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feat: remove the white background from the sprite
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@MrKonstantinSh
MrKonstantinSh committed Dec 2, 2020
1 parent 5fa987d commit 8148f76
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Showing 3 changed files with 43 additions and 178 deletions.
216 changes: 40 additions & 176 deletions Lab_1/Lab_1/Lab_1.cpp
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Original file line number Diff line number Diff line change
@@ -1,43 +1,31 @@
#include <Windows.h>
#include<gdiplus.h>
#include <Windows.h>
#include "resource.h"

#define _USE_MATH_DEFINES
#include<cmath>
#pragma comment(lib, "msimg32.lib")

#define WM_LOAD_SPRITE WM_USER
#define WM_UPDATE_SPRITE (WM_USER + 1)
#define WM_LOAD_DEFAULT_SPRITE (WM_USER + 2)
#define WM_UPDATE_SPRITE (WM_USER)
#define WM_LOAD_DEFAULT_SPRITE (WM_USER + 1)
#define BACKGROUND_COLOR COLOR_WINDOW

constexpr auto WINDOW_NAME = "Lab_1";
constexpr auto SPRITE_STEP = 10;
constexpr auto SPRITE_DEGREE_ROTATE_STEP = 15;

constexpr auto VK_W = 0x57;
constexpr auto VK_A = 0x41;
constexpr auto VK_S = 0x53;
constexpr auto VK_D = 0x44;

constexpr auto VK_Q = 0x51;
constexpr auto VK_E = 0x45;

constexpr auto VK_L = 0x4c;

ATOM RegisterWindowClass(HINSTANCE);
BOOL InitWindowInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

HINSTANCE _hInstance;

bool PostLoadDefaultSpriteMessage(HWND hWnd, HINSTANCE hInstance)
{
return PostMessage(hWnd, WM_LOAD_DEFAULT_SPRITE, NULL, (LPARAM)hInstance);
}

bool PostLoadSpriteMessage(HWND hWnd)
{
return PostMessage(hWnd, WM_LOAD_SPRITE, NULL, NULL);
}


bool PostUpdateSpriteMessage(HWND hWnd)
{
return PostMessage(hWnd, WM_UPDATE_SPRITE, NULL, NULL);
Expand Down Expand Up @@ -149,137 +137,39 @@ COORD CreateLeftSteps()
return steps;
}

XFORM GetMovementXform(COORD coordinates)
{
XFORM xForm;
xForm.eM11 = 1;
xForm.eM12 = 0;
xForm.eM21 = 0;
xForm.eM22 = 1;
xForm.eDx = coordinates.X;
xForm.eDy = coordinates.Y;

return xForm;
}

XFORM GetRotationXform(short degreeAngle)
{
XFORM xForm;
FLOAT radAngle = (FLOAT)(M_PI * degreeAngle / 180);
FLOAT angleSin = sin(radAngle);
FLOAT angleCos = cos(radAngle);

xForm.eM11 = angleCos;
xForm.eM12 = angleSin;
xForm.eM21 = -angleSin;
xForm.eM22 = angleCos;
xForm.eDx = 0;
xForm.eDy = 0;

return xForm;
}

LRESULT LoadSprite(HWND hWnd, HBITMAP& sprite)
{
char fileName[MAX_PATH] = { NULL };

OPENFILENAME openFileName;
openFileName.lStructSize = sizeof(OPENFILENAME);
openFileName.hwndOwner = hWnd;
openFileName.hInstance = NULL;
openFileName.lpstrFilter = "Images\0*.bmp;*.gif;*.jpeg;*.png;\0\0";
openFileName.lpstrCustomFilter = NULL;
openFileName.nFilterIndex = 1;
openFileName.lpstrFile = fileName;
openFileName.nMaxFile = sizeof(fileName);
openFileName.lpstrFileTitle = NULL;
openFileName.lpstrInitialDir = NULL;
openFileName.lpstrTitle = "Select sprite";
openFileName.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST;
openFileName.lpstrDefExt = NULL;

if (GetOpenFileName(&openFileName))
{
int fileNameLength = MultiByteToWideChar(CP_ACP, 0, fileName, -1, NULL, 0);
WCHAR* wideCharFileName = new WCHAR[MultiByteToWideChar(CP_ACP, 0, fileName, -1, NULL, 0)];
MultiByteToWideChar(CP_ACP, 0, fileName, -1, wideCharFileName, fileNameLength);

