how a simple level editor is made?

DrewDough · 2004-03-22T04:37:04

high, im thinking of making a level editor for my pacman clone (for learning purposes) and was wondering, how do people make these? i would do it like this: first, the game is tile based so the level editor must be. what i would do would be to first fill up the screen with an array of "blank space" tiles. if using 32x32 tiles with an 800x600 screen, i would make an array map[25][19] (y,x), then i would loop through each element of the array and draw a tile at the element*32, like a traditional tile based program. then, each frame i would re-draw this map array. now, based on mouse input, i would do collision detection for where the user clicks, then, where that user clicked, i would find which elemeny this was in the map array, and re-assign the value of this element to whatever the user was currently drawing. as in, if the user was drawing a wall tile, he would click on the screen, it would find which element this spot was in the array, then it would change this value to WALL. then, the next frame, when the map was re-drawn, it would now be a wall in that spot. there would have to be a menu of some kind to switch between tiles (maybe an invisable one and the user (me) would just have to know which key to press to switch tiles?) anyway, after the user was done with making the map, this array would be either written to a txt file and uploaded later, or if i wanted to make the level editor a part of the game (most likely) i would just transfer the array to be the map the user next plays on. so, is this how its typically done? or am i going about it all wrong way, or what? thanks for any input [edited by - graveyard filla on March 19, 2004 9:41:26 PM]

For Beginners

Started by graveyard filla March 19, 2004 08:39 PM

12 comments, last by graveyard filla 20 years, 1 month ago

Mkk

126

March 21, 2004 01:00 AM

Don´t know how you can get mouse coords with SDL but I´m pretty sure it´s easy thing to do..

about collision and things.. I just described in my last post how I did them.. I don´t know what do you mean by saying "regular tile based collision detection"..

Grellin GDU

162

March 21, 2004 05:35 AM

Use SDL_GetMouseState(int x, int y) function to get the mouse coordinates.

"If you are not willing to try, you will never succeed!"

Grellin

"If you are not willing to try, you will never succeed!"GrellinC++ Game Programming

graveyard filla

605

Author

March 22, 2004 02:21 AM

mkk could you describe better how you found what tile the user clicked on? i see you divide by 46 and 23... is this your tile width/height?

FTA, my 2D futuristic action MMORPG

Mkk

126

March 22, 2004 04:32 AM

graveyard filla: Yes, 46 and 23 are the width and height of my tiles..

So to get the right tile.. first you have to decrease the number of pixels that are there before the gameboard itself.. In my editor there 170 pixels on x and 140 on y before the gameboard.

Example: The mouse is on bottom left corner of game board, let´s say it´s values are, x: 192, y: 150.

Here´s a pic.

Now we start to calculate numbers..

first we take off these extra pixels before game board (170 on x and 140 on y):

x = 192-170
x = 22

y = 150-140
y = 10

then we divide these numbers by width/height of the block:

x = 22/46 (width = 46)
x = 0,47826086956521739130434782608696
(but because x is integer type of variable, decimal numbers
are not considered and x will be zero)
x = 0

y = 10/23 (height = 23)
y = 0,43478260869565217391304347826087 (and y is also integer..)
y = 0

and now we have x = 0, y = 0 and we can put stuff to
first place in the array (and that´s the tile where the mouse is pointing):

gameBoard[x][y] = tile;

[edited by - Mkk on March 22, 2004 5:37:04 AM]

how a simple level editor is made?

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