I'm asking for help for collisions! I can not understand how they work! I'll post my code that I hope help comes from some good
Posted on Tue, 2012-02-07 07:38
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 | require "sprite" local grabber = require("SpriteGrabber") local movieclip = require "movieclip" require 'physics' physics.start() physics.setGravity(0,0) local StickLib = require("lib_analog_stick") -- DISPLAY _W = display.contentWidth _H = display.contentHeight local screenW = display.contentWidth local screenH = display.contentHeight local Text = display.newText( " ", screenW*.6, screenH-20, native.systemFont, 15 ) -- HIDDEN STATUS BAR display.setStatusBar(display.HiddenStatusBar) --MULTITOUCH system.activate( "multitouch" ) -- Background local baseline = display.contentHeight/2 local sky = display.newImage("sky.jpg") local enemies = display.newGroup() -- BORDER local borderDown = display.newRect(0, baseline + 140 ,480, 100) borderDown:setFillColor(255,255,255,0) physics.addBody( borderDown, 'static',{bounce = 1, friction = 0}) local borderUp = display.newRect(0, -60,480, 90) borderUp:setFillColor(255,255,255,0) physics.addBody( borderUp, 'static',{bounce = 1, friction = 0}) local borderLeft = display.newRect(0, 0, 20, _H) borderLeft:setFillColor(255,255,255,0) physics.addBody( borderLeft, 'static',{bounce = 1, friction = 0}) local borderRight = display.newRect(_W - 20, 0, 20, _H) borderRight:setFillColor(255,255,255,0) physics.addBody( borderRight, 'static',{bounce = 1, friction = 0}) -- Scenes local ufo = {} ufo[1] = display.newImage("mountain_big.png") ufo[1].xScale = 1.7; ufo[1].yScale = 0.7 ufo[1]:setReferencePoint(display.BottomCenterReferencePoint) ufo[1].x = 50; ufo[1].y = baseline - 125 ufo[1].dx = 0.1 ufo[2] = display.newImage("mountain_small.png") ufo[2].xScale = 0.6; ufo[2].yScale = 0.6 ufo[2]:setReferencePoint(display.BottomCenterReferencePoint) ufo[2].x = 120; ufo[2].y = baseline + 100 ufo[2].dx = 0.2 ufo[3] = display.newImage("Bamboo-rgba.png") ufo[3].xScale = 0.4; ufo[3].yScale = 0.4 ufo[3]:setReferencePoint(display.BottomCenterReferencePoint) ufo[3].x = 480; ufo[3].y = baseline + 140 ufo[3].dx = 0.7 ufo[4] = display.newImage("mountain_small.png") ufo[4].xScale = 0.7; ufo[4].yScale = 0.7 ufo[4]:setReferencePoint(display.BottomCenterReferencePoint) ufo[4].x = 250; ufo[4].y = baseline + 100 ufo[4].dx = 0.4 ufo[5] = display.newImage("Palm-arecaceae.png") ufo[5].xScale = 0.7; ufo[4].yScale = 0.7 ufo[5]:setReferencePoint(display.BottomCenterReferencePoint) ufo[5].x = 180; ufo[4].y = baseline + 100 ufo[5].dx = 0.6 ufo[6] = display.newImage("Greenhouse-Palm-jubaea01.png") ufo[6].xScale = 0.7; ufo[4].yScale = 0.7 ufo[6]:setReferencePoint(display.BottomCenterReferencePoint) ufo[6].x = 290; ufo[4].y = baseline + 100 ufo[6].dx = 0.4 ufo[7] = display.newImage("Greenhouse-Palm-jubaea01.png") ufo[7].xScale = 0.8; ufo[4].yScale = 0.7 ufo[7]:setReferencePoint(display.BottomCenterReferencePoint) ufo[7].x = 210; ufo[4].y = baseline + 110 ufo[7].dx = 0.5 ufo[8] = display.newImage("Bamboo-rgba.png") ufo[8].xScale = 0.4; ufo[8].yScale = 0.4 ufo[8]:setReferencePoint(display.BottomCenterReferencePoint) ufo[8].x = 100; ufo[8].y = baseline + 150 ufo[8].dx = 0.7 -- MOUNTAIN local mountain_big = display.newImage("mountain_big.png", 132-150, 0) local mountain_sma = display.newImage("mountain_small.png",-10, 161) local mountain_big = display.newImage("mountain_big.png", 250, 40) local mountain_sma = display.newImage("mountain_small.png", 300, 135) local mountain_big = display.newImage("mountain_big.png",50,80) -- GRASS local grass = display.newImage( "grass.png" ) grass:setReferencePoint( display.CenterLeftReferencePoint ) grass.x = 0 grass.y = baseline + 150 local grass2 = display.newImage( "grass.png" ) grass2:setReferencePoint( display.CenterLeftReferencePoint ) grass2.x = 480 grass2.y = 300 --GROUND local ground = display.newRect( 0, baseline + 150, 480, 90 ) ground:setFillColor( 0x31, 0x5a, 0x18 ) local tPrevious = system.getTimer() local function move(event) local tDelta = event.time - tPrevious tPrevious = event.time local xOffset = ( 0.4 * tDelta ) grass.x = grass.x - xOffset grass2.x = grass2.x - xOffset if (grass.x + grass.stageWidth) < 0 then grass:translate( 480 * 2, 0) end if (grass2.x + grass2.stageWidth) < 0 then grass2:translate( 480 * 2, 0) end local i for i = 1, #ufo, 1 do ufo[i].x = ufo[i].x - ufo[i].dx * tDelta * 0.2 if (ufo[i].x + ufo[i].stageWidth) < 0 then ufo[i]:translate( 480 + ufo[i].stageWidth * 2, 0 ) end end end -- Start everything moving Runtime:addEventListener( "enterFrame", move ); -- PLAYER local player = display.newImage("goku1.png") player.name = 'player' player.x = screenW* .2 player.y = screenH* .5 physics.addBody(player,'dynamic',{bounce = 0}) -- RECTANGLE FOR SHOOT local rect = display.newRect(_W/2 + 93,_H/2,_W/2+ 150, _H/2) rect:setFillColor(255,255,255, 30) --Joystick/Player Movement MyStick = StickLib.NewStick( { x = screenW*.1, y = screenH*.85, thumbSize = 16, borderSize = 32, snapBackSpeed = .75, R = 255, G = 255, B = 255 } ) MyStick2 = StickLib.NewStick( { --x = screenW*.1, --y = screenH*.85, x = 550, y = 850, --Thumb size is inner circle, border size is outer circle thumbSize = 40, borderSize = 64, snapBackSpeed = .75, R = 255, G = 0, B = 0 } ) local function main( event ) -- MOVE THE PLAYER MyStick:move(player, 10.0, false) MyStick2:move(player, 7.0, true) -- SHOW STICK INFO Text.text = "ANGLE = "..MyStick:getAngle().." DISTANCE = "..math.ceil(MyStick:getDistance()).." PERCENT = "..math.ceil(MyStick:getPercent()*100).."%" end Runtime:addEventListener( "enterFrame", main ) -- SHOOT BULLET WITH TRANSITION local onBullet = function( self, event ) bullet = display.newImage('bullet.png') bullet.x = player.x + bullet.contentWidth bullet.y = player.y + 5 physics.addBody(bullet,{isSensore = true, isBullet = true}) transition.to(bullet, {x = player.x + 1200, y = player.y, time = 3000}) bullet.collision = onCollision; -- If a collision is detected, fire the function onCollision. bullet:addEventListenr( "collision", bullet ); end rect:addEventListener('tap', onBullet) -- MY ENEMY SPRITE SHEET local enemyTable = {} local i = 0 local function foo(event) if event.phase == "ended" then print(event.target.name) end if event.target.name == "name is: 3" then event.target:removeEventListener("touch", foo) print("you can add another listener here now") end end local function spawn_enemies() i=i+1 enemyTable[i] = movieclip.newAnim{ "e1.png", "e2.png", "e3.png", "e4.png", "e5.png", "e6.png" } enemyTable[i].x = math.random(390,400) enemyTable[i].y = math.random(1,350) enemyTable[i]:play{ startFrame=1, endFrame=6, loop=0, remove=false } physics.addBody(enemyTable[i],'dynamic', {isSensor= true, rotation = false, bounce = 0}) enemyTable[i]:setLinearVelocity(-100,0) enemyTable[i].name = "name is: "..i enemyTable[i]:addEventListener("touch", foo) for i,v in pairs(enemyTable) do print(i,v) end end timer.performWithDelay(500, spawn_enemies, 5) local onBulletCollision = function( self, event ) if event.phase == "began" and event.other.myName =="bullet" then enemyTable[i].isVisible = false enemyTable[i]:removeSelf() enemyTableSet:dispose() levelGroup:remove(enemyTable[i]) Runtime:removeEventListener("enterFrame", movesprite) end end <lua> |
Replies
Posted on Wed, 2012-02-08 02:11
#2
Sorry if I was not well explained! So my problem is that the bullet and the enemy, passing one above the other without any collision.
Also the bullet and the enemy will not automatically remove! help me!
I read on the forum of CORONA, that it is recommended to set the physical properties of (isSensor = true) to be the best collision ... help!
Posted on Wed, 2012-02-08 08:46
#3
Ok, let's look at the collision first and once that is working, you can tackle the automatic removal.
The "isSensor = true" will still register that a collision has taken place, but will not effect the objects movement/velocity etc.
if isSensor = true, objects pass through each other, (but Corona still registers the collision)
if isSensor = false, the objects will collide and bounce off each other.
For starters, try setting up a really basic program, where you fire a bullet object at a player object.
sometimes collisions will fail to register because the bullet is moving faster than the collision checks your program is doing.
try setting the bullet objects to object:isBullet = true. That may help.
Another possible issue is that the player and bullet objects are in different groups. Collisions wont register between objects in different groups.
Again, I think the best thing to do is write a simple program to get collisions working, then once you've got it figured out or isolated the problem, it'll be easier to identify a suitable solution. I'm sorry, but I just don't have time to read a large program, especially if it's not plug and play code.
Hope the suggestions help.
Spider.
Posted on Mon, 2012-02-13 03:45
#4
I place to you the link where you can find my game, please help me .. I would like to understand how these damn collisions happen!
Posted on Mon, 2012-02-13 04:15
#5
Hey.
That's not looking too bad so far.
I've taken a very quick look at your code. The first thing you need to do is stop the errors printing to the simulator. find every instance of *.stagewidth and replace it with *.contentWidth
Your program will function exactly the same, but you'll be able to see what's going on.
Having done that, you'll see there's an error in your bullet collision listener on line 229. I haven't had time to work out what the problem is yet as have to go to work now.
Try and resolve that and get a collision to print to the simulator whenever it is detected.
Also, in your question, you still don't post what you're having trouble with? bullets hitting trees/enemies. Player character hitting enemies? What are you trying to acheive?
Thanks
Spider
Posted on Mon, 2012-02-13 04:34
#6
the problem is that the bullet passes through the enemy without hitting him.
Also the enemy does not remove self! thanks
Posted on Mon, 2012-02-13 06:34
#7
I am maybe blind, but i cant see that you are referencing the right function for the collision?
Joakim
Posted on Mon, 2012-02-13 06:38
#8
Hmm, I was on the phone before and now I am looking at the code on my computer.
Wouldn't bullet:addEventListenr( "collision", bullet ) be
bullet:addEventListenr( "collision", onBulletCollision )???
Joakim
EDIT: It is also misspelled in the code, bullet:addEventListenr should be bullet:addEventListener
Posted on Tue, 2012-02-14 01:51
#9
hello, thanks for your warning, but I had already noticed this error, but changing this does not happen the collision! I'm desperate, I'm trying to understand these damn collisions for a month! HELP!
Posted on Tue, 2012-02-14 02:00
#10
Valerio, I don't want to appear mean or anything, but it took me no time to clear the simulator of *.stagewidth errors. Once they were gone, the simulator clearly indicated that the error is on line 229. jkrassman then kindly wrote out the correct code and corrected syntax errors.
If it still isn't working, you need to post what error messages you are getting? what code are you working with now? Has anything changed since the last code? Have you got it to print "works" to the simulator when a collision is detected, (so you can actually monitor if the event is firing?)
There are loads of people who will be happy to help you on the forums, but you must be more precise. We can't correct the problem if we don't know what error messages you get and what code you are using.
Thanks
Spider.
Posted on Tue, 2012-02-14 02:14
#11
excuse me .. Yesterday, on your advice, I changed stageWidth with contentWidth and the simulator has stopped giving errors.
The cool thing about it is that gives me no error messages! For this reason, I can not seem to be accurate.
my problem is the collision between enemy / projectile, with the removal from the display of both ...
this does not happen even if the simulator does not report errors, the two objects you pass one over the other without touching.
Posted on Tue, 2012-02-14 02:21
#12
Remove all code in the function for collision and ad a print statement:
print("Collision");
If that doesn't work, theres something else...
Joakim
Hi
I can't see anything immediately wrong with your code, so not sure what to suggest.
Could you perhaps be a little more specific about exactly what the problem is? Are you getting error messages/objects passing through each other/a function not firing/collisions not registering etc?
One way I try to work around problems like this is to write a really basic, simpler program which isolates the problem you are having, and see if you can get that working. Sorry if that's something you already do.