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dimension.cpp
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/*
* dimension.cpp
*
* Dimension classes
* Copyright (C) 2002 lignum Computing, Inc. <[email protected]>
* $Id$
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "OGLFT.h"
#include "ratio.h"
#include "handle.h"
#include "dimension.h"
#include "openglview.h"
namespace Space2D {
Dimension::Dimension ( OpenGLBase* view )
: view_( view )
{
init();
}
Dimension::Dimension ( const Point& end0, const Point& end1, const Vector& normal,
OpenGLBase* view, const QString& note )
: end0_( end0 ), end1_( end1 ), normal_( normal ), view_( view ), note_( note )
{
init();
computeLayout();
}
void Dimension::init ( void )
{
extension_offset_ = 0.;
dimension_offset_ = 0.;
dimension_value_.placement = INTERIOR;
extension_lines_[END0].use_ = true;
extension_lines_[END1].use_ = true;
dimension_value_.face_data_.horizontal_justification_ = lC::CENTER;
dimension_value_.face_data_.vertical_justification_ = lC::MIDDLE;
}
void Dimension::setEndsNormal ( const Point& end0, const Point& end1,
const Vector& normal, OpenGLBase* view,
const QString& note )
{
end0_ = end0;
end1_ = end1;
normal_ = normal;
view_ = view;
note_ = note;
computeLayout();
}
void Dimension::setUseExtensionLine ( bool use_end0, bool use_end1 )
{
extension_lines_[END0].use_ = use_end0;
extension_lines_[END1].use_ = use_end1;
}
void Dimension::setDimensionAttributes ( double extension_offset,
double dimension_offset,
enum Placement placement )
{
extension_offset_ = extension_offset;
dimension_offset_ = dimension_offset;
dimension_value_.placement = placement;
computeLayout();
}
void Dimension::adjustExtension ( const Vector& delta )
{
extension_offset_ += ( delta * normal_ ) / view_->scale();
computeLayout();
}
void Dimension::adjustDimension ( const Vector& delta )
{
extension_offset_ += ( delta * normal_ ) / view_->scale();
Vector e = normal_;
e.rotate( -90 );
Vector dl = end1_ - end0_;
e = ( dl * e ) * e;
e.normalize();
// If the dimension text is INTERIOR, then its dimension offset is
// stored in scale inches. Otherwise, its offset is stored in
// paper inches. Why? As the view is rescaled, an INTERIOR
// dimension retains its relative position between the extension
// lines (e.g, it might be 25% of the way from END0 to END1). On
// the other hand, an EXTERIOR dimension text maintains the same
// paper distance from its END (e.g. it's always 1/4" from the
// END0 extension line).
switch ( dimension_value_.placement ) {
case INTERIOR:
dimension_offset_ += delta * e;
break;
case EXTERIOR_END0: case EXTERIOR_END1:
dimension_offset_ += ( delta * e ) / view_->scale();
}
computeLayout();
}
void Dimension::draw ( lC::Render::Mode mode ) const
{
QColor color = view_->constraintPrimaryColor();
if ( mode == lC::Render::HIGHLIGHTED || mode == lC::Render::ACTIVATED )
color = color.light();
// Avoid changing dimension state so this method remains "const".
