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play.agc
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/*------------------------------------------------------------------------------*\
Galaga - Arcade game remake
Created by Stefan Wessels.
Copyright (c) 2017 Wessels Consulting Ltd. All rights reserved.
This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it freely.
\*------------------------------------------------------------------------------*/
//------------------------------------------------------------------------------
function CleanupEffects()
done as integer[]
for i = 0 to gRunningEffects.length
dec gRunningEffects[i].ttl#, gDT#
if gRunningEffects[i].ttl# < 0
SetSpriteVisible(gRunningEffects[i].spr, 0)
done.insert(i)
endif
next i
done.sort()
for i = done.length to 0 step -1
gRunningEffects.remove(done[i])
next i
endfunction
//------------------------------------------------------------------------------
function RunBeamAction(enemy ref as Object)
sprite = gSprites[gSpriteOffsets[IMAGE_BEAM]]
select gMakeBeam
// 2 - Position/Show beam
case BEAM_POSITION:
SetSpritePositionByOffset(sprite, enemy.x#, enemy.y#+18.0)
gBeamSize#[0] = GetSpriteX(sprite)
gBeamSize#[1] = GetSpriteY(sprite)
gBeamSize#[2] = gBeamSize#[0] + GetSpriteWidth(sprite)
gBeamSize#[3] = gBeamSize#[1] + 0.1
gBeamSize#[4] = gBeamSize#[1] + GetSpriteHeight(sprite)
SetSpriteScissor(sprite, gBeamSize#[0], gBeamSize#[1], gBeamSize#[2], gBeamSize#[3])
SetSpriteVisible(sprite, 1)
inc gMakeBeam
endcase
// 3 - Open up the beam
case BEAM_OPENING:
inc gBeamSize#[3], cBeamOpenSpeed
if gBeamSize#[3] >= gBeamSize#[4]
inc gMakeBeam
gBeamSize#[3] = gBeamSize#[4]
enemy.timer# = cBeamHoldDuration
endif
SetSpriteScissor(sprite, gBeamSize#[0], gBeamSize#[1], gBeamSize#[2], gBeamSize#[3])
endcase
// 4 - Hold beam open
case BEAM_HOLD:
dec enemy.timer#, gDT#
if gCapture or enemy.timer# < 0.0 then inc gMakeBeam
endcase
// 5 - Close beam down
case BEAM_CLOSING:
dec gBeamSize#[3], cBeamOpenSpeed
if gBeamSize#[3] <= gBeamSize#[1] + 0.1
SetSpriteVisible(sprite, 0)
enemy.dy# = 103.0 - enemy.y#
//enemy.nextPlan = PLAN_GOTO_GRID
enemy.plan = PLAN_DIVE_ATTACK
SetupEnemyVelocityAndRotation(enemy)
gMakeBeam = 0
else
SetSpriteScissor(sprite, gBeamSize#[0], gBeamSize#[1], gBeamSize#[2], gBeamSize#[3])
endif
endcase
endselect
// Make the collision box the size of the beam at this stage
hc# = (gBeamSize#[3] - gBeamSize#[1])
SetSpriteShapeBox(sprite, -GetSpriteOffsetX(sprite), -GetSpriteOffsetY(sprite), GetSpriteWidth(sprite)/2.0, -GetSpriteOffsetY(sprite) + hc#, 0)
if gMakeBeam >= BEAM_OPENING and GetSpriteCollision(sprite, gPlayers[gCurrentPlayer].ships[0].spr)
gCapture = CAPTURE_PLAYER_TOUCHED
endif
endfunction
//------------------------------------------------------------------------------
function AddAttacker(index, position)
for i = index to gAttackers.length
if gAttackers[i] = -1
gAttackers[i] = position
//gEnemies[gCurrentPlayer, position].attackIndex = i
inc gNumAttackers
// exit j loop as a slot was found
exit
endif
next i
endfunction
//------------------------------------------------------------------------------
function HandleCapture()
preR# = gPlayers[gCurrentPlayer].ships[0].r#
if gCapture <= CAPTURE_PLAYER_SPIN
inc gPlayers[gCurrentPlayer].ships[0].r#, cCaptureSpinSpeed * gDT#
SetSpriteAngle(gPlayers[gCurrentPlayer].ships[0].spr, gPlayers[gCurrentPlayer].ships[0].r#+90)
// Normalize the angle
gPlayers[gCurrentPlayer].ships[0].r# = GetSpriteAngle(gPlayers[gCurrentPlayer].ships[0].spr)-90
endif
select gCapture
case CAPTURE_PLAYER_TOUCHED:
beamX# = GetSpriteXByOffset(gSprites[gSpriteOffsets[IMAGE_BEAM]])
offsetX# = GetSpriteXByOffset(gPlayers[gCurrentPlayer].ships[0].spr)
if offsetX# - 1.0 < beamX#
