绘制、选择并拖动矩形WinApi
我在拖动矩形和选择矩形时遇到问题 我必须画多个矩形(用鼠标左键),然后选择其中一个并在窗口周围拖动它(用鼠标右键)。但当我选择它时,它不会移动 选择的问题-当我尝试按降序(绘制它们的方式)选择它们时,它们全部被选中 这是我的密码:绘制、选择并拖动矩形WinApi,winapi,draw,drag,Winapi,Draw,Drag,我在拖动矩形和选择矩形时遇到问题 我必须画多个矩形(用鼠标左键),然后选择其中一个并在窗口周围拖动它(用鼠标右键)。但当我选择它时,它不会移动 选择的问题-当我尝试按降序(绘制它们的方式)选择它们时,它们全部被选中 这是我的密码: POINT LeftButtonDown; POINT ptCurrent; POINT ptClicked; vector<CRect> vRect; bool isRubberBand = false; bool IsClicked(CRect r,
POINT LeftButtonDown;
POINT ptCurrent;
POINT ptClicked;
vector<CRect> vRect;
bool isRubberBand = false;
bool IsClicked(CRect r, int x, int y);
void select(HWND hWnd, CRect r);
void deselect(HWND hWnd, CRect r);
void DrawRubberBand(HWND hWnd);
void MoveFromTo(HDC hdc, CRect rectSelected, POINTS anchor, POINTS now);
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
CRect add;
CRect rectSelected;
HDC hdc;
static POINTS anchor;
switch (message)
{
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
break;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code that uses hdc here...
for (auto& rc : vRect)
{
Rectangle(hdc,
rc.left,
rc.top,
rc.right,
rc.bottom
);
}
EndPaint(hWnd, &ps);
}
break;
case WM_LBUTTONDOWN:
{
LeftButtonDown.x = LOWORD(lParam); //Start point
LeftButtonDown.y = HIWORD(lParam);
isRubberBand = true;
ptCurrent.x = LOWORD(lParam); //current point
ptCurrent.y = HIWORD(lParam);
DrawRubberBand(hWnd); //draw the rect
}
break;
case WM_LBUTTONUP: // adding to a vector
{
if (!isRubberBand)
{
return 0;
}
isRubberBand = false;
//InvalidateRect(hWnd, NULL, TRUE);
add.SetRect(LeftButtonDown.x, LeftButtonDown.y, ptCurrent.x, ptCurrent.y); //setting the coords of the rect
vRect.push_back(add); //add the rect
UpdateWindow(hWnd);
}
break;
case WM_MOUSEMOVE:
if (wParam & MK_LBUTTON) //drawing the rectangle
{
hdc = GetDC(hWnd);
if (!isRubberBand)
{
break;
}
DrawRubberBand(hWnd);
ptCurrent.x = LOWORD(lParam);
ptCurrent.y = HIWORD(lParam);
DrawRubberBand(hWnd);
}
if (wParam & MK_RBUTTON) //dragging the rectangle
{
hdc = GetDC(hWnd);
POINTS now = MAKEPOINTS(lParam);
SetROP2(hdc, R2_NOTXORPEN);
MoveFromTo(hdc,rectSelected,anchor,now);
InvalidateRect(hWnd, NULL, TRUE);
anchor = MAKEPOINTS(lParam);
ReleaseDC(hWnd, hdc);
}
break;
case WM_RBUTTONDOWN:
{
int x{ LOWORD(lParam) }, y{ HIWORD(lParam) };
for (auto& rc : vRect)
{
if (IsClicked(rc, x, y))
{
select(hWnd, rc);
rectSelected= rc;
anchor = MAKEPOINTS(lParam);