FaceData face_data = dimension_value_.face_data_;
face_data.color_ = color.rgb();
view_->font(face_data)->draw( dimension_value_.position[X],
dimension_value_.position[Y],
dimension_value_.text );
glColor3ubv( lC::qCubv( color ) );
if ( locator_.use_ ) {
glBegin( GL_LINES );
glVertex2dv( locator_.from_ );
glVertex2dv( locator_.to_ );
glEnd();
}
arrow_.draw( arrows_[END1].from_, arrows_[END1].to_ );
if ( extension_lines_[END1].use_ ) {
glBegin( GL_LINES );
glVertex2dv( extension_lines_[END1].from_ );
glVertex2dv( extension_lines_[END1].to_ );
glEnd();
}
if ( mode == lC::Render::HIGHLIGHTED || mode == lC::Render::ACTIVATED ) {
color = view_->constraintSecondaryColor().light();
glColor3ubv( lC::qCubv( color ) );
}
if ( extension_lines_[END0].use_ ) {
glBegin( GL_LINES );
glVertex2dv( extension_lines_[END0].from_ );
glVertex2dv( extension_lines_[END0].to_ );
glEnd();
}
arrow_.draw( arrows_[END0].from_, arrows_[END0].to_ );
if ( mode == lC::Render::HIGHLIGHTED || mode == lC::Render::ACTIVATED ) {
ResizeHandle::draw( view_, mode, arrows_[END0].to_ );
ResizeHandle::draw( view_, mode, arrows_[END1].to_ );
}
}
void Dimension::select ( lC::Render::Mode mode ) const
{
glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
glPushMatrix();
glTranslated( dimension_value_.position[X], dimension_value_.position[Y], 0 );
glRotated( dimension_value_.face_data_.orientation_, 0, 0, 1 );
glPushName( 1 );
glRectdv( -0.5 * dimension_value_.bbox, 0.5 * dimension_value_.bbox );
glPopName();
glPopMatrix();
arrow_.select( arrows_[END0].from_, arrows_[END0].to_ );
arrow_.select( arrows_[END1].from_, arrows_[END1].to_ );
glBegin( GL_LINES );
if ( extension_lines_[END0].use_ ) {
glVertex2dv( extension_lines_[END0].from_ );
glVertex2dv( extension_lines_[END0].to_ );
}
if ( extension_lines_[END1].use_ ) {
glVertex2dv( extension_lines_[END1].from_ );
glVertex2dv( extension_lines_[END1].to_ );
}
if ( locator_.use_ ) {
glVertex2dv( locator_.from_ );
glVertex2dv( locator_.to_ );
}
glEnd();
if ( mode == lC::Render::ACTIVATED ) {
ResizeHandle::select( view_, arrows_[END0].to_ );
ResizeHandle::select( view_, arrows_[END1].to_ );
}
}
void Dimension::computeLayout ( void )
{
// This confuses even me. In the design documentation, there are
// some notes about the vector computations involved here.
// The delta vector; obviously, the vector from the first end to
// the second end
Vector dl = end1_ - end0_;
// e is the unit vector in the direction of the dimension line,
// i.e. it is perpendicular to the extension line direction.
Vector e = normal_;
e.rotate( -90 );
// The displayed value of the dimension is the projection of the
// delta vector onto e.
dimension_value_.value = fabs( dl * e );
// If e is not parallel to dl, then there will be a difference in
// the length of the extension lines. That difference is just
// equal to the projection of the delta vector onto the extension
// line direction.
double extra = dl * normal_;
double d0 = 0., d1 = 0.;
// The sign of the extra length determines whether it applies to
// the first or second end. Ultimately, the extension line lengths
// are positive.
if ( extra > 0 )
d0 = extra;
else
d1 = -extra;
// Convert the delta vector into the dimension line vector. This
// computation, (dl*e)*e, basically picks the component of the
// delta vector in the direction of e but it also corrects the
// sign of e which the rotate(-90) above might have miscomputed.
dl = ( dl * e ) * e;
if ( dimension_value_.value != 0 ) {
e = dl;
e.normalize();
}
// Compute the metrics of the dimension string. Start by asking the
// LengthUnit basis to format the dimension value.
dimension_value_.text = view_->format( dimension_value_.value);
if ( !note_.isEmpty() )
dimension_value_.text += " " + note_;
dimension_value_.face_data_.font_ = view_->dimensionFont();
// Measure the value string in its unrotated state
dimension_value_.face_data_.orientation_ = 0;
OGLFT::BBox bbox =
view_->font(dimension_value_.face_data_)->measure( dimension_value_.text );
// Use (half) a zero's width as extra spacing around the value
// in the dimension line
bbox += view_->font(dimension_value_.face_data_)->measure( '0' );
// A bbox vector is somewhat easier to use than the OGLFT BBox.
dimension_value_.bbox = ( Point( bbox.x_max_, bbox.y_max_ ) -
Point( bbox.x_min_, bbox.y_min_ ) );
// The actual orientation at which the text is drawn is determined
// by the normal vector. See the programming notes for an explanation.
double angle = rint( normal_.orientation() );
if ( angle < 0 ) angle += 360.;
double text_rotation;
if ( angle > 0 && angle <= 180. )
text_rotation = angle - 90.;
else
text_rotation = angle + 90.;
dimension_value_.face_data_.orientation_ = (uint)text_rotation;
// Now I think we have enough information to compute the length of
// each extension line, which is the height of the dimension text,
// plus a bit of clearance at either end, plus any unevenness in
// the reference line alignments, plus any aesthetic modification
// made by the user.
