/* Copyright (c) 2007 Scott Lembcke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <string.h>
#include "chipmunk.h"
#include "ChipmunkDemo.h"
static cpFloat
springForce(cpConstraint *spring, cpFloat dist)
{
cpFloat clamp = 20.0f;
return cpfclamp(cpDampedSpringGetRestLength(spring) - dist, -clamp, clamp)*cpDampedSpringGetStiffness(spring);
}
static cpConstraint *
new_spring(cpBody *a, cpBody *b, cpVect anchr1, cpVect anchr2, cpFloat restLength, cpFloat stiff, cpFloat damp)
{
cpConstraint *spring = cpDampedSpringNew(a, b, anchr1, anchr2, restLength, stiff, damp);
cpDampedSpringSetSpringForceFunc(spring, springForce);
return spring;
}
static void
update(cpSpace *space)
{
int steps = 1;
cpFloat dt = 1.0f/60.0f/(cpFloat)steps;
for(int i=0; i<steps; i++){
cpSpaceStep(space, dt);
}
}
static cpBody *
add_bar(cpSpace *space, cpVect a, cpVect b, int group)
{
cpVect center = cpvmult(cpvadd(a, b), 1.0f/2.0f);
cpFloat length = cpvlength(cpvsub(b, a));
cpFloat mass = length/160.0f;
cpBody *body = cpSpaceAddBody(space, cpBodyNew(mass, mass*length*length/12.0f));
cpBodySetPos(body, center);
cpShape *shape = cpSpaceAddShape(space, cpSegmentShapeNew(body, cpvsub(a, center), cpvsub(b, center), 10.0f));
cpShapeSetGroup(shape, group);
return body;
}
static cpSpace *
init(void)
{
cpSpace *space = cpSpaceNew();
cpBody *staticBody = cpSpaceGetStaticBody(space);
cpBody *body1 = add_bar(space, cpv(-240, 160), cpv(-160, 80), 1);
cpBody *body2 = add_bar(space, cpv(-160, 80), cpv( -80, 160), 1);
cpBody *body3 = add_bar(space, cpv( 0, 160), cpv( 80, 0), 0);
cpBody *body4 = add_bar(space, cpv( 160, 160), cpv( 240, 160), 0);
cpBody *body5 = add_bar(space, cpv(-240, 0), cpv(-160, -80), 2);
cpBody *body6 = add_bar(space, cpv(-160, -80), cpv( -80, 0), 2);
cpBody *body7 = add_bar(space, cpv( -80, 0), cpv( 0, 0), 2);
cpBody *body8 = add_bar(space, cpv( 0, -80), cpv( 80, -80), 0);
cpBody *body9 = add_bar(space, cpv( 240, 80), cpv( 160, 0), 3);
cpBody *body10 = add_bar(space, cpv( 160, 0), cpv( 240, -80), 3);
cpBody *body11 = add_bar(space, cpv(-240, -80), cpv(-160, -160), 4);
cpBody *body12 = add_bar(space, cpv(-160, -160), cpv( -80, -160), 0);
cpBody *body13 = add_bar(space, cpv( 0, -160), cpv( 80, -160), 0);
cpBody *body14 = add_bar(space, cpv( 160, -160), cpv( 240, -160), 0);
cpSpaceAddConstraint(space, cpPivotJointNew2( body1, body2, cpv( 40,-40), cpv(-40,-40)));
cpSpaceAddConstraint(space, cpPivotJointNew2( body5, body6, cpv( 40,-40), cpv(-40,-40)));
cpSpaceAddConstraint(space, cpPivotJointNew2( body6, body7, cpv( 40, 40), cpv(-40, 0)));
cpSpaceAddConstraint(space, cpPivotJointNew2( body9, body10, cpv(-40,-40), cpv(-40, 40)));
cpSpaceAddConstraint(space, cpPivotJointNew2(body11, body12, cpv( 40,-40), cpv(-40, 0)));
cpFloat stiff = 100.0f;
cpFloat damp = 0.5f;
cpSpaceAddConstraint(space, new_spring(staticBody, body1, cpv(-320, 240), cpv(-40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body1, cpv(-320, 80), cpv(-40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body1, cpv(-160, 240), cpv(-40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body2, cpv(-160, 240), cpv( 40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body2, cpv( 0, 240), cpv( 40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body3, cpv( 80, 240), cpv(-40, 80), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body4, cpv( 80, 240), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body4, cpv( 320, 240), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body5, cpv(-320, 80), cpv(-40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body9, cpv( 320, 80), cpv( 40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body10, cpv( 320, 0), cpv( 40,-40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body10, cpv( 320,-160), cpv( 40,-40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body11, cpv(-320,-160), cpv(-40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body12, cpv(-240,-240), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body12, cpv( 0,-240), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body13, cpv( 0,-240), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body13, cpv( 80,-240), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body14, cpv( 80,-240), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body14, cpv( 240,-240), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(staticBody, body14, cpv( 320,-160), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body1, body5, cpv( 40,-40), cpv(-40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body1, body6, cpv( 40,-40), cpv( 40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body2, body3, cpv( 40, 40), cpv(-40, 80), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body3, body4, cpv(-40, 80), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body3, body4, cpv( 40,-80), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body3, body7, cpv( 40,-80), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body3, body7, cpv(-40, 80), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body3, body8, cpv( 40,-80), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body3, body9, cpv( 40,-80), cpv(-40,-40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body4, body9, cpv( 40, 0), cpv( 40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body5, body11, cpv(-40, 40), cpv(-40, 40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body5, body11, cpv( 40,-40), cpv( 40,-40), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body7, body8, cpv( 40, 0), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body8, body12, cpv(-40, 0), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body8, body13, cpv(-40, 0), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body8, body13, cpv( 40, 0), cpv( 40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring( body8, body14, cpv( 40, 0), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(body10, body14, cpv( 40,-40), cpv(-40, 0), 0.0f, stiff, damp));
cpSpaceAddConstraint(space, new_spring(body10, body14, cpv( 40,-40), cpv(-40, 0), 0.0f, stiff, damp));
return space;
}
static void
destroy(cpSpace *space)
{
ChipmunkDemoFreeSpaceChildren(space);
cpSpaceFree(space);
}
ChipmunkDemo Springies = {
"Springies",
init,
update,
ChipmunkDemoDefaultDrawImpl,
destroy,
};
