/*--------------------------------------------------------------
Routine : draw_symbol
Purpose : Draws the symbol.
---------------------------------------------------------------*/
void
draw_symbol(Canvas canvas, CanvasCoord symbol_centre, SYMBOL *symbol)
{
SEGMENT *seg_list;
ARC *arc;
RECTANGLE *rect;
POLYLINE *poly;
LINE *line;
ASSERT( symbol != NULL );
seg_list = symbol->segment_list;
while (seg_list != NULL) {
/* Identify and draw the segment type */
switch (seg_list->type) {
case CLEAR_ARC_SEG :
arc = (ARC *)(seg_list->seg);
clear_arc(canvas, arc, symbol_centre);
break;
case FILL_ARC_SEG :
arc = (ARC *)(seg_list->seg);
fill_arc(canvas, arc, symbol_centre, symbol->type);
break;
case ARC_SEG :
arc = (ARC *)(seg_list->seg);
draw_arc(canvas, arc, symbol_centre);
break;
case RECTANGLE_SEG :
rect = (RECTANGLE *)(seg_list->seg);
draw_rectangle(canvas, rect, symbol_centre);
break;
case FILL_RECTANGLE_SEG :
rect = (RECTANGLE *)(seg_list->seg);
fill_rectangle(canvas, rect, symbol_centre, symbol->type);
break;
case FILL_POLYLINE_SEG :
poly = (POLYLINE *)(seg_list->seg);
fill_polyline(canvas, poly, symbol_centre, symbol->type);
break;
case POLYLINE_SEG :
poly = (POLYLINE *)(seg_list->seg);
draw_polyline(canvas, poly, symbol_centre);
break;
case LINE_SEG :
line = (LINE *)(seg_list->seg);
draw_line(canvas, line, symbol_centre);
break;
default:
printf("\n*** draw_symbol : Invalid segment type ***\n\n");
exit(1);
}
seg_list = seg_list->next;
}
}
void ArcballHelper::fill_half_arc(
Arcball const & arcball,
std::vector<glm::vec3> & positions,
glm::vec3 axis)
{
// create a perpendicular vector that is a "mirror" over another axis
glm::vec3 mirror_point;
if (axis.z != 1.0f) {
mirror_point.x = axis.y;
mirror_point.y = -axis.x;
mirror_point = glm::normalize(mirror_point);
} else {
mirror_point.x = 0.0f;
mirror_point.y = 1.0f;
}
auto mid_point = glm::cross(mirror_point, axis);
// "combine" the two half arcs into one arc
fill_arc(arcball, positions, mirror_point, mid_point);
fill_arc(arcball, positions, mid_point, -mirror_point);
}
void ArcballHelper::update_drag(Arcball const & arcball)
{
std::vector<glm::vec3> positions;
if (arcball.dragging) {
auto color = glm::vec3(1.0f, 1.0f, 0.0f);
// set appropiate drag arc color depending on the constraint axis
if (arcball.constraint.current != AxisSet::NONE) {
color = axis_index_color(arcball.constraint.nearest);
}
auto & material = drag_node->get_material();
material.get_uniform("diffuse") = color;
fill_arc(arcball, positions, arcball.drag.from, arcball.drag.to);
}
auto & mesh = drag_node->get_mesh();
mesh.set_positions(positions);
}
static void
fill_ellipse (DiaRenderer *object, Point *center,
real width, real height, Color *color)
{
fill_arc(object, center, width, height, 0.0, 360.0, color);
}
