18 |
18 |
19 {$INCLUDE "options.inc"} |
19 {$INCLUDE "options.inc"} |
20 |
20 |
21 unit uCollisions; |
21 unit uCollisions; |
22 interface |
22 interface |
23 uses uFloat, uTypes; |
23 uses uFloat, uTypes, uUtils; |
24 |
24 |
25 const cMaxGearArrayInd = 1023; |
25 const cMaxGearArrayInd = 1023; |
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26 const cMaxGearHitOrderInd = 1023; |
26 |
27 |
27 type PGearArray = ^TGearArray; |
28 type PGearArray = ^TGearArray; |
28 TGearArray = record |
29 TGearArray = record |
29 ar: array[0..cMaxGearArrayInd] of PGear; |
30 ar: array[0..cMaxGearArrayInd] of PGear; |
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31 cX: array[0..cMaxGearArrayInd] of LongInt; |
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32 cY: array[0..cMaxGearArrayInd] of LongInt; |
30 Count: Longword |
33 Count: Longword |
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34 end; |
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35 |
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36 type PGearHitOrder = ^TGearHitOrder; |
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37 TGearHitOrder = record |
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38 ar: array[0..cMaxGearHitOrderInd] of PGear; |
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39 order: array[0..cMaxGearHitOrderInd] of LongInt; |
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40 Count: Longword |
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41 end; |
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42 |
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43 type TLineCollision = record |
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44 hasCollision: Boolean; |
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45 cX, cY: LongInt; //for visual effects only |
31 end; |
46 end; |
32 |
47 |
33 procedure initModule; |
48 procedure initModule; |
34 procedure freeModule; |
49 procedure freeModule; |
35 |
50 |
36 procedure AddCI(Gear: PGear); |
51 procedure AddCI(Gear: PGear); |
37 procedure DeleteCI(Gear: PGear); |
52 procedure DeleteCI(Gear: PGear); |
38 |
53 |
39 function CheckGearsCollision(Gear: PGear): PGearArray; |
54 function CheckGearsCollision(Gear: PGear): PGearArray; |
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55 function CheckAllGearsCollision(SourceGear: PGear): PGearArray; |
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56 |
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57 function CheckGearsLineCollision(Gear: PGear; oX, oY, tX, tY: hwFloat): PGearArray; |
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58 function CheckAllGearsLineCollision(SourceGear: PGear; oX, oY, tX, tY: hwFloat): PGearArray; |
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59 |
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60 function UpdateHitOrder(Gear: PGear; Order: LongInt): boolean; |
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61 procedure ClearHitOrderLeq(MinOrder: LongInt); |
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62 procedure ClearHitOrder(); |
40 |
63 |
41 function TestCollisionXwithGear(Gear: PGear; Dir: LongInt): Word; |
64 function TestCollisionXwithGear(Gear: PGear; Dir: LongInt): Word; |
42 function TestCollisionYwithGear(Gear: PGear; Dir: LongInt): Word; |
65 function TestCollisionYwithGear(Gear: PGear; Dir: LongInt): Word; |
43 |
66 |
44 function TestCollisionXKick(Gear: PGear; Dir: LongInt): Word; |
67 function TestCollisionXKick(Gear: PGear; Dir: LongInt): Word; |
128 with cinfos[i] do |
152 with cinfos[i] do |
129 if (Gear <> cGear) and |
153 if (Gear <> cGear) and |
130 (sqr(mx - x) + sqr(my - y) <= sqr(Radius + tr)) then |
154 (sqr(mx - x) + sqr(my - y) <= sqr(Radius + tr)) then |
131 begin |
155 begin |
132 ga.ar[ga.Count]:= cinfos[i].cGear; |
156 ga.ar[ga.Count]:= cinfos[i].cGear; |
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157 ga.cX[ga.Count]:= hwround(Gear^.X); |
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158 ga.cY[ga.Count]:= hwround(Gear^.Y); |
133 inc(ga.Count) |
159 inc(ga.Count) |
134 end |
160 end |
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161 end; |
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162 |
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163 function CheckAllGearsCollision(SourceGear: PGear): PGearArray; |
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164 var mx, my, tr: LongInt; |
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165 Gear: PGear; |
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166 begin |
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167 CheckAllGearsCollision:= @ga; |
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168 ga.Count:= 0; |
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169 |
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170 mx:= hwRound(SourceGear^.X); |
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171 my:= hwRound(SourceGear^.Y); |
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172 |
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173 tr:= SourceGear^.Radius + 2; |
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174 |
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175 Gear:= GearsList; |
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176 |
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177 while Gear <> nil do |
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178 begin |
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179 if (Gear <> SourceGear) and |
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180 (sqr(mx - hwRound(Gear^.x)) + sqr(my - hwRound(Gear^.y)) <= sqr(Gear^.Radius + tr))then |
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181 begin |
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182 ga.ar[ga.Count]:= Gear; |
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183 ga.cX[ga.Count]:= hwround(SourceGear^.X); |
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184 ga.cY[ga.Count]:= hwround(SourceGear^.Y); |
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185 inc(ga.Count) |
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186 end; |
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187 |
