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Tôi có một vấn đề tương tự như này: LUA and Corona error: Attempt To Call Method ' ' (A Nil Value) - Driving Me Crazy Tôi có một lớp TCell:Object Lua
local TCell={};
local cell_mt = { __index=TCell };
function TCell.new(_contents_name,_x,_y)
...
local ncell=
{
...
};
function ncell:setup()
...
end
ncell:setup();
return setmetatable(ncell,cell_mt);
end
return TCell;
Tôi có mảng 2ngày tài liệu tham khảo TCell gọi là tế bào. Khi tôi chỉ định
cells[ind1][ind2]=cells[ind3][ind4]
ô [ind1] [ind2] bắt đầu mất một số thuộc tính. Nếu tôi hiểu liên kết ở trên chính xác thì điều đó gây ra bởi việc mất liên kết có thể so sánh được. Tôi có cần sử dụng setmetatable lần khác không? Làm thế nào tôi có thể làm điều đó nếu nhiệm vụ không được thực hiện trong cơ thể TCell?
cập nhật.
reset_metatable=function(target)
return setmetatable(target,cell_mt);
end;
cells[ind1][ind2]=cells[ind3][ind4];
cells[ind1][ind2]=cells[ind1][ind2]:reset_metatable();
không thực sự hữu ích. upd2: xóa tất cả mã không được kết nối với máy ảnh. Máy ảnh và TCell không có khung nhập. Vấn đề có vẻ là trong metatables. Đầu ra cho NOW 6 1 chiều rộng i 50 và sau nó BẮT ĐẦU NGAY 6 1 chiều rộng là nil
-----------------------------------------------------------------------------------------
--
-- Main Cycle
--
-----------------------------------------------------------------------------------------
local storyboard = require("storyboard")
local scene = storyboard.newScene()
-- include Corona's "physics" library
local physics = require "physics"
--control_circle=display.newImageRect(C.INTERFACE_DIR..C.INTERFACE_CONTROL_CIRCLE or C.EMPTY_IMAGE,C.CARS_W,C.CARS_W,true);
local events_added=false;
stage_frames=0;
physics.start(); physics.pause()
physics.setGravity(0,0);
local PCar=require("TCar")
local PBiped=require("TBiped");
local PCell=require("TCell");
local control_circle_len;
local cells={};
local cells_w,cells_h;
local wshift,hshift=-(C.SCREEN_THEORETICAL_W-C.SCREEN_W)/2,-(C.SCREEN_THEORETICAL_H-C.SCREEN_H)/2;
--------------------------------------------
-- forward declarations and other locals
-----------------------------------------------------------------------------------------
-- BEGINNING OF YOUR IMPLEMENTATION
--
-- NOTE: Code outside of listener functions (below) will only be executed once,
-- unless storyboard.removeScene() is called.
--
-----------------------------------------------------------------------------------------
local wsells,hcells=(C.SCREEN_W-C.SCREEN_W%C.LANDSCAPE_CELL_W)/C.LANDSCAPE_CELL_W+1,(C.SCREEN_H-C.SCREEN_H%C.LANDSCAPE_CELL_H)/C.LANDSCAPE_CELL_H+1;
local dfd=false;
local function manage_cells(cmx,cmy)
--print("#",cmx,cmy);
if((cmx==0 and cmy==0) or dfd)
then
return;
end
local cells_shift_w,cells_shift_h=0,0;
if(cmx>=0)
then
for i=cells_w,1,-1
do
if(cells[i][1]:out_of_borders_w()==true)
then
cells_shift_w=cells_shift_w+1;
else
break;
end
end
else
for i=1,cells_w,1
do
if(cells[i][1]:out_of_borders_w()==true)
then
cells_shift_w=cells_shift_w-1;
else
break;
end
end
end
if(cmy>=0)
then
for i=cells_h,1,-1
do
if(cells[1][i]:out_of_borders_h()==true)
then
--[[cells[1][i].contents.rotation=45;
dfd=true;]]
cells_shift_h=cells_shift_h+1;
else
break;
end
end
--return;
else
for i=1,cells_h,1
do
if(cells[1][i]:out_of_borders_h()==true)
then
cells_shift_h=cells_shift_h-1;
else
break;
end
end
end
--print("~",cells_shift_w,cells_shift_h);
local stx,finx,sty,finy=1,cells_shift_w,1,cells_shift_h;
if(cmx<0)
then
stx=cells_w+cells_shift_w;
finx=cells_w;
end
if(cmy<0)
then
sty=cells_h+cells_shift_h;
finy=cells_h;
end
for i=stx,finx,1
do
for j=1,cells_h,1
do
if(cells[i][j])
then
cells[i][j]:destroy();
cells[i][j]=nil;
end
end
end
for i=1,cells_w,1
do
for j=sty,finy,1
do
if(cells[i][j])
then
cells[i][j]:destroy();