inc offsetX#, cPlayerCaptureSpeed * gDT#
elseif offsetX# + 1.0 > beamX#
dec offsetX#, cPlayerCaptureSpeed * gDT#
else
offsetX# = beamX#
endif
gPlayers[gCurrentPlayer].ships[0].x# = offsetX# - GetSpriteOffsetX(gPlayers[gCurrentPlayer].ships[0].spr)
if gPlayers[gCurrentPlayer].ships[0].y# > 70.0
dec gPlayers[gCurrentPlayer].ships[0].y#, cPlayerCaptureSpeed * gDT#
else
inc gCapture
endif
SetSpritePositionByOffset(gPlayers[gCurrentPlayer].ships[0].spr, offsetX#, gPlayers[gCurrentPlayer].ships[0].y#)
endcase
case CAPTURE_PLAYER_DISPLAY:
SetTextVisible(gText[TEXT_FIGHTER_CAPTURED], 1)
// TODO: Get the sound and add it to project and then this line
//PlaySound(gSounds[SOUND_CAPTURE_PLAYER))
gRotationCount# = 0.0
inc gCapture
endcase
case CAPTURE_PLAYER_SPIN:
inc gRotationCount#, cCaptureSpinSpeed * gDT#
if gRotationCount# >= 720.0 and (GetSpriteAngle(gPlayers[gCurrentPlayer].ships[0].spr)-90) - preR# < 0
gPlayers[gCurrentPlayer].ships[0].r# = 0.0
SetSpriteAngle(gPlayers[gCurrentPlayer].ships[0].spr, gPlayers[gCurrentPlayer].ships[0].r#)
gPlayers[gCurrentPlayer].ships[0].timer# = 1.0
inc gCapture
endif
endcase
case CAPTURE_PLAYER_HOLD:
dec gPlayers[gCurrentPlayer].ships[0].timer#, gDT#
if gPlayers[gCurrentPlayer].ships[0].timer# < 0.0
SetTextVisible(gText[TEXT_FIGHTER_CAPTURED], 0)
inc gCapture
endif
endcase
case CAPTURE_PLAYER_HOME:
// TODO: Fix the capture so it's a real capture
gPlayers[gCurrentPlayer].ships[0].y# = 91.0
SetSpritePosition(gPlayers[gCurrentPlayer].ships[0].spr, gPlayers[gCurrentPlayer].ships[0].x#, gPlayers[gCurrentPlayer].ships[0].y#)
// TODO: Hacked in but causes all kinds of grief - Fix this
// issues - stages don't tick over upon death; boss will still beam when there are 2 players.
gPlayers[gCurrentPlayer].ships[1].plan = PLAN_ALIVE
SetSpriteVisible(gPlayers[gCurrentPlayer].ships[1].spr,1)
gCapture = 0
endcase
endselect
endfunction
//------------------------------------------------------------------------------
function HandlePlayer()
// Flash the label for the player that's up
inc gFlashTimer#, gDT#
if gFlashTimer# >= cFlashTime
index = gText[gFlashIndex[gCurrentPlayer]]
SetTextVisible(index, 1-GetTextVisible(index))
gFlashTimer# = 0.0
endif
// if not a or not b then c will evaluate both a and b in AGK, even if a is false
if not gPlayers[gCurrentPlayer].ships[0].spr then exitFunction
if not GetSpriteVisible(gPlayers[gCurrentPlayer].ships[0].spr) then exitFunction
// if the player is being captured
if gCapture
HandleCapture()
else
// Handle direction input
if gDirection
if gPlayers[gCurrentPlayer].ships[0].plan && PLAN_ALIVE
newx# = gPlayers[gCurrentPlayer].ships[0].x#
if gPlayers[gCurrentPlayer].ships[1].plan && PLAN_ALIVE
width# = GetSpriteWidth(gPlayers[gCurrentPlayer].ships[1].spr)
else
width# = 0
endif
inc newx#, gDirection * cPlayerMovementSpeed * gDT#
offsetX# = GetSpriteOffsetX(gPlayers[gCurrentPlayer].ships[0].spr)
if newx# - offsetX# < 0
newx# = offsetX#
elseif newx# + offsetX# >= 100.0 - width#
newx# = 100.0 - width# - offsetX#
endif
gPlayers[gCurrentPlayer].ships[0].x# = newx#
SetSpritePositionByOffset(gPlayers[gCurrentPlayer].ships[0].spr, newx#, gPlayers[gCurrentPlayer].ships[0].y#)
if gPlayers[gCurrentPlayer].ships[1].plan = PLAN_ALIVE
gPlayers[gCurrentPlayer].ships[1].x# = newx# + width#
SetSpritePositionByOffset(gPlayers[gCurrentPlayer].ships[1].spr, gPlayers[gCurrentPlayer].ships[1].x#, gPlayers[gCurrentPlayer].ships[1].y#)
endif
endif
endif
endif
// don't allow firing before play starts
if gSubState < cPSPlay then exitFunction
// Fire if not 2 bullets/ship onscreen already
if gFire
if not gBullets[0].plan
bpointIndex = 0
elseif not gBullets[1].plan
bpointIndex = 1
else
bpointIndex = -1
endif
if bpointIndex >= 0