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188 Gear := Gear^.NextGear |
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189 end; |
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190 end; |
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191 |
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192 function LineCollisionTest(oX, oY, dirX, dirY, dirNormSqr, dirNormBound: hwFloat; |
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193 width: LongInt; Gear: PGear): |
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194 TLineCollision; inline; |
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195 var toCenterX, toCenterY, r, |
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196 b, bSqr, c, desc, t: hwFloat; |
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197 realT: extended; |
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198 begin |
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199 LineCollisionTest.hasCollision:= false; |
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200 toCenterX:= (oX - Gear^.X); |
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201 toCenterY:= (oY - Gear^.Y); |
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202 r:= int2hwFloat(Gear^.Radius + width + 2); |
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203 // Early cull to avoid multiplying large numbers |
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204 if hwAbs(toCenterX) + hwAbs(toCenterY) > dirNormBound + r then |
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205 exit; |
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206 b:= dirX * toCenterX + dirY * toCenterY; |
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207 c:= hwSqr(toCenterX) + hwSqr(toCenterY) - hwSqr(r); |
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208 if (b > _0) and (c > _0) then |
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209 exit; |
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210 bSqr:= hwSqr(b); |
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211 desc:= bSqr - dirNormSqr * c; |
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212 if desc.isNegative then exit; |
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213 |
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214 t:= -b - hwSqrt(desc); |
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215 if t.isNegative then t:= _0; |
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216 if t < dirNormSqr then |
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217 with LineCollisionTest do |
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218 begin |
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219 hasCollision:= true; |
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220 realT := hwFloat2Float(t) / hwFloat2Float(dirNormSqr); |
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221 cX:= round(hwFloat2Float(oX) + realT * hwFloat2Float(dirX)); |
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222 cY:= round(hwFloat2Float(oY) + realT * hwFloat2Float(dirY)); |
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223 end; |
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224 end; |
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225 |
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226 function CheckGearsLineCollision(Gear: PGear; oX, oY, tX, tY: hwFloat): PGearArray; |
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227 var dirX, dirY, dirNormSqr, dirNormBound: hwFloat; |
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228 test: TLineCollision; |
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229 i: Longword; |
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230 begin |
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231 CheckGearsLineCollision:= @ga; |
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232 ga.Count:= 0; |
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233 if Count = 0 then |
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234 exit; |
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235 dirX:= (tX - oX); |
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236 dirY:= (tY - oY); |
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237 dirNormBound:= _1_5 * (hwAbs(dirX) + hwAbs(dirY)); |
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238 dirNormSqr:= hwSqr(dirX) + hwSqr(dirY); |
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239 if dirNormSqr.isNegative then |
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240 exit; |
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241 |
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242 for i:= 0 to Pred(Count) do |
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243 with cinfos[i] do if Gear <> cGear then |
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244 begin |
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245 test:= LineCollisionTest( |
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246 oX, oY, dirX, dirY, dirNormSqr, dirNormBound, Gear^.Radius, cGear); |
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247 if test.hasCollision then |
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248 begin |
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249 ga.ar[ga.Count] := cGear; |
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250 ga.cX[ga.Count] := test.cX; |
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251 ga.cY[ga.Count] := test.cY; |
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252 inc(ga.Count) |
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253 end |
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254 end |
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255 end; |
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256 |
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257 function CheckAllGearsLineCollision(SourceGear: PGear; oX, oY, tX, tY: hwFloat): PGearArray; |
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258 var dirX, dirY, dirNormSqr, dirNormBound: hwFloat; |
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259 test: TLineCollision; |
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260 Gear: PGear; |