dimension_line_.clearance = view_->clearance();
double end0_length = dimension_value_.bbox[Y] +
view_->scale() * ( 2. * dimension_line_.clearance + extension_offset_ ) +
d0;
double end1_length = dimension_value_.bbox[Y] +
view_->scale() * ( 2. * dimension_line_.clearance + extension_offset_ ) +
d1;
extension_lines_[END0].offset = extension_lines_[END1].offset
= view_->extensionLineOffset();
extension_lines_[END0].from_ = end0_ +
view_->scale() * extension_lines_[END0].offset * normal_;
extension_lines_[END1].from_ = end1_ +
view_->scale() * extension_lines_[END1].offset * normal_;
extension_lines_[END0].to_ =
extension_lines_[END0].from_ + end0_length * normal_;
extension_lines_[END1].to_ =
extension_lines_[END1].from_ + end1_length * normal_;
arrows_[END0].to_ = extension_lines_[END0].to_ -
( view_->scale() * dimension_line_.clearance + dimension_value_.bbox[Y]/2.) *
normal_;
arrows_[END1].to_ = extension_lines_[END1].to_ -
( view_->scale() * dimension_line_.clearance + dimension_value_.bbox[Y]/2.) *
normal_;
// The size of an arrow head depends on the scale of the OpenGL view,
// so adjust that accordingly.
double arrow_head_length = view_->arrowHeadLength() * view_->scale();
arrow_.setLength( arrow_head_length );
arrow_.setStyle( view_->arrowHeadStyle() );
arrow_.setWidthRatio( view_->arrowHeadWidthRatio() );
locator_.use_ = false;
// Now we have to fit the dimension text and choose a position
if ( dimension_value_.bbox[X] + 2.*arrow_.length() < dimension_value_.value ) {
switch ( dimension_value_.placement ) {
case INTERIOR:
if ( fabs( dimension_offset_ ) <= dimension_value_.value / 2. ) {
if ( fabs( dimension_offset_ ) <=
( ( dimension_value_.value - dimension_value_.bbox[X] ) / 2 -
arrow_.length() ) ) {
// Interior dimension, interior arrows
arrows_[END0].from_ = arrows_[END0].to_ +
0.5 * ( dl - ( dimension_value_.bbox[X] - 2. * dimension_offset_ )*e);
arrows_[END1].from_ = arrows_[END1].to_ -
0.5 * ( dl - ( dimension_value_.bbox[X] + 2. * dimension_offset_ )*e);
dimension_value_.position = arrows_[END0].to_ + 0.5 * dl +
dimension_offset_ * e;
}
else if ( dimension_offset_ < 0 ) {
arrows_[END0].from_ = arrows_[END0].to_ + arrow_.length() * e;
arrows_[END1].from_ = arrows_[END1].to_ -
( dl - ( dimension_value_.bbox[X] + arrow_.length() ) * e );
dimension_value_.position = arrows_[END0].to_ +
( arrow_.length() + 0.5 * dimension_value_.bbox[X] ) * e;
}
else {
arrows_[END0].from_ = arrows_[END0].to_ +
( dl - ( dimension_value_.bbox[X] + arrow_.length() ) * e );
arrows_[END1].from_ = arrows_[END1].to_ - arrow_.length() * e;
dimension_value_.position = arrows_[END1].to_ -
( arrow_.length() + 0.5 * dimension_value_.bbox[X] ) * e;
}
}
else {
// Exterior dimension, interior arrows
if ( dimension_offset_ < 0 ) {
dimension_value_.placement = EXTERIOR_END0;
dimension_offset_ = 0.;
dimension_value_.position = arrows_[END0].to_ -
0.5 * dimension_value_.bbox[X] * e;
}
else {
dimension_value_.placement = EXTERIOR_END1;
dimension_offset_ = 0.;
dimension_value_.position = arrows_[END1].to_ +
0.5 * dimension_value_.bbox[X] * e;
}
// The arrows fill the interior.
arrows_[END0].from_ = arrows_[END0].to_ + 0.5 * dl;
arrows_[END1].from_ = arrows_[END1].to_ - 0.5 * dl;
}
break;
case EXTERIOR_END0:
if ( dimension_offset_ <= 0 ) {
// The arrows fill the interior.
