CODE:

import dxlib;

bool canRun(){
	return 
		CheckHitKey(KEY_INPUT_ESCAPE) == 0 &&
		ProcessMessage() != -1;
}

int map[5][5] = [
		[1,1,1,1,1],
		[1,0,1,0,1],
		[1,1,1,1,1],
		[1,0,1,0,1],
		[1,1,1,1,1],
	];

void main(){
	ChangeWindowMode(TRUE);
	if(DxLib_Init() == -1) return;
	scope(exit) DxLib_End();
	
	int handle[2];
	LoadDivGraph("map2.png", 2, 1, 2, 38, 19, handle.ptr);
	int graph_w, graph_h;
	GetGraphSize(handle[0], &graph_w, &graph_h);
	
	int mouse_x=0, mouse_y=0;
	int select_x, select_y;
	int before_x, before_y;
	int slip_x=0, slip_y=0;
	
	SetDrawScreen(DX_SCREEN_BACK);
	while(canRun()){
		ClearDrawScreen();
		
		before_x = mouse_x;
		before_y = mouse_y;
		GetMousePoint(&mouse_x, &mouse_y);
		
		if((GetMouseInput() & MOUSE_INPUT_RIGHT) != 0){
			slip_x += mouse_x - before_x;
			slip_y += mouse_y - before_y;
		}
		
		select_x = ((mouse_x - slip_x) / graph_w) + ((mouse_y - slip_y) / graph_h);
		select_y = ((mouse_x - slip_x) / graph_w) - ((mouse_y - slip_y) / graph_h);
		
		for(int i=0; i<map.length; i++){
			for(int j=0; j<map[i].length; j++){
				if(map[i][j] == 1){
					int x = (graph_w / 2) * (j + i);
					int y = (graph_h / 2) * (j - i);
					int num = (j == select_x && i == select_y) ? 1 : 0;
					
					DrawGraph(x + slip_x, y + slip_y, handle[num], TRUE);
				}
			}
		}
		
		DrawFormatString(300, 0, GetColor(255,255,255), "mouse_x = %d", mouse_x);
		DrawFormatString(300, 10, GetColor(255,255,255), "mouse_y = %d", mouse_y);
		DrawFormatString(300, 20, GetColor(255,255,255), "select_x = %d", select_x);
		DrawFormatString(300, 30, GetColor(255,255,255), "select_y = %d", select_y);
		DrawFormatString(300, 40, GetColor(255,255,255), "graph_x = %d", graph_w);
		DrawFormatString(300, 50, GetColor(255,255,255), "graph_y = %d", graph_h);
		
		ScreenFlip();
	}
}