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/* 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 <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "chipmunk.h"
#include "drawSpace.h"
#include "ChipmunkDemo.h"
#include "chipmunk_unsafe.h"
static cpSpace *space;
extern cpVect mousePoint;
static cpShape *querySeg = NULL;
static void
update(int ticks)
{
messageString[0] = '\0';
cpVect start = cpvzero;
cpVect end = /*cpv(0, 85);//*/mousePoint;
cpVect lineEnd = end;
{
char infoString[1024];
sprintf(infoString, "Query: Dist(%f) Point%s, ", cpvdist(start, end), cpvstr(end));
strcat(messageString, infoString);
}
cpSegmentQueryInfo info = {};
if(cpSpaceSegmentQueryFirst(space, start, end, CP_ALL_LAYERS, CP_NO_GROUP, &info)){
cpVect point = cpSegmentQueryHitPoint(start, end, info);
lineEnd = cpvadd(point, cpvzero);//cpvmult(info.n, 4.0f));
char infoString[1024];
sprintf(infoString, "Segment Query: Dist(%f) Normal%s", cpSegmentQueryHitDist(start, end, info), cpvstr(info.n));
strcat(messageString, infoString);
} else {
strcat(messageString, "Segment Query (None)");
}
cpSegmentShapeSetEndpoints(querySeg, start, lineEnd);
cpShapeCacheBB(querySeg); // force it to update it's collision detection data so it will draw
// normal other stuff.
int steps = 1;
cpFloat dt = 1.0f/60.0f/(cpFloat)steps;
for(int i=0; i<steps; i++){
cpSpaceStep(space, dt);
}
}
static cpSpace *
init(void)
{
cpResetShapeIdCounter();
space = cpSpaceNew();
space->elasticIterations = 0;
space->iterations = 5;
cpSpaceResizeStaticHash(space, 40.0f, 999);
cpSpaceResizeActiveHash(space, 30.0f, 2999);
cpBody *staticBody = &space->staticBody;
cpShape *shape;
// add a non-collidable segment as a quick and dirty way to draw the query line
shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpvzero, cpv(100.0f, 0.0f), 4.0f));
shape->layers = 0;
querySeg = shape;
{ // add a fat segment
cpFloat mass = 1.0f;
cpFloat length = 100.0f;
cpVect a = cpv(-length/2.0f, 0.0f), b = cpv(length/2.0f, 0.0f);
cpBody *body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForSegment(mass, a, b)));
body->p = cpv(0.0f, 100.0f);
cpSpaceAddShape(space, cpSegmentShapeNew(body, a, b, 20.0f));
}
{ // add a static segment
cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(0, 300), cpv(300, 0), 0.0f));
}
{ // add a pentagon
cpFloat mass = 1.0f;
const int NUM_VERTS = 5;
cpVect verts[NUM_VERTS];
for(int i=0; i<NUM_VERTS; i++){
cpFloat angle = -2*M_PI*i/((cpFloat) NUM_VERTS);
verts[i] = cpv(30*cos(angle), 30*sin(angle));
}
cpBody *body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForPoly(mass, NUM_VERTS, verts, cpvzero)));
body->p = cpv(50.0f, 50.0f);
cpSpaceAddShape(space, cpPolyShapeNew(body, NUM_VERTS, verts, cpvzero));
}
{ // add a circle
cpFloat mass = 1.0f;
cpFloat r = 20.0f;
cpBody *body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForCircle(mass, 0.0f, r, cpvzero)));
body->p = cpv(100.0f, 100.0f);
cpSpaceAddShape(space, cpCircleShapeNew(body, r, cpvzero));
}
return space;
}
static void
destroy(void)
{
cpSpaceFreeChildren(space);
cpSpaceFree(space);
}
chipmunkDemo Query = {
"Segment Query",
NULL,
init,
update,
destroy,
};