arrows_[END0].from_ = arrows_[END0].to_ + 0.5 * dl;
arrows_[END1].from_ = arrows_[END1].to_ - 0.5 * dl;
dimension_value_.position = arrows_[END0].to_ -
( 0.5 * dimension_value_.bbox[X] -
view_->scale() * dimension_offset_ ) * e;
locator_.use_ = true;
locator_.to_ = arrows_[END0].to_;
locator_.from_ = locator_.to_ + view_->scale() * dimension_offset_ * e;
}
else {
// If the dimension text switches back to an INTERIOR position,
// align it with END0 arrow.
dimension_value_.placement = INTERIOR;
dimension_offset_ = -dimension_value_.value / 2;
arrows_[END0].from_ = arrows_[END0].to_ +
0.5 * ( dl - ( dimension_value_.bbox[X] - 2. * dimension_offset_ )*e);
arrows_[END1].from_ = arrows_[END1].to_ -
0.5 * ( dl - ( dimension_value_.bbox[X] + 2. * dimension_offset_ )*e);
dimension_value_.position = arrows_[END0].to_ + 0.5 * dl +
dimension_offset_ * e;
}
break;
case EXTERIOR_END1:
if ( dimension_offset_ >= 0 ) {
// The arrows fill the interior.
arrows_[END0].from_ = arrows_[END0].to_ + 0.5 * dl;
arrows_[END1].from_ = arrows_[END1].to_ - 0.5 * dl;
dimension_value_.position = arrows_[END1].to_ +
( 0.5 * dimension_value_.bbox[X] +
view_->scale() * dimension_offset_ ) * e;
locator_.use_ = true;
locator_.to_ = arrows_[END1].to_;
locator_.from_ = locator_.to_ + view_->scale() * dimension_offset_ * e;
}
else {
// If the dimension text switches back to an INTERIOR position,
// align it with END0 arrow.
dimension_value_.placement = INTERIOR;
dimension_offset_ = dimension_value_.value / 2;
arrows_[END0].from_ = arrows_[END0].to_ +
0.5 * ( dl - ( dimension_value_.bbox[X] - 2. * dimension_offset_ )*e);
arrows_[END1].from_ = arrows_[END1].to_ -
0.5 * ( dl - ( dimension_value_.bbox[X] + 2. * dimension_offset_ )*e);
dimension_value_.position = arrows_[END0].to_ + 0.5 * dl +
dimension_offset_ * e;
}
break;
}
}
else if ( dimension_value_.bbox[X] < dimension_value_.value ) {
// Interior dimension, exterior arrows: assume twice the
// arrow head length for length of arrow
arrows_[END0].from_ =
arrows_[END0].to_ - 2. * arrow_.length() * e;
arrows_[END1].from_ =
arrows_[END1].to_ + 2. * arrow_.length() * e;
dimension_value_.position = arrows_[END0].to_ + 0.5 * dl;
}
else {
// Exterior dimension, exterior arrows: assume twice the
// arrow head length for length of arrow
arrows_[END0].from_ =
arrows_[END0].to_ - 2. * arrow_.length() * e;
arrows_[END1].from_ =
arrows_[END1].to_ + 2. * arrow_.length() * e;
// The end at which the dimension shows up should be selectable
// by the user...for now we'll try to keep it to the left/below
// (This is not wholly accurate...)