inc gPlayers[gCurrentPlayer].shotsFired
PlaySound(gSounds[SOUND_PLAYER_SHOOT])
sprite = gBullets[bpointIndex].spr
gBullets[bpointIndex].plan = PLAN_ALIVE
gBullets[bpointIndex].x# = gPlayers[gCurrentPlayer].ships[0].x# - (GetSpriteOffsetX(sprite)/2.0)
gBullets[bpointIndex].y# = gPlayers[gCurrentPlayer].ships[0].y#
SetSpritePositionByOffset(sprite, gBullets[bpointIndex].x#, gBullets[bpointIndex].y#)
SetSpriteVisible(sprite, 1)
if gPlayers[gCurrentPlayer].ships[1].plan = PLAN_ALIVE
inc gPlayers[gCurrentPlayer].shotsFired
inc bpointIndex, 2
sprite = gBullets[bpointIndex].spr
gBullets[bpointIndex].plan = PLAN_ALIVE
gBullets[bpointIndex].x# = gBullets[bpointIndex-2].x# + GetSpriteWidth(gPlayers[gCurrentPlayer].ships[0].spr)
gBullets[bpointIndex].y# = gBullets[bpointIndex-2].y#
SetSpritePositionByOffset(sprite, gBullets[bpointIndex].x#, gBullets[bpointIndex].y#)
SetSpriteVisible(sprite, 1)
endif
endif
endif
endfunction
//------------------------------------------------------------------------------
function EnemyFireAShot(enemy ref as Object)
if gBullets[gBulletIndex].plan = PLAN_DEAD
gBullets[gBulletIndex].plan = PLAN_ALIVE
gBullets[gBulletIndex].x# = enemy.x#
gBullets[gBulletIndex].y# = enemy.y#
dx# = enemy.x# - gPlayers[gCurrentPlayer].ships[0].x#
dy# = enemy.y# - gPlayers[gCurrentPlayer].ships[0].y#
// Limit the vertical "slide" of the bullets. This is really
// tan(angle)*y but tan(45) = 1 so it reduces nicely
//Clamp(dy#, -dy#, dx#)
if dx# > -dy# then dx# = -dy#
if dx# < dy# then dx# = dy#
gBullets[gBulletIndex].distance# = sqrt(dx#^2 + dy#^2)
r# = atan2(dy#, dx#)
// the velocity along the vectors
gBullets[gBulletIndex].vx# = cBulletSpeedEnemy * cos(r#)
gBullets[gBulletIndex].vy# = cBulletSpeedEnemy * sin(r#)
gBullets[gBulletIndex].dx# = dx#
gBullets[gBulletIndex].dy# = dy#
SetSpritePositionByOffset(gBullets[gBulletIndex].spr, gBullets[gBulletIndex].x#, gBullets[gBulletIndex].y#)
SetSpriteVisible(gBullets[gBulletIndex].spr, 1)
inc gBulletIndex
if gBulletIndex >= cMaxBullets then gBulletIndex = gSpriteNumbers[IMAGE_BLUE_BULLET]
endif
endfunction
//------------------------------------------------------------------------------
function MoveBullets()
for i = 0 to cMaxBullets
if gBullets[i].plan = PLAN_ALIVE
sprite = gBullets[i].spr
if i < gSpriteNumbers[IMAGE_BLUE_BULLET]
// TODO: Player bullets only travvel in astraight line but
// when the player is being beamed, the bullets can go at an
// angle - add support for that
dec gBullets[i].y#, cBulletSpeed * gDT#
if(gBullets[i].y# < (1/cOriginalYCellsF)*100.0)
gBullets[i].plan = PLAN_DEAD
SetSpriteVisible(sprite, 0)
endif
else
tx# = gDT# * gBullets[i].vx#
ty# = gDT# * gBullets[i].vy#
// Update the position
dec gBullets[i].x#, tx#
dec gBullets[i].y#, ty#
if(gBullets[i].y# > ((cOriginalYCellsF-2)/cOriginalYCellsF)*100.0)
gBullets[i].plan = PLAN_DEAD
SetSpriteVisible(sprite, 0)
else
if gPlayers[gCurrentPlayer].ships[0].plan = PLAN_ALIVE and GetSpriteCollision(sprite, gPlayers[gCurrentPlayer].ships[0].spr)
KillPlayer(gPlayers[gCurrentPlayer].ships[0])
gBullets[i].plan = PLAN_DEAD
SetSpriteVisible(sprite, 0)
continue
endif
if gPlayers[gCurrentPlayer].ships[1].plan = PLAN_ALIVE
if GetSpriteCollision(gBullets[i].spr, gPlayers[gCurrentPlayer].ships[1].spr)
KillPlayer(gPlayers[gCurrentPlayer].ships[1])
gBullets[i].plan = PLAN_DEAD
SetSpriteVisible(sprite, 0)
elseif gPlayers[gCurrentPlayer].ships[0].plan = PLAN_DEAD
// if player 1 is alive and 0 dead, assign 1 to 0 so 0 is always the 1 that's alive
gPlayers[gCurrentPlayer].ships[0] = gPlayers[gCurrentPlayer].ships[1]
gPlayers[gCurrentPlayer].ships[1].plan = PLAN_DEAD
endif
endif
endif
endif
SetSpritePositionByOffset(sprite, gBullets[i].x#, gBullets[i].y#)
endif
next i
endfunction