cells[i][j]=nil;
end
end
end
stx,finx,sty,finy=cells_w-cells_shift_w-1,1,cells_h-cells_shift_h-1,1;
local itx,ity=-1,-1;
if(cmx>=0)
then
stx=cells_shift_w+1;
finx=cells_w;
itx=1;
print(stx,finx);
end
if(cmy>=0)
then
sty=cells_shift_h+1;
finy=cells_h;
ity=1;
end
for i=stx,finx,itx
do
for j=1,cells_h,1
do
if(cells_shift_w~=0)
then
if(j==1)
then
print(i,1,"to",i-cells_shift_w,1);
end
cells[i-cells_shift_w][j]=cells[i][j];
cells[i-cells_shift_w][j]=cells[i-cells_shift_w][j].reset_metatable(cells[i][j]);
print("++",cells[i-cells_shift_w][j].contents.width);
cells[i][j]:destroy();
cells[i][j]=nil;
if(j==1)
then
print(i-cells_shift_w,1,"width is",cells[i-cells_shift_w][1].contents.width);
if(i==7)
then
cells[6][1].debug=true;
print("debug is set");
end
end
end
end
end
for i=1,cells_w,1
do
for j=sty,finy,ity
do
if(cells_shift_h~=0)
then
print("?this?",i,j);
cells[i][j-cells_shift_h]=cells[i][j];
cells[i][j]:destroy();
cells[i][j]=nil;
end
end
end
for i=1,cells_w,1
do
for j=1,cells_h,1
do
if(cells[i][j]==nil)
then
print("*new",i,j);
cells[i][j]=PCell.new(C.LANDSCAPE_DICTIONARY(nil,1),(i-1)*C.LANDSCAPE_CELL_W+C.LANDSCAPE_CELL_W/2-wshift-camera:getX(),(j-1)*C.LANDSCAPE_CELL_H+C.LANDSCAPE_CELL_H/2-hshift-camera:getY());
end
end
end
end
local function stage_main_frame()
print("START NOW",6,1,"width is",cells[6][1].contents.width);
local old_camera_x,old_camera_y=camera._view.x,camera._view.y;
if(dfd==false)
then
--print("&");
camera._view.x=camera._view.x-stage_frames;
end
local cmx,cmy=-(camera:getX()-old_camera_x),-(camera:getY()-old_camera_y);
manage_cells(cmx,cmy);
stage_frames=stage_frames+1;
print("NOW",6,1,"width is",cells[6][1].contents.width);
return function(event)
end
end
-- Called when the scene's view does not exist:
function scene:createScene(event)
local group = self.view
end
-- Called immediately after scene has moved onscreen:
function control_player(event)
car1:get_touch(event);
end
function scene:enterScene(event)
camera:newLayer("land",1);
camera:newLayer("bipeds",1);
camera:newLayer("cars",1);
i=1;
while((i-1)*C.LANDSCAPE_CELL_W-C.LANDSCAPE_CELL_W/2-wshift<=C.SCREEN_W)
do
j=1;
cells[i]={};
while((j-1)*C.LANDSCAPE_CELL_H-C.LANDSCAPE_CELL_H/2-hshift<=C.SCREEN_H)
do
cells[i][j]=PCell.new(C.LANDSCAPE_DICTIONARY(nil,1),(i-1)*C.LANDSCAPE_CELL_W+C.LANDSCAPE_CELL_W/2-wshift-camera:getX(),(j-1)*C.LANDSCAPE_CELL_H+C.LANDSCAPE_CELL_H/2-hshift-camera:getY());
j=j+1;
end
i=i+1;
end
cells_w,cells_h=#cells,#cells[1];
local group = self.view
physics.start();
physics.setPositionIterations(1)
if(events_added==false)
then
events_added=true;
Runtime:addEventListener("touch",control_player);
Runtime:addEventListener("enterFrame",stage_main_frame);
end
end
-- Called when scene is about to move offscreen:
function scene:exitScene(event)
local group = self.view
physics.stop()
end
-- If scene's view is removed, scene:destroyScene() will be called just prior to:
function scene:destroyScene(event)
local group = self.view
package.loaded[physics] = nil
physics = nil
end
-----------------------------------------------------------------------------------------
-- END OF YOUR IMPLEMENTATION
-----------------------------------------------------------------------------------------
-- "createScene" event is dispatched if scene's view does not exist
scene:addEventListener("createScene", scene)
-- "enterScene" event is dispatched whenever scene transition has finished
scene:addEventListener("enterScene", scene)
-- "exitScene" event is dispatched whenever before next scene's transition begins
scene:addEventListener("exitScene", scene)
-- "destroyScene" event is dispatched before view is unloaded, which can be
-- automatically unloaded in low memory situations, or explicitly via a call to
-- storyboard.purgeScene() or storyboard.removeScene().