if ( dl * e >= 0 )
dimension_value_.position = arrows_[END0].from_ -
0.5 * dimension_value_.bbox[X] * e;
else
dimension_value_.position = arrows_[END1].from_ -
0.5 * dimension_value_.bbox[X] * e;
}
}
} // End of Space2D namespace
namespace Space3D {
Dimension::Dimension ( OpenGLBase* view )
: view_( view ), mode_( lC::Render::INVISIBLE )
{
init();
}
Dimension::Dimension ( const Point& end0, const Point& end1, const Vector& normal,
OpenGLBase* view, const QString& note )
: end0_( end0 ), end1_( end1 ), normal_( normal ), view_( view ), note_( note ),
mode_( lC::Render::INVISIBLE )
{
init();
computeLayout();
}
void Dimension::init ( void )
{
extension_offset_ = 0.;
dimension_offset_ = 0.;
dimension_value_.placement = INTERIOR;
extension_lines_[END0].use_ = true;
extension_lines_[END1].use_ = true;
dimension_value_.face_data_.horizontal_justification_ = lC::CENTER;
dimension_value_.face_data_.vertical_justification_ = lC::MIDDLE;
}
void Dimension::setEndsNormal ( const Point& end0, const Point& end1,
const Vector& normal, OpenGLBase* view,
const QString& note )
{
end0_ = end0;
end1_ = end1;
normal_ = normal;
view_ = view;
note_ = note;
computeLayout();
}
void Dimension::setUseExtensionLine ( bool use_end0, bool use_end1 )
{
extension_lines_[END0].use_ = use_end0;
extension_lines_[END1].use_ = use_end1;
}
void Dimension::setDimensionAttributes ( double extension_offset,
double dimension_offset,
enum Placement placement )
{
extension_offset_ = extension_offset;
dimension_offset_ = dimension_offset;
dimension_value_.placement = placement;
computeLayout();
}
void Dimension::setMode ( lC::Render::Mode mode )
{
mode_ = mode;
}
void Dimension::setViewNormal ( const Vector& view_normal )
{
arrow_.setViewNormal( view_normal );
dimension_value_.bb_ll_ =
view_->unproject3D( Space2D::Point( dimension_value_.bb_min_[X],
dimension_value_.bb_min_[Y] ) );
dimension_value_.bb_lr_ =
view_->unproject3D( Space2D::Point( dimension_value_.bb_max_[X],
dimension_value_.bb_min_[Y] ) );
dimension_value_.bb_ur_ =
view_->unproject3D( Space2D::Point( dimension_value_.bb_max_[X],
dimension_value_.bb_max_[Y] ) );
dimension_value_.bb_ul_ =
view_->unproject3D( Space2D::Point( dimension_value_.bb_min_[X],
dimension_value_.bb_max_[Y] ) );
}
void Dimension::adjustExtension ( const Vector& delta )
{
extension_offset_ += ( delta * normal_ ) / view_->scale();
computeLayout();
}
void Dimension::adjustDimension ( const Vector& delta )
{
extension_offset_ += ( delta * normal_ ) / view_->scale();
Vector dl = end1_ - end0_;
Vector e = normal_;
Vector z = e.cross( dl );
e.rotate( -90, z );
e = ( dl * e ) * e;
e.normalize();
// If the dimension text is INTERIOR, then its dimension offset is
// stored in scale inches. Otherwise, its offset is stored in
// paper inches. Why? As the view is rescaled, an INTERIOR
// dimension retains its relative position between the extension
// lines (e.g, it might be 25% of the way from END0 to END1). On
// the other hand, an EXTERIOR dimension text maintains the same
// paper distance from its END (e.g. it's always 1/4" from the
// END0 extension line).
switch ( dimension_value_.placement ) {
case INTERIOR:
dimension_offset_ += delta * e;
break;
case EXTERIOR_END0: case EXTERIOR_END1:
dimension_offset_ += ( delta * e ) / view_->scale();
}
computeLayout();
}
void Dimension::draw ( void ) const
{
if ( mode_ == lC::Render::INVISIBLE ) return;
QColor color = view_->constraintPrimaryColor();
if ( mode_ == lC::Render::HIGHLIGHTED || mode_ == lC::Render::ACTIVATED )
color = color.light();
// Avoid changing dimension state so this method remains "const".
FaceData face_data = dimension_value_.face_data_;
face_data.color_ = color.rgb();
view_->font(face_data)->draw( dimension_value_.position[X],
dimension_value_.position[Y],
dimension_value_.position[Z],
dimension_value_.text );
glColor3ubv( lC::qCubv( color ) );
if ( locator_.use_ ) {
glBegin( GL_LINES );
glVertex3dv( locator_.from_ );
glVertex3dv( locator_.to_ );
glEnd();
}
arrow_.draw( arrows_[END1].from_, arrows_[END1].to_ );
if ( extension_lines_[END1].use_ ) {
glBegin( GL_LINES );
glVertex3dv( extension_lines_[END1].from_ );
glVertex3dv( extension_lines_[END1].to_ );
glEnd();
}
if ( mode_ == lC::Render::HIGHLIGHTED || mode_ == lC::Render::ACTIVATED ) {
color = view_->constraintSecondaryColor().light();
glColor3ubv( lC::qCubv( color ) );
}
if ( extension_lines_[END0].use_ ) {
glBegin( GL_LINES );
glVertex3dv( extension_lines_[END0].from_ );
glVertex3dv( extension_lines_[END0].to_ );
glEnd();
}
arrow_.draw( arrows_[END0].from_, arrows_[END0].to_ );
if ( mode_ == lC::Render::HIGHLIGHTED || mode_ == lC::Render::ACTIVATED ) {
ResizeHandle::draw( view_, mode_, arrows_[END0].to_ );
ResizeHandle::draw( view_, mode_, arrows_[END1].to_ );
}
}
void Dimension::select ( void ) const
{
if ( mode_ == lC::Render::INVISIBLE ) return;
glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
glPushMatrix();
// Drawn position.