//------------------------------------------------------------------------------
function IncrementScore(byValue as integer)
oldScore = gPlayers[gCurrentPlayer].score
newScore = oldScore + byValue
// under 1M points, give life at 20k and every 70k
if newScore < 1000000
if oldScore < 20000 and newScore >= 20000 or (oldScore / 70000) < (newScore / 70000)
inc gPlayers[gCurrentPlayer].lives
ShowLivesIcons()
// TODO - Play the sound for extra life here
endif
endif
gPlayers[gCurrentPlayer].score = newScore
SetTextString(gText[gScoreIndex[gCurrentPlayer]], FormatValue(gPlayers[gCurrentPlayer].score))
if gPlayers[gCurrentPlayer].score > gHighScores[0].score
SetTextString(gText[TEXT_20000], FormatValue(gPlayers[gCurrentPlayer].score))
endif
endfunction
//------------------------------------------------------------------------------
function KillPlayer(player ref as Object)
player.plan = PLAN_DEAD
PlaySound(gSounds[SOUND_PLAYER_DIE])
// Hide the player ship
SetSpriteVisible(player.spr, 0)
// Stop the StarField
gStarSpeed# = 0.0
// Play an explosion
sprite = gSprites[gSpriteOffsets[IMAGE_PLAYER_EXPLOSION]]
SetSpritePositionByOffset(sprite, player.x#, player.y#)
SetSpriteVisible(sprite, 1)
PlaySprite(sprite, cPlayerExplosionFPS, 0)
// Add explosion to effects lidt for cleanup
effect as TypeStar
effect.spr = sprite
effect.ttl# = gSpriteAnimFrames[IMAGE_PLAYER_EXPLOSION] * (1.0/(cPlayerExplosionFPS-1))
gRunningEffects.Insert(effect)
SetSpriteVisible(player.spr, 0)
endfunction
//------------------------------------------------------------------------------
function KillEnemy(enemy ref as Object)
// Kill the enemy
SetSpriteVisible(enemy.spr, 0)
inc gEnemiesKilledThisStage
inc gPlayers[gCurrentPlayer].hits
dec gPlayers[gCurrentPlayer].enemiesAlive
kind = enemy.isa
// TODO: Make sure the beam can just disappear - this may need
// to be fixed so the beam retracts when the enemy dies
if enemy.plan = PLAN_BEAM_ACTION
SetSpriteVisible(gSprites[gSpriteOffsets[IMAGE_BEAM]], 0)
gMakebeam = BEAM_OFF
endif
enemy.plan = PLAN_DEAD
PlaySound(gSounds[gKillSound[kind]])
// Standing in grid gives one score, flying another
if enemy.plan = PLAN_GRID
IncrementScore(gScoreSheet[0, kind])
else
IncrementScore(gScoreSheet[1, kind])
endif
// If on an attack run, take it off
if enemy.attackIndex >= 0
gAttackers[enemy.attackIndex] = -1
dec gNumAttackers
endif
// Play an explosion
sprite = gSprites[gSpriteOffsets[IMAGE_EXPLOSION]+gNextExplosion]
inc gNextExplosion
if gNextExplosion = gSpriteNumbers[IMAGE_EXPLOSION] then gNextExplosion = 0
SetSpritePositionByOffset(sprite, enemy.x#, enemy.y#)
SetSpriteVisible(sprite, 1)
PlaySprite(sprite, cEnemyExplosionFPS, 0)
// Add explosion to effects list for cleanup
effect as TypeStar
effect.spr = sprite
effect.ttl# = gSpriteAnimFrames[IMAGE_EXPLOSION] * (1.0/cEnemyExplosionFPS)
gRunningEffects.Insert(effect)
endfunction
//------------------------------------------------------------------------------
function CheckEnemyDead(enemy ref as Object)
// Check if enemy was shot
for j = 0 to 3
if gBullets[j].plan = PLAN_ALIVE
if GetSpriteCollision(enemy.spr, gBullets[j].spr)
gBullets[j].plan = PLAN_DEAD
SetSpriteVisible(gBullets[j].spr, 0)
// Green Commanders become blue, they don't die yet
if enemy.isa = IMAGE_BOSS_GREEN
// Hide the green
SetSpriteVisible(enemy.spr, 0)
enemy.isa = IMAGE_BOSS_BLUE
// enable the blue
enemy.spr = gSprites[gSpriteOffsets[IMAGE_BOSS_BLUE]+gSpritesUsed[gCurrentPlayer, IMAGE_BOSS_BLUE]]
inc gSpritesUsed[gCurrentPlayer, IMAGE_BOSS_BLUE]
SetSpritePositionByOffset(enemy.spr, enemy.x#, enemy.y#)
SetSpriteAngle(enemy.spr, enemy.r#)
SetSpriteVisible(enemy.spr, 1)
PlaySound(gSounds[SOUND_HIT_BOSS_GREEN])
else
KillEnemy(enemy)
endif
// Don't check other bullets, this enemy is dead