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261 begin |
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262 CheckAllGearsLineCollision:= @ga; |
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263 ga.Count:= 0; |
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264 dirX:= (tX - oX); |
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265 dirY:= (tY - oY); |
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266 dirNormBound:= _1_5 * (hwAbs(dirX) + hwAbs(dirY)); |
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267 dirNormSqr:= hwSqr(dirX) + hwSqr(dirY); |
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268 if dirNormSqr.isNegative then |
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269 exit; |
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270 |
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271 Gear:= GearsList; |
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272 while Gear <> nil do |
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273 begin |
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274 if SourceGear <> Gear then |
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275 begin |
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276 test:= LineCollisionTest( |
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277 oX, oY, dirX, dirY, dirNormSqr, dirNormBound, SourceGear^.Radius, Gear); |
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278 if test.hasCollision then |
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279 begin |
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280 ga.ar[ga.Count] := Gear; |
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281 ga.cX[ga.Count] := test.cX; |
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282 ga.cY[ga.Count] := test.cY; |
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283 inc(ga.Count) |
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284 end |
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285 end; |
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286 Gear := Gear^.NextGear |
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287 end; |
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288 end; |
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289 |
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290 function UpdateHitOrder(Gear: PGear; Order: LongInt): boolean; |
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291 var i: LongInt; |
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292 begin |
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293 UpdateHitOrder:= true; |
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294 for i:= 0 to ordera.Count - 1 do |
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295 if ordera.ar[i] = Gear then |
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296 begin |
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297 if Order <= ordera.order[i] then UpdateHitOrder:= false; |
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298 ordera.order[i]:= Max(ordera.order[i], order); |
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299 exit; |
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300 end; |
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301 |
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302 if ordera.Count > cMaxGearHitOrderInd then |
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303 UpdateHitOrder:= false |
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304 else |
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305 begin |
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306 ordera.ar[ordera.Count]:= Gear; |
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307 ordera.order[ordera.Count]:= Order; |
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308 Inc(ordera.Count); |
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309 end |
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310 end; |
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311 |
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312 procedure ClearHitOrderLeq(MinOrder: LongInt); |
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313 var i, freeIndex: LongInt; |
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314 begin; |
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315 freeIndex:= 0; |
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316 i:= 0; |
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317 |
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318 while i < ordera.Count do |
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319 begin |
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320 if ordera.order[i] <= MinOrder then |
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321 Dec(ordera.Count) |
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322 else |
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323 begin |
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324 if freeIndex < i then |
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325 begin |
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326 ordera.ar[freeIndex]:= ordera.ar[i]; |
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327 ordera.order[freeIndex]:= ordera.order[i]; |
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328 end; |
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329 Inc(freeIndex); |
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330 end; |
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331 Inc(i) |
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332 end |
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333 end; |
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334 |
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335 procedure ClearHitOrder(); |
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336 begin |
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337 ordera.Count:= 0; |
135 end; |
338 end; |
136 |
339 |
137 function TestCollisionXwithGear(Gear: PGear; Dir: LongInt): Word; |
340 function TestCollisionXwithGear(Gear: PGear; Dir: LongInt): Word; |
138 var x, y, i: LongInt; |
341 var x, y, i: LongInt; |
139 begin |
342 begin |