glTranslated( dimension_value_.position[X], dimension_value_.position[Y],
dimension_value_.position[Z] );
// Adjust for centering.
Point center = dimension_value_.bb_ll_ +
0.5 * ( dimension_value_.bb_ur_ - dimension_value_.bb_ll_ );
glTranslated( -center[X], -center[Y], -center[Z] );
glPushName( 1 );
glBegin( GL_QUADS );
glVertex3dv( dimension_value_.bb_ll_ );
glVertex3dv( dimension_value_.bb_lr_ );
glVertex3dv( dimension_value_.bb_ur_ );
glVertex3dv( dimension_value_.bb_ul_ );
glEnd();
glPopName();
glPopMatrix();
arrow_.select( arrows_[END0].from_, arrows_[END0].to_ );
arrow_.select( arrows_[END1].from_, arrows_[END1].to_ );
glBegin( GL_LINES );
if ( extension_lines_[END0].use_ ) {
glVertex3dv( extension_lines_[END0].from_ );
glVertex3dv( extension_lines_[END0].to_ );
}
if ( extension_lines_[END1].use_ ) {
glVertex3dv( extension_lines_[END1].from_ );
glVertex3dv( extension_lines_[END1].to_ );
}
if ( locator_.use_ ) {
glVertex3dv( locator_.from_ );
glVertex3dv( locator_.to_ );
}
glEnd();
if ( mode_ == lC::Render::ACTIVATED ) {
ResizeHandle::select( view_, arrows_[END0].to_ );
ResizeHandle::select( view_, arrows_[END1].to_ );
}
}
void Dimension::computeLayout ( void )
{
// This confuses even me. In the design documentation, there are
// some notes about the vector computations involved here.
// The delta vector; obviously, the vector from the first end to
// the second end
Vector dl = end1_ - end0_;
// e is the unit vector in the direction of the dimension line,
// i.e. it is perpendicular to the extension line direction.
// Note that in 3D, you need to explicitly give the direction
// about which rotation of a vector is to take place.
Vector e = normal_;
Vector z = e.cross( dl );
// If the effective separation of the two end-points is 0 (which
// is not unreasonable), then e is arbitrary (to the extent it
// is at least normal to dl).
if ( fabs( z * z ) < lC::EPSILON ) {
z = dl;
if ( fabs( z * z ) > lC::EPSILON ) {
z.normalize();
if ( fabs( fabs( z * Vector( 1, 0, 0 ) - 1. ) > lC::EPSILON ) )
e = Vector( 1, 0, 0 );
else
e = Vector( 0, 1, 0 );
}
else
e = Vector( 1, 0, 0 );
}
else {
e.rotate( -90, z );
e.normalize();
}
// The displayed value of the dimension is the projection of the
// delta vector onto e.
dimension_value_.value = fabs( dl * e );
// If e is not parallel to dl, then there will be a difference in
// the length of the extension lines. That difference is just
// equal to the projection of the delta vector onto the extension
// line direction.
double extra = dl * normal_;
double d0 = 0., d1 = 0.;
// The sign of the extra length determines whether it applies to
// the first or second end. Ultimately, the extension line lengths
// are positive.
if ( extra > 0 )
d0 = extra;
else
d1 = -extra;
// Convert the delta vector into the dimension line vector. This
// computation, (dl*e)*e, basically picks the component of the
// delta vector in the direction of e but it also corrects the
// sign of e which the rotate(-90) above might have miscomputed.