exitFunction
endif
endif
next j
// Check for a collision with the player if not on a spawn path - on a spawn path doesn't collide with the player
if not (gPlayers[gCurrentPlayer].spawnActive or gCapture)
if gPlayers[gCurrentPlayer].ships[0].plan = PLAN_ALIVE and GetSpriteCollision(enemy.spr, gPlayers[gCurrentPlayer].ships[0].spr)
KillEnemy(enemy)
KillPlayer(gPlayers[gCurrentPlayer].ships[0])
endif
if gPlayers[gCurrentPlayer].ships[1].plan = PLAN_ALIVE and GetSpriteCollision(enemy.spr, gPlayers[gCurrentPlayer].ships[1].spr)
KillEnemy(enemy)
KillPlayer(gPlayers[gCurrentPlayer].ships[1])
endif
endif
endfunction
//------------------------------------------------------------------------------
function SetupEnemyVelocityAndRotation(enemy ref as Object)
// waves come in at the same velocity but attacks speed up
if not gBugsAttack
speed# = cBugTravelSpeed
else
speed# = gBugAttackSpeed#
endif
// larger circles require higer velocity to come out shoulder to shoulder with the smaller
// inner circles
if enemy.plan = PLAN_PATH
index = enemy.pathIndex >> 1
if index = aPath_Bottom_Double_Out
if enemy.pointIndex > 4 then speed# = speed# * 1.625 else speed# = speed# * 1.1
elseif index = aPath_Top_Double_Left
if enemy.pointIndex > 4 then speed# = speed# * 1.625
endif
endif
// How fat to travel and at what angle
enemy.distance# = sqrt(enemy.dx#^2 + enemy.dy#^2)
r# = atan2(enemy.dy#, enemy.dx#)
// set the enemy rotation only if it's not about to land in the grid and is not in the grid.
// That's because the grid causes left/right motion that leads to extreme rotation which
// this ignores
if enemy.plan < PLAN_ORIENT or enemy.plan > PLAN_GRID
// if the enemy is about to land in the grid, don't change its angle as that looks bad
if not (abs(enemy.dy#) < 3.0 and enemy.plan = PLAN_GOTO_GRID) then enemy.r# = 90 + r#
endif
// the velocity along the vectors
enemy.vx# = speed# * cos(r#)
enemy.vy# = speed# * sin(r#)
// point the sprite at the desired direction
SetSpriteAngle(enemy.spr, enemy.r#)
endfunction
//------------------------------------------------------------------------------
function GetGridCoordinate(enemy ref as Object)
col = gGridCols[enemy.positionIndex]
row = gGridRows[enemy.positionIndex]
// add an offset for breathing or left-right walking
if gPlayers[gCurrentPlayer].gridBreathing
breatheX# = 1.418 * gPlayers[gCurrentPlayer].gridTimer#
breatheY# = 0.675 * gPlayers[gCurrentPlayer].gridTimer#
// these "magic numbers" are calculated. For example:
// 10 bees wide is cols 0-9. 9 * 6.7 = 60.3
// 100% - 60.3% / 2 = 19.85 - that's the "left edge"
nx# = 19.85 + (col * 6.7) + (col-5)*BreatheX#
ny# = 15.25 + (row * 4.2) + (row+1)*BreatheY#
else
// 19.85 / 2 = 9.925
walkX# = 9.925 * gPlayers[gCurrentPlayer].gridTimer#
nx# = (col * 6.7) + walkX#
ny# = 15.25 + (row * 4.2)
endif
// The non-commanders are another 1.6% down from the commanders
if row then inc ny#, 1.6
inc ny#, gPlayers[gCurrentPlayer].gridYOffset#
enemy.dx# = nx# - enemy.x#
enemy.dy# = ny# - enemy.y#
SetupEnemyVelocityAndRotation(enemy)
endfunction
//------------------------------------------------------------------------------
function NextPathPoint(enemy ref as Object)
index = enemy.pathIndex >> 1
enemy.dx# = gPathDataX[index, enemy.pointIndex]
enemy.dy# = gPathDataY[index, enemy.pointIndex]
// Odd paths are mirrored
if enemy.pathIndex && 1 then enemy.dx# = -enemy.dx#
SetupEnemyVelocityAndRotation(enemy)
endfunction
//------------------------------------------------------------------------------
function SetupFlutterArc(enemy ref as Object)
// save the current facing angle
r# = enemy.r# - 90.0
sign# = gMirror[enemy.positionIndex]
// Get the angle to the player
dx# = gPlayers[gCurrentPlayer].ships[0].x# - enemy.x#
