Hello !
i’m writing a little game with c# sdlDotNet, and i made my own map
scrolling. but i don’t known its right way or not.
i create large map (5000x5000), actually i don’t create 5000px surface
(you’ll see below)
here is the code:
Game Class----------------------------
public const int ScreenW = 1024;
//Screen Width
public const int ScreenH = 768;
//Screen Height
public static int parseX = 0;
//mapX in large map
public static int parseY = 0;
//mapY in large map
public const short scrollSpeed = 10;
//map scrolling speed
public static char scrollWayX = ‘N’;
//scrolling where x? N = nowhere
public static char scrollWayY = ‘N’;
//scrolling where y? N = nowhere
Draw Method
Map.ParseMap(parseX, parseY);
//draw map objects (see above)
Video.Screen.Update();
//update screen
MouseMotion Method
public void Motion ( MouseMotionEventArgs e ) {
if (e.X > Game.ScreenW - 20) {
//mouse scroll right
Game.parseX += Game.scrollSpeed;
//increase showmap X
Game.scrollWayX = ‘R’;
//set our way to R (Right)
}
else if (e.X < 10) {
//mouse scroll left
Game.parseX -= Game.scrollSpeed;
//decrease showmap X
Game.scrollWayX = ‘L’;
//set our wat to L (Left)
}
else Game.scrollWayX = ‘N’;
//stop x scrolling
if (e.Y > Game.ScreenH - 20) {
//mouse scroll down
Game.parseY += Game.scrollSpeed; //increase
showmap Y
Game.scrollWayY = ‘D’;
//set our way to D (Down)
}
else if (e.Y < 10) {
//mouse scroll up
Game.parseY -= Game.scrollSpeed; //decrease
showmap Y
Game.scrollWayY = ‘U’;
//set our way to U (Up)
}
else Game.scrollWayY = ‘N’;
//stop y scrolling
}
Map File
#split , each line
#1. argument: C is “Content Block” not used
#2. argument: Sprite file name (1.png, 2.png, 3.png, 4.png)
#3. argument: Sprite’s X position in our map
#4. argument: Sprite’s Y position in our map
C,1,899,1200
C,2,949,1205
C,3,998,1190
C,4,2350,4500
Map Class - ParseMap Method
//contents (SpriteConnection) variable in this method, loaded map contents
(see above)
public void ParseMap(int x, int y) {
//parse current view map sprites
int stopX = x + Game.ScreenW;
//check end sprite's x
int stopY = y + Game.ScreenH;
//check end sprite's y
int startX = x - Game.ScreenW;
//check start sprite's x
int startY = y - Game.ScreenH;
//check start sprite's y
for (int i = 0; i < contents.Count; i++) {
//check for all map contents ("C" prefix lines in map file)
bool parse = false;
//set parse or not option of each sprite
if (contents[i].X >= 0 && contents[i].X <= stopX) {
//if each sprite's x positions in our blocks
if (contents[i].Y >= 0 && contents[i].Y <= stopY) {
//if each sprite's y positions in our blocks
parse = true;
//sprite is in our blocks, we can draw it
}
}
if (Game.scrollWayX == 'L') {
//if mouse left scrolling
contents[i].X += Game.scrollSpeed;
//mouse going left, sprite must go right
}
else if (Game.scrollWayX == 'R') {
//if mouse right scrolling
contents[i].X -= Game.scrollSpeed;
//mouse going right, sprite must go left
}
if (Game.scrollWayY == 'U') {
//if mouse up scrolling
contents[i].Y += Game.scrollSpeed;
//mouse going up, sprite must go down
}
else if (Game.scrollWayY == 'D') {
//if mouse down scrolling
contents[i].Y -= Game.scrollSpeed;
//mouse going down, sprite must go up
}
if (parse == true) {
//if we can draw this sprite
Video.Screen.Blit(contents[i],
contents[i].Rectangle); //so draw it
}
}
}
basicly
- i set x and y of sprites (in map file),
- when mouse scrolling, check if any sprites in our 1024 x 768 block
(parse=true) blit sprite, if not in our block not draw (parse = false)
its working fine yet, but i scare about future if hundreds of sprite on our
map
Question is:
am i go wrong way or what?
What do you think about that?
thank you.
Hasan ZORLU