dl = ( dl * e ) * e;
if ( dimension_value_.value != 0 ) {
e = dl;
e.normalize();
}
// Compute the metrics of the dimension string. Start by asking the
// LengthUnit basis to format the dimension value.
dimension_value_.text = view_->format( dimension_value_.value);
if ( !note_.isEmpty() )
dimension_value_.text += " " + note_;
dimension_value_.face_data_.font_ = view_->dimensionFont();
// Measure the value string in its unrotated state
dimension_value_.face_data_.orientation_ = 0;
OGLFT::BBox bbox =
view_->font(dimension_value_.face_data_)->measureRaw( dimension_value_.text );
// Use (half) a zero's width as extra spacing around the value
// in the dimension line
bbox += view_->font(dimension_value_.face_data_)->measureRaw( "0" );
// The bounding box size is in pixels. Convert it to the current
// modeling coordinates. Very complicated...
dimension_value_.bb_min_ = Space2D::Point( bbox.x_min_, bbox.y_min_ );
dimension_value_.bb_max_ = Space2D::Point( bbox.x_max_, bbox.y_max_ );
dimension_value_.bb_ll_ = view_->unproject3D( Space2D::Point( bbox.x_min_,
bbox.y_min_ ) );
dimension_value_.bb_lr_ = view_->unproject3D( Space2D::Point( bbox.x_max_,
bbox.y_min_ ) );
dimension_value_.bb_ur_ = view_->unproject3D( Space2D::Point( bbox.x_max_,
bbox.y_max_ ) );
dimension_value_.bb_ul_ = view_->unproject3D( Space2D::Point( bbox.x_min_,
bbox.y_max_ ) );
double text_width =
(dimension_value_.bb_lr_ - dimension_value_.bb_ll_).length();
double text_height =
(dimension_value_.bb_ul_ - dimension_value_.bb_ll_).length();
// In 3D, I guess I'll just have the text drawn horizontally all the
// time.
#if 0
// The actual orientation at which the text is drawn is determined
// by the normal vector. See the programming notes for an explanation.
double angle = rint( normal_.orientation() );
if ( angle < 0 ) angle += 360.;
double text_rotation;
if ( angle > 0 && angle <= 180. )
text_rotation = angle - 90.;
else
text_rotation = angle + 90.;
dimension_value_.face_data_.orientation_ = (uint)text_rotation;
#endif
// Now I think we have enough information to compute the length of
// each extension line, which is the height of the dimension text,
// plus a bit of clearance at either end, plus any unevenness in
// the reference line alignments, plus any aesthetic modification
// made by the user.
dimension_line_.clearance = view_->clearance();
double end0_length = text_height +
view_->scale() * ( 2. * dimension_line_.clearance + extension_offset_ ) +
d0;
double end1_length = text_height +
view_->scale() * ( 2. * dimension_line_.clearance + extension_offset_ ) +
d1;
extension_lines_[END0].offset = extension_lines_[END1].offset
= view_->extensionLineOffset();
extension_lines_[END0].from_ = end0_ +
view_->scale() * extension_lines_[END0].offset * normal_;
extension_lines_[END1].from_ = end1_ +
view_->scale() * extension_lines_[END1].offset * normal_;
extension_lines_[END0].to_ =
extension_lines_[END0].from_ + end0_length * normal_;
extension_lines_[END1].to_ =
extension_lines_[END1].from_ + end1_length * normal_;
arrows_[END0].to_ = extension_lines_[END0].to_ -
( view_->scale() * dimension_line_.clearance + text_height/2.) *
normal_;
arrows_[END1].to_ = extension_lines_[END1].to_ -
( view_->scale() * dimension_line_.clearance + text_height/2.) *
normal_;
// The size of an arrow head depends on the scale of the OpenGL view,
// so adjust that accordingly.
