EEPW论坛

在前几次的实验中，已经将GUI和操作系统都移植完成。这次就做了一个简单的涂鸦板。功能：能调整画笔的粗细，任意涂鸦并能清屏。

基于上一个实验的代码继续编写代码：

重要的两个任务是：

void GUI_TOUCH_TASK(void *pdata) { pdata = pdata; for(;;) { OSTimeDly(TIMEDELAY_TOUCH); GUI_TOUCH_Exec(); //触屏检测 } } void GUI_EEPW_TASK(void *pdata) { pdata = pdata; for(;;) { OSTimeDlyHMSM(0,0,1,0); } } void GUI_GD32_TASK(void *pdata) { pdata = pdata; GUI_TaskFunc(); for(;;) { WM_Exec(); //GUI重绘 OSTimeDly(TIMEDELAY_PAINT); } }

为了方便，先在GUI懒人工具上完成界面布局，便可获取如下代码：

static const GUI_WIDGET_CREATE_INFO _aDialogCreate[] = { { FRAMEWIN_CreateIndirect, "GD32", 0, 0, 0, 240,320,FRAMEWIN_CF_MOVEABLE,0}, { SLIDER_CreateIndirect, NULL, GUI_ID_SLIDER0, 1, 264,160,26, 0,0}, { BUTTON_CreateIndirect, "CLEAR", GUI_ID_BUTTON0, 167,264,68, 26, 0,0} }; void InitDialog(WM_MESSAGE * pMsg) { WM_HWIN hWin = pMsg->hWin; // //FRAMEWIN // FRAMEWIN_SetClientColor(hWin,0xffff80); FRAMEWIN_SetFont(hWin,&GUI_FontHZ16); FRAMEWIN_AddMinButton(hWin, FRAMEWIN_BUTTON_RIGHT, 2); FRAMEWIN_SetTitleHeight(hWin,17); // //GUI_ID_SLIDER0 // SLIDER_SetBkColor(WM_GetDialogItem(hWin,GUI_ID_SLIDER0),0xffff80); SLIDER_SetRange(WM_GetDialogItem(hWin,GUI_ID_SLIDER0),1,10); SLIDER_SetValue(WM_GetDialogItem(hWin,GUI_ID_SLIDER0),10); // //GUI_ID_BUTTON0 // BUTTON_SetBkColor(WM_GetDialogItem(hWin,GUI_ID_BUTTON0),BUTTON_CI_UNPRESSED,0x8080ff); BUTTON_SetFont(WM_GetDialogItem(hWin,GUI_ID_BUTTON0),&GUI_FontHZ16); }

添加了两个控件，一个用来调整画笔的大小，一个用来清屏：

回调函数是整个功能的核心：

static void _cbCallback(WM_MESSAGE * pMsg) { int NCode, Id; static u16 x_draw,y_draw; static u16 length_fram; GUI_PID_STATE GUI_PID_DRAW; WM_HWIN hWin = pMsg->hWin; switch (pMsg->MsgId) { case WM_CREATE: length_fram = FRAMEWIN_GetTitleHeight(hWin); break; case WM_PAINT: PaintDialog(pMsg); GUI_SetColor(GUI_RED); if(x_draw < 200 && x_draw > 40 && y_draw < 200 + length_fram && y_draw > 20 + length_fram) { GUI_SetPenSize(SLIDER_GetValue(WM_GetDialogItem(hWin,GUI_ID_SLIDER0))); GUI_DrawPoint(x_draw,y_draw - length_fram); DrawFlag = 0; } break; case WM_INIT_DIALOG: InitDialog(pMsg); break; case WM_KEY: switch (((WM_KEY_INFO*)(pMsg->Data.p))->Key) { case GUI_KEY_ESCAPE: GUI_EndDialog(hWin, 1); break; case GUI_KEY_ENTER: GUI_EndDialog(hWin, 0); break; } break; case WM_NOTIFY_PARENT: Id = WM_GetId(pMsg->hWinSrc); NCode = pMsg->Data.v; switch (Id) { case GUI_ID_OK: if(NCode==WM_NOTIFICATION_RELEASED) GUI_EndDialog(hWin, 0); break; case GUI_ID_CANCEL: if(NCode==WM_NOTIFICATION_RELEASED) GUI_EndDialog(hWin, 0); break; case GUI_ID_BUTTON0: if(NCode==WM_NOTIFICATION_RELEASED) { DrawFlag = 0; x_draw = 0; y_draw = 0; WM_InvalidateRect(WM_GetClientWindow(hWin),&RectDraw); } break; } break; case WM_TOUCH: GUI_TOUCH_GetState(&GUI_PID_DRAW); x_draw = GUI_PID_DRAW.x; y_draw = GUI_PID_DRAW.y; if(x_draw < 200 && x_draw > 40 && y_draw < 200 + length_fram && y_draw > 20 + length_fram) { DrawFlag = 1; WM_InvalidateRect(WM_GetClientWindow(hWin),&RectDraw); } break; default: WM_DefaultProc(pMsg); } }

看看效果图：