scene:addEventListener("destroyScene", scene)
-----------------------------------------------------------------------------------------
return scene
.
local TCell={};
local cell_mt = { __index=TCell };
function TCell.new(_contents_name,_x,_y)
--print(camera.x);
if(_x==nil)
then
_x=0;
end
if(_y==nil)
then
_y=0;
end
camera:newLayer("abacaba", 1);
local ncell=
{
contents_name=_contents_name;
contents;
sequence_data;
sheet_data;
debug=false;
--[[main_frame;
main_frame_handler=function(self)
main_frame=function(event)
if(self.contents.x+self.contents.width/2<0 or self.contents.y+self.contents.height/2<0 or self.contents.x-self.contents.width/2>C.SCREEN_W or self.contents.y-self.contents.height/2>C.SCREEN_H)
then
--self:destroy();
end
end
return main_frame;
end;]]
clear=function(self)
if(self.debug==true)
then
print("CLEAR!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n\n\n\n\n");
end
--print(self.contents);
self.contents:removeSelf();
camera:removeObject("land",self.contents);
end;
show=function(self,_contents_name,__x,__y)
if(self.debug==true)
then
print("SHOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n\n\n\n\n");
end
self.contents_name=_contents_name;
if(self.contents_name~=C.EMPTY_IMAGE)
then
self:set_sequence_data();
end
if(self.contents_name~=C.EMPTY_IMAGE)
then
self.sheet_data=graphics.newImageSheet(self.contents_name,C.LANDSCAPE_SHEET_DATA);
self.contents=display.newSprite(self.sheet_data,self.sequence_data);
else
self.contents=display.newImageRect(C.EMPTY_IMAGE,C.LANDSCAPE_CELL_W,C.LANDSCAPE_CELL_H,true);
self.sequence_data=nil;
end
self.contents.x=__x;
self.contents.y=__y;
camera:addObject("land",self.contents);
end;
out_of_borders_w=function(self)
--print(self.contents.width);
return self.contents.x+self.contents.width/2-camera:getX()<C.LANDSCAPE_CELLS_LEFT_BORDER-C.LANDSCAPE_CELL_W or
self.contents.x-self.contents.width/2-camera:getX()>C.LANDSCAPE_CELLS_RIGHT_BORDER+C.LANDSCAPE_CELL_W;
end;
out_of_borders_h=function(self)
return self.contents.y+self.contents.height/2-camera:getY()<C.LANDSCAPE_CELLS_UPPER_BORDER-C.LANDSCAPE_CELL_H or
self.contents.y-self.contents.height/2-camera:getY()>C.LANDSCAPE_CELLS_LOWER_BORDER+C.LANDSCAPE_CELL_H;
end;
reset_metatable=function(target)
return setmetatable(target,cell_mt);
end;
set_sequence_data=function(self)
local px=math.floor(((_x)%C.LANDSCAPE_SHEET_DATA.sheetContentWidth)/C.LANDSCAPE_SHEET_DATA.width)+1;
local py=math.floor(((_y)%C.LANDSCAPE_SHEET_DATA.sheetContentHeight)/C.LANDSCAPE_SHEET_DATA.height)+1;
self.sequence_data=
{
{ name = "only", start=C.LANDSCAPE_SHEET_DATA.sheetContentWidth/C.LANDSCAPE_SHEET_DATA.width*(py-1)+px, count=1 }
};
end;
destroy=function(self)
--Runtime:removeEventListener("enterFrame",self.main_frame);
--Runtime:removeEventListener("enterFrame",self.main_frame_handler);
self:clear();
if(index~=nil)
then
--destroy_cell(index);
end
end
};
function ncell:setup()
self:show(self.contents_name,_x,_y);
end
ncell:setup();
return setmetatable(ncell,cell_mt);
end
return TCell;
Có sự không khớp '[' – hjpotter92
Đã sửa. Đó là một ví dụ. Mã này trông giống như: các ô [i-cells_shift_w] [j] = các ô [i] [j]; – user2136963
Bạn có chắc chắn rằng 'i-cells_shift_w',' i' và 'j' luôn trỏ đến các khóa hợp lệ không? –