break;
}
else {
deselect(hWnd, rc);
}
}
//select-deselect
}
break;
case WM_RBUTTONUP:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
bool IsClicked(CRect r, int x, int y)
{
POINT pt{ x, y };
return (bool)PtInRect(&r, pt);
}
void select(HWND hWnd, CRect r) {
HDC hdc = GetDC(hWnd);
HPEN selectPen = CreatePen(PS_DOT, 0, RGB(255, 0, 0));
SelectObject(hdc, selectPen);
Rectangle(hdc, r.left, r.top, r.right, r.bottom);
DeleteObject(selectPen);
}
void deselect(HWND hWnd, CRect r) {
HDC hdc = GetDC(hWnd);
Rectangle(hdc, r.left, r.top, r.right, r.bottom);
}
void DrawRubberBand(HWND hWnd) {
HDC hdc = GetDC(hWnd);
SetROP2(hdc, R2_NOT);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
Rectangle(hdc,
LeftButtonDown.x,
LeftButtonDown.y,
ptCurrent.x,
ptCurrent.y
);
ReleaseDC(hWnd, hdc);
}
void MoveFromTo(HDC hdc, CRect rectSelected, POINTS anchor, POINTS now)
{
Rectangle(hdc, rectSelected.left, rectSelected.top, rectSelected.right, rectSelected.bottom);
rectSelected.left = rectSelected.left + now.x - anchor.x; //x
rectSelected.top = rectSelected.top + now.y - anchor.y; //y
rectSelected.right = rectSelected.right + now.x - anchor.x; //x
rectSelected.bottom = rectSelected.bottom + now.y - anchor.y; //y
Rectangle(hdc, rectSelected.left, rectSelected.top, rectSelected.right, rectSelected.bottom);
}
指向LeftButtonDown;
点电流;
点击点;
矢量vRect;
bool-isRubberBand=false;
bool IsClicked(正确的r,int x,int y);
无效选择(HWND HWND,正确r);
无效取消选择(HWND HWND,正确r);
空心橡胶带(HWND HWND);
void MoveFromTo(HDC HDC,选择正确的矩形,点定位,点现在);
LRESULT回调WndProc(HWND HWND,UINT消息,WPARAM WPARAM,LPARAM LPARAM)
{
正确添加;
正确的选择;
HDC-HDC;
静态点锚;
开关(信息)
{
case WM_命令:
{
int wmId=低ORD(wParam);
//解析菜单选项:
交换机(wmId)
{
案例IDM_关于:
对话框(hInst、MAKEINTRESOURCE(IDD_ABOUTBOX)、hWnd、About);
打破
案例IDM_退出:
窗口(hWnd);
打破
违约:
返回DefWindowProc(hWnd、message、wParam、lParam);
}
}
打破
案例WM_油漆:
{
PAINTSTRUCT-ps;
HDC HDC=开始喷漆(hWnd和ps);
//TODO:在此处添加任何使用hdc的图形代码。。。
用于(自动和rc:vRect)
{
矩形(hdc,
左图,
rc.top,
对,
钢筋混凝土底层
);
}
端漆(hWnd和ps);
}
打破
案例WM_LBUTTONDOWN:
{
LeftButtonDown.x=LOWORD(lParam);//起点
LeftButtonDown.y=HIWORD(LPRAM);
isRubberBand=true;
ptCurrent.x=LOWORD(lParam);//当前点
ptCurrent.y=HIWORD(lpram);
DrawRubberBand(hWnd);//绘制矩形
}
打破
案例WM_LBUTTONUP://添加到向量
{
如果(!isRubberBand)
{
返回0;
}
isRubberBand=false;
//无效(hWnd,NULL,TRUE);
add.SetRect(LeftButtonDown.x,LeftButtonDown.y,ptCurrent.x,ptCurrent.y);//设置rect的坐标