// Figure out the flutter pattern (zig/zag/zag)
if enemy.y# < 65.0
dy# = 20.0
if sign# = 0
dx# = clamp(-80.0, -15.0, dx#)
else
dx# = clamp(15.0, 80.0, dx#)
endif
else
dy# = 15.0
if sign# = 0
dx# = clamp(15.0, 25.0, dx#)
else
dx# = clamp(-25.0, -15.0, dx#)
endif
endif
// angle to the destination
enemy.dr# = atan2(dy#, dx#)
// rate of turn (increment angle)
enemy.ir# = (enemy.dr# - r#) * 3.0
// distance to travel (as a line, not on the curve)
enemy.dx# = dx#
enemy.dy# = dy#
SetupEnemyVelocityAndRotation(enemy)
// Restore the sprite angle that was changed in SetupEnemyVelocityAndRotation
inc r#, 90.0
enemy.r# = r#
SetSpriteAngle(enemy.spr, r#)
endfunction
//------------------------------------------------------------------------------
function DecisionOnPostPath(enemy ref as Object)
// if just launched, set up to shoot, if not a peel-away
if enemy.positionIndex < 40
if enemy.pathIndex >> 1 = aPath_Launch
enemy.timer# = 0.3
enemy.shotsToFire = 1
endif
endif
// Install the nextPlan as the plan
enemy.plan = enemy.nextPlan
// Do some setup for the plan that follows completing a path
select enemy.plan
// TODO: - The DIVE_AWAY guys also have PLAN_PATH as the nextPath - Introduce a new state
case PLAN_PATH:
// Set enemy on an arc to face the bottom of the screen
if enemy.isa = IMAGE_BEE
enemy.pathIndex = PATH_BEE_ATTACK + gMirror[enemy.positionIndex]
enemy.nextPlan = PLAN_DESCEND
else
enemy.pathIndex = PATH_BUTTERFLY_ATTACK + gMirror[enemy.positionIndex]
enemy.nextPlan = PLAN_FLUTTER
endif
NextPathPoint(enemy)
endcase
// After the sweep, get to a height where the circle back starts.
// Need a seperate state because the bees in rows start at difefrent heights so can't make a path
// that goes down includes the half-circle arc
case PLAN_DESCEND:
// Just barely get a wing out the bottom of the screen
enemy.dx# = 0
enemy.dy# = 81.0 - enemy.y#
SetupEnemyVelocityAndRotation(enemy)
endcase
// after bottom circle, bee must decide to go home or make a full cirlce
case PLAN_HOME_OR_FULL_CIRCLE:
if gPlayers[gCurrentPlayer].enemiesAlive < 6 and gPlayers[gCurrentPlayer].ships[0].plan = PLAN_ALIVE
enemy.plan = PLAN_PATH
enemy.pathIndex = PATH_BEE_TOP_CIRCLE + 1-gMirror[enemy.positionIndex]
NextPathPoint(enemy)
// if full circle, afterwards dive out the bottom
enemy.nextPlan = PLAN_DIVE_ATTACK
else
// Half cirlce was enough, go home
enemy.plan = PLAN_GOTO_GRID
endif
endcase
// Calculate the flutter arc
case PLAN_FLUTTER:
SetupFlutterArc(enemy)
endcase
// Start an attack dive that ends with the enemy disappearing off the bottom
case PLAN_DIVE_AWAY_LAUNCH:
enemy.plan = PLAN_PATH
enemy.nextPlan = PLAN_DIVE_AWAY
enemy.pathIndex = PATH_LAUNCH + gMirror[enemy.positionIndex-36]
NextPathPoint(enemy)
endcase
// enemy has launched into the dive away, now set the destination and carry on
// At end, the enemy will simply disapopear (die)
case PLAN_DIVE_AWAY:
// Pick a point to dive at - a 20% range around the player
left = gPlayers[gCurrentPlayer].ships[0].x# - 10.0
right = gPlayers[gCurrentPlayer].ships[0].x# + 10.0
Clamp(10, 90, left)
Clamp(10, 90, right)
enemy.dx# = Random(left,right) - enemy.x#
enemy.dy# = 103.0 - enemy.y#
SetupEnemyVelocityAndRotation(enemy)
endcase
case PLAN_DIVE_ATTACK:
// Send it out the screen
enemy.dy# = 103.0 - enemy.y#
enemy.nextPlan = PLAN_GOTO_GRID
SetupEnemyVelocityAndRotation(enemy)
endcase
case PLAN_GOTO_BEAM:
enemy.dx# = gPlayers[gCurrentPlayer].ships[0].x# - enemy.x#
enemy.dy# = 62.0 - GetSpriteYByOffset(enemy.spr)
SetupEnemyVelocityAndRotation(enemy)
endcase
// This is used by the Challange stages
case PLAN_DEAD:
dec gPlayers[gCurrentPlayer].enemiesAlive
SetSpriteVisible(enemy.spr, 0)
endcase
endselect
endfunction
