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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 "chipmunk/chipmunk.h"
#include "ChipmunkDemo.h"
static cpVect QUERY_START = {0,0};
static void
update(cpSpace *space, double dt)
{
cpSpaceStep(space, dt);
if(ChipmunkDemoRightClick){
QUERY_START = ChipmunkDemoMouse;
}
cpVect start = QUERY_START;
cpVect end = ChipmunkDemoMouse;
cpFloat radius = 10.0;
ChipmunkDebugDrawSegment(start, end, RGBAColor(0,1,0,1));
ChipmunkDemoPrintString("Query: Dist(%f) Point(%5.2f, %5.2f), ", cpvdist(start, end), end.x, end.y);
cpSegmentQueryInfo segInfo = {0};
if(cpSpaceSegmentQueryFirst(space, start, end, radius, CP_SHAPE_FILTER_ALL, &segInfo)){
cpVect point = segInfo.point;
cpVect n = segInfo.normal;
// Draw blue over the occluded part of the query
ChipmunkDebugDrawSegment(cpvlerp(start, end, segInfo.alpha), end, RGBAColor(0,0,1,1));
// Draw a little red surface normal
ChipmunkDebugDrawSegment(point, cpvadd(point, cpvmult(n, 16)), RGBAColor(1,0,0,1));
// Draw a little red dot on the hit point.
ChipmunkDebugDrawDot(3, point, RGBAColor(1,0,0,1));
ChipmunkDemoPrintString("Segment Query: Dist(%f) Normal(%5.2f, %5.2f)", segInfo.alpha*cpvdist(start, end), n.x, n.y);
} else {
ChipmunkDemoPrintString("Segment Query (None)");
}
// Draw a fat green line over the unoccluded part of the query
ChipmunkDebugDrawFatSegment(start, cpvlerp(start, end, segInfo.alpha), radius, RGBAColor(0,1,0,1), LAColor(0,0));
cpPointQueryInfo nearestInfo = {0};
cpSpacePointQueryNearest(space, ChipmunkDemoMouse, 100.0, CP_SHAPE_FILTER_ALL, &nearestInfo);
if(nearestInfo.shape){
// Draw a grey line to the closest shape.
ChipmunkDebugDrawDot(3, ChipmunkDemoMouse, RGBAColor(0.5, 0.5, 0.5, 1.0));
ChipmunkDebugDrawSegment(ChipmunkDemoMouse, nearestInfo.point, RGBAColor(0.5, 0.5, 0.5, 1.0));
// Draw a red bounding box around the shape under the mouse.
if(nearestInfo.distance < 0) ChipmunkDebugDrawBB(cpShapeGetBB(nearestInfo.shape), RGBAColor(1,0,0,1));
}
}
static cpSpace *
init(void)
{
QUERY_START = cpvzero;
cpSpace *space = cpSpaceNew();
cpSpaceSetIterations(space, 5);
{ // 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, 0.0f)));
cpBodySetPosition(body, cpv(0.0f, 100.0f));
cpSpaceAddShape(space, cpSegmentShapeNew(body, a, b, 20.0f));
}
{ // add a static segment
cpSpaceAddShape(space, cpSegmentShapeNew(cpSpaceGetStaticBody(space), cpv(0, 300), cpv(300, 0), 0.0f));
}
{ // add a pentagon
cpFloat mass = 1.0f;
cpVect verts[5];
for(int i=0; i<5; i++){
cpFloat angle = -2.0f*CP_PI*i/((cpFloat) 5);
verts[i] = cpv(30*cos(angle), 30*sin(angle));
}
cpBody *body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForPoly(mass, 5, verts, cpvzero, 0.0f)));
cpBodySetPosition(body, cpv(50.0f, 30.0f));
cpSpaceAddShape(space, cpPolyShapeNew(body, 5, verts, cpTransformIdentity, 10.0f));
}
{ // add a circle
cpFloat mass = 1.0f;
cpFloat r = 20.0f;
cpBody *body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForCircle(mass, 0.0f, r, cpvzero)));
cpBodySetPosition(body, cpv(100.0f, 100.0f));
cpSpaceAddShape(space, cpCircleShapeNew(body, r, cpvzero));
}
return space;
}
static void
destroy(cpSpace *space)
{
ChipmunkDemoFreeSpaceChildren(space);
cpSpaceFree(space);
}
ChipmunkDemo Query = {
"Segment Query",
1.0/60.0,
init,
update,
ChipmunkDemoDefaultDrawImpl,
destroy,
};
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