vRect.push_back(add);//添加rect
更新窗口(hWnd);
}
打破
案例WM_MOUSEMOVE:
if(wParam&MK_LBUTTON)//绘制矩形
{
hdc=GetDC(hWnd);
如果(!isRubberBand)
{
打破
}
拉丝橡胶带(hWnd);
ptCurrent.x=低ORD(LPRAM);
ptCurrent.y=HIWORD(lpram);
拉丝橡胶带(hWnd);
}
if(wParam&mkrbutton)//拖动矩形
{
hdc=GetDC(hWnd);
现在的点=生成点(LPRAM);
SetROP2(hdc,R2_NOTXORPEN);
MoveFromTo(hdc、选定、锚定、现在);
无效(hWnd,NULL,TRUE);
锚点=制造点(LPRAM);
释放DC(hWnd、hdc);
}
打破
案例WM_RBUTTONDOWN:
{
intx{LOWORD(lParam)},y{HIWORD(lParam)};
用于(自动和rc:vRect)
{
if(单击(rc,x,y))
{
选择(hWnd,rc);
rect=rc;
锚点=制造点(LPRAM);
打破
}
否则{
取消选择(hWnd、rc);
}
}
//选择取消选择
}
打破
案例WM_RBUTTONUP:
打破
案例WM_销毁:
PostQuitMessage(0);
打破
违约:
返回DefWindowProc(hWnd、message、wParam、lParam);
}
返回0;
}
布尔被勾选(正确的r,整数x,整数y)
{
点pt{x,y};
返回(bool)PtInRect(&r,pt);
}
无效选择(HWND HWND,正确r){
HDC HDC=GetDC(hWnd);
HPEN selectPen=CreatePen(PS_点,0,RGB(255,0,0));
选择对象(hdc,选择笔);
矩形(hdc,右左,右上,右右下);
删除对象(选择笔);
}
无效取消选择(HWND HWND,更正r){
HDC HDC=GetDC(hWnd);
矩形(hdc,右左,右上,右右下);
}
空心拉丝橡胶带(HWND HWND){
HDC HDC=GetDC(hWnd);
SetROP2(hdc,R2_非);
选择对象(hdc、GetStockObject(NULL_笔刷));
矩形(hdc,
LeftButtonDown.x,
LeftButtonDown.y,
ptCurrent.x,
电流
);
释放DC(hWnd、hdc);
}
void MoveFromTo(HDC HDC,选择正确的矩形,点定位,点现在)
{
矩形(hdc、rectSelected.left、rectSelected.top、rectSelected.right、rectSelected.bottom);
rectSelected.left=rectSelected.left+now.x-anchor.x;//x
rectSelected.top=rectSelected.top+now.y-anchor.y;//y
rectSelected.right=rectSelected.right+now.x-anchor.x;//x
rectSelected.bottom=rectSelected.bottom+now.y-anchor.y;//y
矩形(hdc、rectSelected.left、rectSelected.top、rectSelected.right、rectSelected.bottom);
}
之所以按降序选择所有矩形,是因为在WM_RBUTTONDOWN
中找到了所选矩形,并且循环被中断,导致随后不执行矩形的取消选择
无法拖动矩形的原因有几个:
MoveFromTo
函数应传递rectSelected
的引用,否则函数中修改的矩形坐标无法应用于实际矩形
vRect
中删除,然后将拖动的矩形添加到vRect
,以确保在WM\u PAINT
中每次更新矩形的坐标
POINT LeftButtonDown;
POINT ptCurrent;
POINT ptClicked;
vector<CRect> vRect;
bool isRubberBand = false;
bool IsClicked(CRect r, int x, int y);
void select(HWND hWnd, CRect r);
void deselect(HWND hWnd, CRect r);
void DrawRubberBand(HWND hWnd);
void MoveFromTo(HDC hdc, CRect &rectSelected, POINTS anchor, POINTS now);
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
CRect add;
static CRect rectSelected;
TCHAR s[100] = L"";
HDC hdc;
static POINTS anchor;
switch (message)
{
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
break;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code that uses hdc here...
