc[NR::X] = buf->rect.x0 - grid->ow[NR::X];
+ buf_tl_gc[NR::Y] = buf->rect.y0 - grid->ow[NR::Y];
+ buf_br_gc[NR::X] = buf->rect.x1 - grid->ow[NR::X];
+ buf_br_gc[NR::Y] = buf->rect.y1 - grid->ow[NR::Y];
+
+
+ gdouble x;
+ gdouble y;
+
+ // render the three separate line groups representing the main-axes:
+ // x-axis always goes from topleft to bottomright. (0,0) - (1,1)
+ const gdouble xintercept_y_bc = (buf_tl_gc[NR::X] * grid->tan_angle[X]) - buf_tl_gc[NR::Y] ;
+ const gdouble xstart_y_sc = ( xintercept_y_bc - floor(xintercept_y_bc/grid->lyw)*grid->lyw ) + buf->rect.y0;
+ const gint xlinestart = (gint) Inkscape::round( (xstart_y_sc - grid->ow[NR::Y]) / grid->lyw );
+ gint xlinenum;
+ // lijnen vanaf linker zijkant.
+ for (y = xstart_y_sc, xlinenum = xlinestart; y < buf->rect.y1; y += grid->lyw, xlinenum++) {
+ const gint x0 = buf->rect.x0;
+ const gint y0 = (gint) Inkscape::round(y);
+ const gint x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - y) / grid->tan_angle[X] );
+ const gint y1 = buf->rect.y1;
+
+ if (!grid->scaled && (xlinenum % grid->empspacing) == 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);
+ }
+ }
+ // lijnen vanaf bovenkant.
+ const gdouble xstart_x_sc = buf->rect.x0 + (grid->lxw_x - (xstart_y_sc - buf->rect.y0) / grid->tan_angle[X]) ;
+ for (x = xstart_x_sc, xlinenum = xlinestart; x < buf->rect.x1; x += grid->lxw_x, xlinenum--) {
+ const gint y0 = buf->rect.y0;
+ const gint y1 = buf->rect.y1;
+ const gint x0 = (gint) Inkscape::round(x);
+ const gint x1 = x0 + (gint) Inkscape::round( (y1 - y0) / grid->tan_angle[X] );
+
+ if (!grid->scaled && (xlinenum % grid->empspacing) == 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);
+ }
+ }
+
+
+ // y-axis lines (vertical)
+ const gdouble ystart_x_sc = floor (buf_tl_gc[NR::X] / grid->spacing_ylines) * grid->spacing_ylines + grid->ow[NR::X];
+ const gint ylinestart = (gint) Inkscape::round((ystart_x_sc - grid->ow[NR::X]) / grid->spacing_ylines);
+ gint ylinenum;
+ for (x = ystart_x_sc, ylinenum = ylinestart; x < buf->rect.x1; x += grid->spacing_ylines, ylinenum++) {
+ const gint x0 = (gint) Inkscape::round(x);
+
+ if (!grid->scaled && (ylinenum % grid->empspacing) == 0) {
+ sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, grid->empcolor);
+ } else {
+ sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, grid->color);
+ }
+ }
+
+ // z-axis always goes from bottomleft to topright. (0,1) - (1,0)
+ const gdouble zintercept_y_bc = (buf_tl_gc[NR::X] * -grid->tan_angle[Z]) - buf_tl_gc[NR::Y] ;
+ const gdouble zstart_y_sc = ( zintercept_y_bc - floor(zintercept_y_bc/grid->lyw)*grid->lyw ) + buf->rect.y0;
+ const gint zlinestart = (gint) Inkscape::round( (zstart_y_sc - grid->ow[NR::Y]) / grid->lyw );
+ gint zlinenum;
+ // lijnen vanaf linker zijkant.
+ for (y = zstart_y_sc, zlinenum = zlinestart; y < buf->rect.y1; y += grid->lyw, zlinenum++) {
+ const gint x0 = buf->rect.x0;
+ const gint y0 = (gint) Inkscape::round(y);
+ const gint x1 = x0 + (gint) Inkscape::round( (y - buf->rect.y0 ) / grid->tan_angle[Z] );
+ const gint y1 = buf->rect.y0;
+
+ if (!grid->scaled && (zlinenum % grid->empspacing) == 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);
+ }
+ }
+ // lijnen vanaf onderkant.
+ const gdouble zstart_x_sc = buf->rect.x0 + (y - buf->rect.y1) / grid->tan_angle[Z] ;
+ for (x = zstart_x_sc; x < buf->rect.x1; x += grid->lxw_z, zlinenum--) {
+ const gint y0 = buf->rect.y1;
+ const gint y1 = buf->rect.y0;
+ const gint x0 = (gint) Inkscape::round(x);
+ const gint x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - buf->rect.y0) / grid->tan_angle[Z] );
+
+ if (!grid->scaled && (zlinenum % grid->empspacing) == 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->empcolor);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, grid->color);
+ }
+ }
+
+}
+
+static void
+sp_caxonomgrid_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags)
+{
+ SPCAxonomGrid *grid = SP_CAXONOMGRID (item);
+
+ if (parent_class->update)
+ (* parent_class->update) (item, affine, flags);
+
+ grid->ow = grid->origin * affine;
+ grid->sw = NR::Point(fabs(affine[0]),fabs(affine[3]));
+
+ for(int dim = 0; dim < 2; dim++) {
+ gint scaling_factor = grid->empspacing;
+
+ if (scaling_factor <= 1)
+ scaling_factor = 5;
+
+ grid->scaled = FALSE;
+ while (grid->sw[dim] < 8.0) {
+ grid->scaled = TRUE;
+ grid->sw[dim] *= scaling_factor;
+ // First pass, go up to the major line spacing, then
+ // keep increasing by two.
+ scaling_factor = 2;
+ }
+ }
+
+ grid->spacing_ylines = grid->sw[NR::X] * grid->lengthy /(grid->tan_angle[X] + grid->tan_angle[Z]);
+ grid->lyw = grid->lengthy * grid->sw[NR::Y];
+ grid->lxw_x = (grid->lengthy / grid->tan_angle[X]) * grid->sw[NR::X];
+ grid->lxw_z = (grid->lengthy / grid->tan_angle[Z]) * grid->sw[NR::X];
+
+ if (grid->empspacing == 0) {
+ grid->scaled = TRUE;
+ }
+
+ sp_canvas_request_redraw (item->canvas,
+ -1000000, -1000000,
+ 1000000, 1000000);
+
+ item->x1 = item->y1 = -1000000;
+ item->x2 = item->y2 = 1000000;
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :