Rotate to face direction

sionco

Hi, Im new here. I'm trying to create an overhead shooter.
A question, in my game I have loaded a tiled map (thanks to atilim's post) , and created a player image, which moves to wherever the mouse clicks. However, I'm unsure of how to get the players image to rotate to look in the direction of the target. What I have tried is below, it just makes him 'wobble'

local tilemap = TileMapMultiple.new("level1.lua")   stage:addChild(tilemap)   local qatan2 = math.atan2 local qsin = math.sin local qcos = math.cos local player1 = Bitmap.new(Texture.new("shooterRambo.png"))   player1:setAnchorPoint(0.5,0.5) player1:setRotation(0) player1.x = 100 player1.y = 100 player1.speed =1 player1.targetX = 100 player1.targetY = 100   stage:addChild(player1)   function onEnterFrame(event) local x = player1:getX() local y = player1:getY() y = y + (qsin(qatan2(player1.targetY - y, player1.targetX - x))*1); x = x + (qcos(qatan2(player1.targetY - y, player1.targetX - x))*1);   player1:setX(x) player1:setY(y) --This is what I have tried player1:setRotation(qatan2(player1.targetY - y, player1.targetX - x))   end   function onMouseDown(event) player1.targetX = event.x player1.targetY = event.y end   stage:addEventListener(Event.MOUSE_DOWN, onMouseDown) stage:addEventListener(Event.ENTER_FRAME, onEnterFrame)

Many thanks

evs

@sionco

You need...

player1:setRotation(qatan2(player1.targetY - y, player1.targetX - x) * 180 * 7 / 22)

cheers

evs

sionco

ah, ok thank you

sionco

Hi, I've been playing around with this and I just can't figure out how I would change this to move the map and not the player.
I've tried all sorts of things, and have had various results from the player and map moving to far in

I've tried this:
player1:setX(x)
player1:setY(y)
tilemap:setX(-x)
tilemap:setY(-y)
but it moves the map and player in each direction to far, I understand that I have to not change the players x and y, and keep him in the center of the screen, but I'm unsure of how.
I've also tried this;
player1:setX(application:getContentWidth()*0.5)
player1:setY(application:getContentHeight()*0.5)
tilemap:setX(-x)
tilemap:setY(-y)

but it doesn't really move the man.

any help would be gratefully appreciated, as I'm learning this new tool

techdojo

Your correct in that you want to "fix" your man in the centre of the screen, you then want to set the "camera" position so that your current "view" is in the correct place in the world.

Given the way the gideros tilemap stuff works when you set the tilemap to 0,0 it draws the top left corner of the map in the top left corner of the screen and adjusting the x to make it negative will "scroll" the map to the left, this seems a little counter intuitive as your tilemap x coord goes from 0 (extreme left) to -(world_width-screen_width) (extreme right) however it's fairly easy to create a mapping from a "world" coordinate system to a "screen" coordinate system.

It might be easier to post a simple example from your code and let us have a look

sionco

Hi, thanks for the response. I think I see the problem, in that I haven't got a camera.
I'll get searching for some examples.

anway here's my code

player1:setAnchorPoint(0.5,0.5) player1:setRotation(0) player1.x = 100 player1.y = 0 player1.speed =1 player1.targetX = 100 player1.targetY = 100   stage:addChild(player1)   function onEnterFrame(event) local x = player1:getX() local y = player1:getY() local mapX = tilemap:getX() local mapY = tilemap:getY()   mapY = mapY + (qsin(qatan2(player1.targetY - mapY, player1.targetX - mapX))*1); mapX = mapX + (qcos(qatan2(player1.targetY - mapY, player1.targetX - mapX))*1);   if x > player1.targetX - 2 and x < player1.targetX +2 and y > player1.targetY - 2 and y < player1.targetY +2 then x = player1.targetX y = player1.targetY else player1:setRotation(qatan2(player1.targetY - y, player1.targetX - x) * 180 * 7 / 22)   end if x > screenW-64 then offset = offset+1 end   player1:setX(application:getContentWidth()*0.5) player1:setY(application:getContentHeight()*0.5) tilemap:setX(mapX) tilemap:setY(mapY)     end   function onMouseDown(event) player1.targetX = event.x-offsetX player1.targetY = event.y-offsetY end   function onKeyDown(event)   end   stage:addEventListener(Event.MOUSE_DOWN, onMouseDown) stage:addEventListener(Event.ENTER_FRAME, onEnterFrame)

and the tilemapmultiple taken from
http://www.giderosmobile.com/forum/discussion/comment/5546#Comment_5546

TiledMap = Core.class(Sprite)   local map   function TiledMap:init(filename)   map = loadfile(filename)()   local tileset = map.tilesets[1] tileset.sizex = math.floor((tileset.imagewidth - tileset.margin + tileset.spacing) / (tileset.tilewidth + tileset.spacing)) tileset.sizey = math.floor((tileset.imageheight - tileset.margin + tileset.spacing) / (tileset.tileheight + tileset.spacing)) tileset.texture = Texture.new(tileset.image)   local layer = map.layers[1]   local tilemap = TileMap.new(layer.width, layer.height, tileset.texture, tileset.tilewidth, tileset.tileheight, tileset.spacing, tileset.spacing, tileset.margin, tileset.margin, map.tilewidth, map.tileheight)   for y=1,layer.height do for x=1,layer.width do local i = x + (y - 1) * layer.width local gid = layer.data[i] if gid ~= 0 then local tx = (gid - tileset.firstgid) % tileset.sizex + 1 local ty = math.floor((gid - tileset.firstgid) / tileset.sizex) + 1 tilemap:setTile(x, y, tx, ty) end end end   tilemap:setAlpha(layer.opacity) self:addChild(tilemap)   end   function TiledMap:getLayer(name)   -- if we have a name parameter and it's a string if name and type(name) == 'string' then -- search for name for index = 1, #map.layers do -- if found if map.layers[index].name == name then -- return it return map.layers[index]   end   end   end   end   function TiledMap:getProperty(item, name)   -- if we have an item and if item and name and type(item) == 'table' and type(name) == 'string' then   for k, v in pairs(item.properties) do   if k == name then   return v   end   end   end   end