//------------------------------------------------------------------------------
function DecisionTime(enemy ref as Object)
select enemy.plan
// Reached the grid
case PLAN_GOTO_GRID:
if gPlayers[gCurrentPlayer].ships[0].plan = PLAN_ALIVE and not gPlayers[gCurrentPlayer].spawnActive and gPlayers[gCurrentPlayer].enemiesAlive < 5
// keep attacking straight away
// TODO - I think this is actually right at the top of the screen, not here at the grid level
enemy.plan = PLAN_PATH
if enemy.isa = IMAGE_BEE
enemy.pathIndex = PATH_BEE_ATTACK + gMirror[enemy.positionIndex]
enemy.nextPlan = PLAN_DESCEND
else
enemy.pathIndex = PATH_BUTTERFLY_ATTACK + gMirror[enemy.positionIndex]
enemy.nextPlan = PLAN_FLUTTER
endif
NextPathPoint(enemy)
else
// rotate into place
enemy.plan = PLAN_ORIENT
endif
endcase
// keep rotating till zero facing, then just be in the grid
case PLAN_ORIENT:
// Take out of attack mode when arriving in the grid
if enemy.attackIndex >= 0
gAttackers[enemy.attackIndex] = -1
dec gNumAttackers
enemy.attackIndex = -1
endif
if enemy.r# < -cGridOrientAngle
inc enemy.r#, cGridOrientAngle
elseif enemy.r# > cGridOrientAngle
dec enemy.r#, cGridOrientAngle
else
enemy.r# = 0.0
enemy.plan = PLAN_GRID
endif
endcase
// end of a point in the path, maybe the end of the path
case PLAN_PATH:
inc enemy.pointIndex
// go to next path point unless this was the last, then
// go to the next plan in DecisionOnPostPath
if enemy.pointIndex <= gPathDataX[enemy.pathIndex>>1].length
NextPathPoint(enemy)
else
enemy.pointIndex = 0
// Activate nextPlan and set up paramaters to run that plan
DecisionOnPostPath(enemy)
endif
endcase
// After descend, start the bototm half circle path
case PLAN_DESCEND:
enemy.plan = PLAN_PATH
enemy.pathIndex = PATH_BEE_BOTTOM_CIRCLE + gMirror[enemy.positionIndex]
NextPathPoint(enemy)
// Set up for deciding what to do at the end of that bottom circle
enemy.nextPlan = PLAN_HOME_OR_FULL_CIRCLE
endcase
case PLAN_FLUTTER:
if enemy.y# < 100.0
SetupFlutterArc(enemy)
else
enemy.plan = PLAN_DIVE_ATTACK
// TODO - Figure out a better answer to the dx# on a butterfly leaving
enemy.dx# = 0
enemy.dy# = 3.0
enemy.nextPlan = PLAN_GOTO_GRID
SetupEnemyVelocityAndRotation(enemy)
endif
endcase
// Out the bottom so go away
case PLAN_DIVE_AWAY
enemy.plan = PLAN_DEAD
dec gPlayers[gCurrentPlayer].enemiesAlive
SetSpriteVisible(enemy.spr, 0)
endcase
case PLAN_DIVE_ATTACK
enemy.plan = PLAN_GOTO_GRID
enemy.y# = 0.0
enemy.x# = gStartPathX[aPath_Top_Double_Right]
if not gMirror[enemy.positionIndex] then enemy.x# = 100.0 - enemy.x#
endcase
case PLAN_GOTO_BEAM:
enemy.r# = 90
SetSpriteAngle(enemy.spr, enemy.r#+90)
enemy.plan = PLAN_BEAM_ACTION
endcase
endselect
endfunction
//------------------------------------------------------------------------------
function UpdateEnemy(enemy ref as Object)
// Anything that moves means it's not all quiet
if enemy.plan <> PLAN_GRID then gQuiescence = 0
if enemy.plan = PLAN_BEAM_ACTION
RunBeamAction(enemy)
// while in beam state there's no movement
exitFunction
endif
// TODO - Give GetGridCoordinate it's own update because running it through here is a waste
// for grid (or grid-bound) enemies, call every frame as the next position keeps changing
if enemy.plan >= PLAN_GOTO_GRID and enemy.plan <= PLAN_GRID
GetGridCoordinate(enemy)
endif
// Calculate how much to move this frame in each axis
tx# = gDT# * enemy.vx#
ty# = gDT# * enemy.vy#
// figure out what that is along the vector
dist# = sqrt(tx#^2+ty#^2)
// Butterflies flutter on an ARC
if enemy.plan = PLAN_FLUTTER
// get the current angle
r# = enemy.r# - 90
// save the angle
ro# = r#
// adjust for the increment
inc r#, enemy.ir# * gDT#
// see if desired angle reached and stop changing
if (r# - ro#) * (enemy.dr# - ro#) < 0.0 then enemy.ir# = 0.0