double arrow_head_length = view_->arrowHeadLength() * view_->scale();
arrow_.setLength( arrow_head_length );
arrow_.setStyle( view_->arrowHeadStyle() );
arrow_.setWidthRatio( view_->arrowHeadWidthRatio() );
locator_.use_ = false;
// Now we have to fit the dimension text and choose a position
if ( text_width + 2.*arrow_.length() < dimension_value_.value ) {
switch ( dimension_value_.placement ) {
case INTERIOR:
if ( fabs( dimension_offset_ ) <= dimension_value_.value / 2. ) {
if ( fabs( dimension_offset_ ) <=
( ( dimension_value_.value - text_width ) / 2 -
arrow_.length() ) ) {
// Interior dimension, interior arrows
arrows_[END0].from_ = arrows_[END0].to_ +
0.5 * ( dl - ( text_width - 2. * dimension_offset_ )*e);
arrows_[END1].from_ = arrows_[END1].to_ -
0.5 * ( dl - ( text_width + 2. * dimension_offset_ )*e);
dimension_value_.position = arrows_[END0].to_ + 0.5 * dl +
dimension_offset_ * e;
}
else if ( dimension_offset_ < 0 ) {
arrows_[END0].from_ = arrows_[END0].to_ + arrow_.length() * e;
arrows_[END1].from_ = arrows_[END1].to_ -
( dl - ( text_width + arrow_.length() ) * e );
dimension_value_.position = arrows_[END0].to_ +
( arrow_.length() + 0.5 * text_width ) * e;
}
else {
arrows_[END0].from_ = arrows_[END0].to_ +
( dl - ( text_width + arrow_.length() ) * e );
arrows_[END1].from_ = arrows_[END1].to_ - arrow_.length() * e;
dimension_value_.position = arrows_[END1].to_ -
( arrow_.length() + 0.5 * text_width ) * e;
}
}
else {
// Exterior dimension, interior arrows
if ( dimension_offset_ < 0 ) {
dimension_value_.placement = EXTERIOR_END0;
dimension_offset_ = 0.;
dimension_value_.position = arrows_[END0].to_ -
0.5 * text_width * e;
}
else {
dimension_value_.placement = EXTERIOR_END1;
dimension_offset_ = 0.;
dimension_value_.position = arrows_[END1].to_ +
0.5 * text_width * e;
}
// The arrows fill the interior.
arrows_[END0].from_ = arrows_[END0].to_ + 0.5 * dl;
arrows_[END1].from_ = arrows_[END1].to_ - 0.5 * dl;
}
break;
case EXTERIOR_END0:
if ( dimension_offset_ <= 0 ) {
// The arrows fill the interior.
arrows_[END0].from_ = arrows_[END0].to_ + 0.5 * dl;
arrows_[END1].from_ = arrows_[END1].to_ - 0.5 * dl;
dimension_value_.position = arrows_[END0].to_ -
( 0.5 * text_width -
view_->scale() * dimension_offset_ ) * e;
locator_.use_ = true;
locator_.to_ = arrows_[END0].to_;
locator_.from_ = locator_.to_ + view_->scale() * dimension_offset_ * e;
}
else {
// If the dimension text switches back to an INTERIOR position,
// align it with END0 arrow.
dimension_value_.placement = INTERIOR;
dimension_offset_ = -dimension_value_.value / 2;
arrows_[END0].from_ = arrows_[END0].to_ +
0.5 * ( dl - ( text_width - 2. * dimension_offset_ )*e);
arrows_[END1].from_ = arrows_[END1].to_ -
0.5 * ( dl - ( text_width + 2. * dimension_offset_ )*e);
dimension_value_.position = arrows_[END0].to_ + 0.5 * dl +
dimension_offset_ * e;
}
break;
case EXTERIOR_END1:
if ( dimension_offset_ >= 0 ) {
// The arrows fill the interior.
arrows_[END0].from_ = arrows_[END0].to_ + 0.5 * dl;
arrows_[END1].from_ = arrows_[END1].to_ - 0.5 * dl;
dimension_value_.position = arrows_[END1].to_ +
( 0.5 * text_width +
view_->scale() * dimension_offset_ ) * e;
locator_.use_ = true;
locator_.to_ = arrows_[END1].to_;
locator_.from_ = locator_.to_ + view_->scale() * dimension_offset_ * e;
}
else {
// If the dimension text switches back to an INTERIOR position,
// align it with END0 arrow.
dimension_value_.placement = INTERIOR;
dimension_offset_ = dimension_value_.value / 2;
arrows_[END0].from_ = arrows_[END0].to_ +
0.5 * ( dl - ( text_width - 2. * dimension_offset_ )*e);
arrows_[END1].from_ = arrows_[END1].to_ -
0.5 * ( dl - ( text_width + 2. * dimension_offset_ )*e);
dimension_value_.position = arrows_[END0].to_ + 0.5 * dl +
dimension_offset_ * e;
}
break;
}
}