Gdiplus::GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

Gdiplus::Bitmap* sourceImage = Gdiplus::Bitmap::FromFile(wideCharFileName);
HBITMAP hBitmap;
Gdiplus::Color imageBackgroundColor;
imageBackgroundColor.SetFromCOLORREF(GetSysColor(COLOR_WINDOW));
Gdiplus::Status bitmapStatus = sourceImage->GetHBITMAP(imageBackgroundColor, &hBitmap);

Gdiplus::GdiplusShutdown(gdiplusToken);

if (bitmapStatus != Gdiplus::Ok)
return -1;

SIZE windowSize = GetClientWindowSize(hWnd), spriteSize = GetSpriteSize(hBitmap);
if ((windowSize.cx < spriteSize.cx) || (windowSize.cy < spriteSize.cy))
return -2;

sprite = hBitmap;

return 0;
}

return 1;
}

bool PutSpriteOnWindow(HWND hWnd, HBITMAP sprite, COORD coordinates, short angle)
bool PutSpriteOnWindow(HWND hWnd, HBITMAP sprite, COORD coordinates)
{
HDC windowDC = GetDC(hWnd);
HDC spriteDC = CreateCompatibleDC(windowDC);

HGDIOBJ oldObject = SelectObject(spriteDC, sprite);
SIZE bitmapSize = GetSpriteSize(sprite);

XFORM xForm;
int graphicsMode = SetGraphicsMode(windowDC, GM_ADVANCED);

xForm = GetMovementXform(coordinates);
SetWorldTransform(windowDC, &xForm);

COORD transformationCenter;
transformationCenter.X = (SHORT)(-(coordinates.X + bitmapSize.cx / 2));
transformationCenter.Y = (SHORT)(-(coordinates.Y + bitmapSize.cy / 2));
xForm = GetMovementXform(transformationCenter);
ModifyWorldTransform(windowDC, &xForm, MWT_RIGHTMULTIPLY);

xForm = GetRotationXform(angle);
ModifyWorldTransform(windowDC, &xForm, MWT_RIGHTMULTIPLY);

transformationCenter.X = -transformationCenter.X;
transformationCenter.Y = -transformationCenter.Y;
xForm = GetMovementXform(transformationCenter);
ModifyWorldTransform(windowDC, &xForm, MWT_RIGHTMULTIPLY);

bool result = BitBlt(windowDC, 0, 0, bitmapSize.cx, bitmapSize.cy, spriteDC, 0, 0, SRCCOPY);
ModifyWorldTransform(windowDC, NULL, MWT_IDENTITY);
SetGraphicsMode(windowDC, graphicsMode);

SelectObject(spriteDC, oldObject);
bool result = TransparentBlt(windowDC, // дескриптор приемного DC
coordinates.X, // x-коорд. верхнего левого угла приемника
coordinates.Y, // y-коорд. верхнего левого угла приемника
bitmapSize.cx, // ширина приемного прямоугольника
bitmapSize.cy, // высота приемного прямоугольника
spriteDC, // дескриптор источника DC
0, // x-коорд. верхнего левого угла источника
0, // y-коорд. верхнего левого угла источника
bitmapSize.cx, // ширина источника прямоугольника
bitmapSize.cy, // высота источника прямоугольника
RGB(255, 255, 255)); // цвет который делается прозрачным

DeleteDC(spriteDC);
ReleaseDC(hWnd, windowDC);

return result;
}

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR cmdLine, int cmdShowMode)
int APIENTRY WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPTSTR cmdLine, _In_ int showMode)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(cmdLine);

MSG msg;

RegisterWindowClass(hInstance);

if (!InitWindowInstance(hInstance, cmdShowMode))
if (!InitWindowInstance(hInstance, showMode))
return FALSE;

while (GetMessage(&msg, NULL, 0, 0))
Expand All @@ -303,68 +193,55 @@ ATOM RegisterWindowClass(HINSTANCE hInstance)
windowClassEx.hInstance = hInstance;
windowClassEx.hIcon = LoadIcon(0, IDI_WINLOGO);;
windowClassEx.hCursor = LoadCursor(0, IDC_ARROW);
windowClassEx.hbrBackground = (HBRUSH)(COLOR_WINDOW);
windowClassEx.hbrBackground = (HBRUSH)(BACKGROUND_COLOR);
windowClassEx.lpszMenuName = 0;
windowClassEx.lpszClassName = WINDOW_NAME;
windowClassEx.hIconSm = 0;

