CODE:

#include "DxLib.h"
#include "joypad.h"

double x=320, y=240;

int WINAPI WinMain(HINSTANCE hI, HINSTANCE hP, LPSTR lpC, int nC){
	ChangeWindowMode(TRUE);
	SetOutApplicationLogValidFlag(FALSE);
	SetWindowText("DxLib");
	if(DxLib_Init() == -1) return(-1);
	SetAlwaysRunFlag(TRUE);
	SetDrawScreen(DX_SCREEN_BACK);


	while(ProcessMessage() == 0 && CheckHitKey(KEY_INPUT_ESCAPE) == 0){
        ClsDrawScreen();

		joypad jp;

		x += 10*jp.x;
		y += 10*jp.y;

		DrawCircle( (int)x,(int)y, 2, 0xffffff);

		ScreenFlip();
	}

	DxLib_End();
	return(0);
}

CODE:

#include "DxLib.h"
#include 

#ifndef _JOYPAD_
#define _JOYPAD_

struct joypad{
	struct DistData{
		double x, y, speed;

		DistData(){}
		DistData(double rx, double ry, double rspeed){ x=rx,y=ry,speed=rspeed; }
	};
	struct StickData{
		int x, y;

		StickData(){}
		StickData(int rx, int ry){ x=rx, y=ry; }
	};

	int padx, pady;
	double x, y;
	double dx, dy;
	int padNum;
	int padState;
	int keyState;

	void init(int pad = 1){
		padNum = GetJoypadNum();
		int pads[4]={DX_INPUT_PAD1,DX_INPUT_PAD2,DX_INPUT_PAD3,DX_INPUT_PAD4};
		type = pads[pad-1];
		GetJoypadAnalogInput(&padx, &pady, pads[pad-1]);
		padState = GetJoypadInputState(type);
		keyState = GetJoypadInputState(DX_INPUT_KEY);

		DistData d = GetDist(padx, pady);
		dx = d.x, dy = d.y;
		x = dx*d.speed;
		y = dy*d.speed;
	}
	joypad(int pad = 1){ init(pad); }

	bool check(int padInput, bool perm = true){
		if(padState&padInput) return true;
		if(perm){
			if(keyState&padInput) return true;
			return false;
		}
		return false;
	}

	void config(int PadInput, int KeyInput1, int KeyInput2 = -1, int KeyInput3 = -1, int KeyInput4 = -1){
		SetJoypadInputToKeyInput(type, PadInput, KeyInput1, KeyInput2, KeyInput3, KeyInput4);
	}

	void vib(int time = -1, int power = 1000){ StartJoypadVibration(type, power, time); }

	void stop(){ StopJoypadVibration(type); }

private:

	int type;

	double GetSpeed(int b, int s){
		double hyp = sqrt( (double)(b*b+s*s) );
		double S = s*1000/fabs( (double)b);
		double HYP = sqrt( (double)(1000*1000+S*S) );

		return hyp / HYP;
	}

	DistData GetDist(int rx, int ry){
		StickData stick(rx, ry);
		DistData d(0,0,0);
		if(stick.x==0 && stick.y==0) return d;

		double hyp_2 = stick.x*stick.x + stick.y*stick.y;
		double hyp = sqrt(hyp_2);
		d.x = stick.x/hyp;
		d.y = stick.y/hyp;
		if(fabs( (double)stick.x) >= fabs( (double)stick.y) ) d.speed = GetSpeed(stick.x, stick.y);
		else d.speed = GetSpeed(stick.y, stick.y);

		return d;
	}
};

#endif