for (auto& rc : vRect)
{
Rectangle(hdc,
rc.left,
rc.top,
rc.right,
rc.bottom
);
}
EndPaint(hWnd, &ps);
}
break;
case WM_LBUTTONDOWN:
{
LeftButtonDown.x = LOWORD(lParam); //Start point
LeftButtonDown.y = HIWORD(lParam);
isRubberBand = true;
ptCurrent.x = LOWORD(lParam); //current point
ptCurrent.y = HIWORD(lParam);
DrawRubberBand(hWnd); //draw the rect
}
break;
case WM_LBUTTONUP: // adding to a vector
{
if (!isRubberBand)
{
return 0;
}
isRubberBand = false;
//InvalidateRect(hWnd, NULL, TRUE);
add.SetRect(LeftButtonDown.x, LeftButtonDown.y, ptCurrent.x, ptCurrent.y); //setting the coords of the rect
vRect.push_back(add); //add the rect
UpdateWindow(hWnd);
}
break;
case WM_MOUSEMOVE:
if (wParam & MK_LBUTTON) //drawing the rectangle
{
hdc = GetDC(hWnd);
if (!isRubberBand)
{
break;
}
DrawRubberBand(hWnd);
ptCurrent.x = LOWORD(lParam);
ptCurrent.y = HIWORD(lParam);
DrawRubberBand(hWnd);
}
if (wParam & MK_RBUTTON) //dragging the rectangle
{
hdc = GetDC(hWnd);
POINTS now = MAKEPOINTS(lParam);
if (PtInRect(&rectSelected, POINT{ now.x,now.y }))
{
SetROP2(hdc, R2_NOTXORPEN);
MoveFromTo(hdc, rectSelected, anchor, now);
InvalidateRect(hWnd, NULL, TRUE);
anchor = MAKEPOINTS(lParam);
}
ReleaseDC(hWnd, hdc);
}
break;
case WM_RBUTTONDOWN:
{
bool isFind = false;
int x{ LOWORD(lParam) }, y{ HIWORD(lParam) };
for (auto& rc : vRect)
{
if (!isFind && IsClicked(rc, x, y))
{
select(hWnd, rc);
rectSelected = rc;
anchor = MAKEPOINTS(lParam);
isFind = TRUE;
}
else {
deselect(hWnd, rc);
}
}
//select-deselect
}
break;
case WM_RBUTTONUP:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
bool IsClicked(CRect r, int x, int y)
{
POINT pt{ x, y };
return (bool)PtInRect(&r, pt);
}
void select(HWND hWnd, CRect r) {
HDC hdc = GetDC(hWnd);
HPEN selectPen = CreatePen(PS_DOT, 0, RGB(255, 0, 0));
SelectObject(hdc, selectPen);
Rectangle(hdc, r.left, r.top, r.right, r.bottom);
DeleteObject(selectPen);
}
void deselect(HWND hWnd, CRect r) {
HDC hdc = GetDC(hWnd);
Rectangle(hdc, r.left, r.top, r.right, r.bottom);
}
void DrawRubberBand(HWND hWnd) {
HDC hdc = GetDC(hWnd);
SetROP2(hdc, R2_NOT);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
Rectangle(hdc,
LeftButtonDown.x,
LeftButtonDown.y,
ptCurrent.x,
ptCurrent.y
);
ReleaseDC(hWnd, hdc);
}
void MoveFromTo(HDC hdc, CRect &rectSelected, POINTS anchor, POINTS now)
{
Rectangle(hdc, rectSelected.left, rectSelected.top, rectSelected.right, rectSelected.bottom);
for (auto it = vRect.begin();it != vRect.end();it++)
{
if (*it == rectSelected)
{
vRect.erase(it);
break;
}
}
rectSelected.left = rectSelected.left + now.x - anchor.x; //x
rectSelected.top = rectSelected.top + now.y - anchor.y; //y
rectSelected.right = rectSelected.right + now.x - anchor.x; //x
rectSelected.bottom = rectSelected.bottom + now.y - anchor.y; //y
Rectangle(hdc, rectSelected.left, rectSelected.top, rectSelected.right, rectSelected.bottom);
vRect.push_back(rectSelected);
}
指向LeftButtonDown;
点电流;
点击点;
矢量vRect;
bool-isRubberBand=false;
bool IsClicked(正确的r,int x,int y);
无效选择(HWND HWND,正确r);
无效取消选择(HWND HWND,正确r);
空心橡胶带(HWND HWND);
void MoveFromTo(HDC HDC,选择正确和正确,点定位,点现在);
LRESULT回调WndProc(HWND HWND,UINT消息,WPARAM WPARAM,LPARAM LPARAM)
{
正确添加