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spline.cpp
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spline.cpp
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/*
Copyright (C) 2009 Andrew Caudwell (acaudwell@gmail.com)
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
3 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, see <http://www.gnu.org/licenses/>.
*/
#include "spline.h"
SplineEdge::SplineEdge() {
}
void SplineEdge::update(const vec2f& pos1, const vec4f& col1, const vec2f& pos2, const vec4f& col2, const vec2f& spos) {
vec2f pt_last;
vec4f col_last;
vec2f mid = (pos1 - pos2) * 0.5;
vec2f to = vec2f(pos1 - spos);
float dp = std::min(1.0f, to.normal().dot(mid.normal()));
float ang = acos(dp) / PI;
int edge_detail = std::min(10, (int) (ang * 100.0));
if(edge_detail<1) edge_detail = 1;
spline_point.clear();
spline_colour.clear();
spline_point.reserve(edge_detail+1);
spline_colour.reserve(edge_detail+1);
//calculate positions
for(int i=0; i <= edge_detail; i++) {
float t = (float)i/edge_detail;
float tt = 1.0f-t;
vec2f p0 = pos1 * t + spos * tt;
vec2f p1 = spos * t + pos2 * tt;
vec2f pt = p0 * t + p1 * tt;
vec4f coln = col1 * t + col2 * tt;
spline_point.push_back(pt);
spline_colour.push_back(coln);
}
midpoint = pos1 * 0.25 + pos2 * 0.25 + spos * 0.5;
}
const vec2f& SplineEdge::getMidPoint() const {
return midpoint;
}
void SplineEdge::drawToVBO(quadbuf& buffer) const {
int edges_count = spline_point.size() - 1;
for(int i=0; i < edges_count; i++) {
vec2f perp = (spline_point[i] - spline_point[i+1]).perpendicular().normal() * 2.5f;
quadbuf_vertex v1(spline_point[i] + perp, spline_colour[i], vec2f(1.0f, 0.0f));
quadbuf_vertex v2(spline_point[i] - perp, spline_colour[i], vec2f(0.0f, 0.0f));
quadbuf_vertex v3(spline_point[i+1] - perp, spline_colour[i+1], vec2f(0.0f, 0.0f));
quadbuf_vertex v4(spline_point[i+1] + perp, spline_colour[i+1], vec2f(1.0f, 0.0f));
buffer.add(0, v1, v2, v3, v4);
}
}
void SplineEdge::drawBeam(const vec2f & pos1, const vec4f & col1, const vec2f & pos2, const vec4f & col2, float radius, bool first) const{
vec2f perp = (pos1 - pos2).perpendicular().normal() * radius;
// src point
if(first) {
glColor4fv(col1);
glTexCoord2f(1.0,0.0);
glVertex2f(pos1.x + perp.x, pos1.y + perp.y);
glTexCoord2f(0.0,0.0);
glVertex2f(pos1.x - perp.x, pos1.y - perp.y);
}
// dest point
glColor4fv(col2);
glTexCoord2f(1.0,0.0);
glVertex2f(pos2.x + perp.x, pos2.y + perp.y);
glTexCoord2f(0.0,0.0);
glVertex2f(pos2.x - perp.x, pos2.y - perp.y);
}
void SplineEdge::drawShadow() const{
int edges_count = spline_point.size() - 1;
vec2f offset(2.0, 2.0);
glBegin(GL_QUAD_STRIP);
for(int i=0;i<edges_count;i++) {
drawBeam(spline_point[i] + offset, vec4f(0.0, 0.0, 0.0, gGourceShadowStrength), spline_point[i+1] + offset, vec4f(0.0, 0.0, 0.0, gGourceShadowStrength), 2.5, i==0);
}
glEnd();
}
void SplineEdge::draw() const{
int edges_count = spline_point.size() - 1;
glBegin(GL_QUAD_STRIP);
for(int i=0;i<edges_count;i++) {
drawBeam(spline_point[i], spline_colour[i], spline_point[i+1], spline_colour[i+1], 2.5, i==0);
}
glEnd();
}