// get the x/y step sizes
tx# = gDT# * gBugAttackSpeed# * cos(r#)
ty# = gDT# * gBugAttackSpeed# * sin(r#)
// set the facing angle in the Object and the sprite
enemy.r# = r#+90
SetSpriteAngle(enemy.spr, enemy.r#)
else
// See how far along the path, and clip to not overshoot
if dist# > enemy.distance#
tx# = enemy.dx#
ty# = enemy.dy#
endif
endif
// Updat the position
inc enemy.x#, tx#
inc enemy.y#, ty#
// update the distance to travel components
dec enemy.dx#, tx#
dec enemy.dy#, ty#
dec enemy.distance#, dist#
// If at the end of travel figure out what the plan should be
if enemy.plan <> PLAN_GRID and enemy.distance# <= 0.0
DecisionTime(enemy)
endif
// Let the enemy shoot if it needs to
if enemy.timer# > 0.0
dec enemy.timer#, gDT#
if enemy.timer# <= 0.0
if enemy.shotsToFire
EnemyFireAShot(enemy)
dec enemy.shotsToFire
if enemy.shotsToFire then enemy.timer# = cEnemyGunReloadTime
endif
endif
endif
// Put the enemy where it wants to go
SetSpritePositionByOffset(enemy.spr, enemy.x#, enemy.y#)
endfunction
//------------------------------------------------------------------------------
function UpdateGridOffsets()
// Breathe in-out
oldTimer# = gPlayers[gCurrentPlayer].gridTimer#
inc gPlayers[gCurrentPlayer].gridTimer#, gDT# * gPlayers[gCurrentPlayer].gridDir#
if gPlayers[gCurrentPlayer].gridTimer# >= gGridTime[gPlayers[gCurrentPlayer].gridBreathing] or gPlayers[gCurrentPlayer].gridTimer# <= 0.0
// At extets, flip direction
gPlayers[gCurrentPlayer].gridDir# = -gPlayers[gCurrentPlayer].gridDir#
// but step back into range so there's no chance of getting
// stuck outside the range on a smaller gDT# next frame
inc gPlayers[gCurrentPlayer].gridTimer#, gDT# * gPlayers[gCurrentPlayer].gridDir#
endif
// After walking left/right, activate breathing when the grid is in the middle
if not gPlayers[gCurrentPlayer].gridBreathing
if not gPlayers[gCurrentPlayer].spawnActive
middle# = (gGridTime[0] / 2.0)
s1# = middle# - oldTimer#
s2# = middle# - gPlayers[gCurrentPlayer].gridTimer#
// if this is < 0 the signs are not the same meaning the gris crossed just over the middle
if s1# * s2# < 0
gPlayers[gCurrentPlayer].gridBreathing = 1
gPlayers[gCurrentPlayer].gridTimer# = 0.0
gPlayers[gCurrentPlayer].gridDir# = 1.0
endif
endif
endif
endfunction
//------------------------------------------------------------------------------
function UpdateEnemies()
// The grid keeps moving
UpdateGridOffsets()
// Start by assuming the enemies are all standing in the grid
gQuiescence = 1
// TODO: Rename this variable
// Assume there are no active attackers on bombing runs
for i = 0 to cMaxEnemies
// if not dead, the enemy must be updated
if gEnemies[gCurrentPlayer, i].plan
UpdateEnemy(gEnemies[gCurrentPlayer, i])
// collide enemy against player and its bullets
CheckEnemyDead(gEnemies[gCurrentPlayer, i])
// count the enemies on bombing runs
plan = gEnemies[gCurrentPlayer, i].plan
endif
next i
endfunction
//------------------------------------------------------------------------------
function AttackReady()
// Can't attack while still spawning
if gPlayers[gCurrentPlayer].spawnActive then exitFunction(0)
// also wait for the waves to all make it to the grid
if not gQuiescence then exitFunction(0)
// prime the attack structure with 2 attackers, not bosses, hence start looking from 4
gNumAttackers = 0
for i = 0 to gAttackOrder.length
if gNumAttackers < 2
position = gAttackOrder[i]
if gEnemies[gCurrentPlayer, position].plan = PLAN_GRID
gAttackers[gNumAttackers] = position
inc gNumAttackers
endif
endif
next i
// mark unsed slots as such
for i = gNumAttackers to gAttackers.length
gAttackers[i] = -1
next i
endfunction(1)
//------------------------------------------------------------------------------
function ChooseAttacker()