return RegisterClassEx(&windowClassEx);
}

BOOL InitWindowInstance(HINSTANCE hInstance, int cmdShowMode)
BOOL InitWindowInstance(HINSTANCE hInstance, int showMode)
{
HWND hWnd;

hWnd = CreateWindow(WINDOW_NAME, WINDOW_NAME, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);
hWnd = CreateWindow(WINDOW_NAME, // Указатель на зарегистрированное имя класса.
WINDOW_NAME, // Указатель на имя окна.
WS_OVERLAPPEDWINDOW, // Стиль окна.
CW_USEDEFAULT, // Горизонтальная позиция окна.
CW_USEDEFAULT, // Вертикальная позиция окна.
CW_USEDEFAULT, // Ширина окна.
CW_USEDEFAULT, // Высота окна.
NULL, // Дескриптор родительского или окна владельца.
NULL, // Дескриптор меню или ID дочернего окна.
hInstance, // Дескриптор экземпляра приложения.
NULL); // Указатель на данные создания окна.

if (!hWnd)
return FALSE;

ShowWindow(hWnd, cmdShowMode);
UpdateWindow(hWnd);
ShowWindow(hWnd, showMode);

// Load default sprite.
PostLoadDefaultSpriteMessage(hWnd, hInstance);

return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HBITMAP sprite = NULL;
static COORD spritePosition = { 0, 0 };
static short angle = 0;

switch (message)
{
case WM_LOAD_DEFAULT_SPRITE:
if ((sprite = LoadBitmap((HINSTANCE)lParam, MAKEINTRESOURCE(IDB_SPRITE))) != NULL)
PostUpdateSpriteMessage(hWnd);
break;
case WM_LOAD_SPRITE:
switch (LoadSprite(hWnd, sprite))
{
case 0:
spritePosition = { 0, 0 };
angle = 0;
PostUpdateSpriteMessage(hWnd);
break;
case -1:
MessageBox(hWnd, "An unknown error occurred while loading the sprite.",
"Unknown error", MB_OK | MB_ICONERROR);
break;
case -2:
MessageBox(hWnd, "The sprite does not fit into the window.",
"Large sprite size", MB_OK | MB_ICONERROR);
break;
default:
break;
}
break;
case WM_UPDATE_SPRITE:
FillWindowWithColor(hWnd, GetSysColor(COLOR_WINDOW));
PutSpriteOnWindow(hWnd, sprite, spritePosition, angle);
FillWindowWithColor(hWnd, GetSysColor(BACKGROUND_COLOR));
PutSpriteOnWindow(hWnd, sprite, spritePosition);
break;
case WM_KEYDOWN:
switch (wParam)
Expand All @@ -389,17 +266,6 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
spritePosition = CreateNewSpritePosition(spritePosition, CreateLeftSteps(), hWnd, sprite);
PostUpdateSpriteMessage(hWnd);
break;
case VK_Q:
angle -= SPRITE_DEGREE_ROTATE_STEP;
PostUpdateSpriteMessage(hWnd);
break;
case VK_E:
angle += SPRITE_DEGREE_ROTATE_STEP;
PostUpdateSpriteMessage(hWnd);
break;
case VK_L:
PostLoadSpriteMessage(hWnd);
break;
default:
break;
}
Expand Down Expand Up @@ -432,8 +298,6 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
}
}
break;
case WM_ERASEBKGND:
return 1;
case WM_SIZE:
PostUpdateSpriteMessage(hWnd);
return DefWindowProc(hWnd, message, wParam, lParam);
Expand All @@ -445,4 +309,4 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
}

return 0;
}
}
5 changes: 3 additions & 2 deletions Lab_1/Lab_1/resource.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,14 @@
// Microsoft Visual C++ generated include file.
// Used by Lab_1.rc
//
#define IDB_SPRITE 101

#define IDB_SPRITE 107

// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 102
#define _APS_NEXT_RESOURCE_VALUE 108
#define _APS_NEXT_COMMAND_VALUE 40001
#define _APS_NEXT_CONTROL_VALUE 1001
#define _APS_NEXT_SYMED_VALUE 101
Expand Down
Binary file modified Lab_1/Lab_1/sprite.bmp
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