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现在的智能设备上经常见到那种环形的滑块,很炫酷。最近做项目也想做个这样的滑块,不过emwin没提供这样的控件。参考了坛友的分享自己魔改了一个出来。精简了一些代码,内存占用低,性能比较好。
参考:
http://www.armbbs.cn/forum.php?mod=viewthread&tid=30614&extra=page%3D1%26filter%3Ddigest%26digest%3D1
http://www.armbbs.cn/forum.php?mod=viewthread&tid=91792&extra=page%3D1
在F103上实测,只有旋钮控件情况下只需35Kb动态内存,这是实际不影响手指操作体验的大小,再大就要更多内存。操作时略微卡顿(F103跟不上了。。),欢迎大佬们来优化。
缺点是滑块另外画的,比较难看。因为没使用32bpp内存设备,所以旋钮控件自带的滑块用不了,欢迎大佬来实现更好看的滑块。
模拟器:
- /*********************************************************************
- * *
- * SEGGER Microcontroller GmbH & Co. KG *
- * Solutions for real time microcontroller applications *
- * *
- **********************************************************************
- * *
- * C-file generated by: *
- * *
- * GUI_Builder for emWin version 5.32 *
- * Compiled Oct 8 2015, 11:59:02 *
- * (c) 2015 Segger Microcontroller GmbH & Co. KG *
- * *
- **********************************************************************
- * *
- * Internet: www.segger.com Support: support@segger.com *
- * *
- **********************************************************************
- */
- // USER START (Optionally insert additional includes)
- // USER END
- #include "DIALOG.h"
- /*********************************************************************
- *
- * Defines
- *
- **********************************************************************
- */
- #define ID_WINDOW_0 (GUI_ID_USER + 0x00)
- #define ID_KNOB_0 (GUI_ID_USER + 0x01)
- // USER START (Optionally insert additional defines)
- #define KNOB_XSIZE 85 //旋钮控件的大小,越大约占内存
- #define KNOB_YSIZE 85
- #define KNOB_STEP 5 //画环时的弧长系数
- #define AA_FACT 3 //抗锯齿质量
- // USER END
- /*********************************************************************
- *
- * Static data
- *
- **********************************************************************
- */
- // USER START (Optionally insert additional static data)
- // USER END
- /*********************************************************************
- *
- * _aDialogCreate
- */
- static const GUI_WIDGET_CREATE_INFO _aDialogCreate[] = {
- { WINDOW_CreateIndirect, "Window", ID_WINDOW_0, 0, 0, 320, 240, 0, 0x0, 0 },
- // USER START (Optionally insert additional widgets)
- { KNOB_CreateIndirect, "", ID_KNOB_0, 115, 45, KNOB_XSIZE, KNOB_YSIZE, WM_CF_SHOW}
- // USER END
- };
- /*********************************************************************
- *
- * Static code
- *
- **********************************************************************
- */
- // USER START (Optionally insert additional static code)
- /*--------------- 画环形滑块 -----------------
- */
- static void _DrawWheel(KNOB_Handle hKnob) {
- GUI_COLOR mycolor;
- I32 Value;
- int xPos, yPos;
- int ArcStart = 360 - KNOB_STEP, ArcEnd = 360;
- int i=0, step;
- Value = 360 - KNOB_GetValue(hKnob) / 10; //获取当前值
- step = Value / KNOB_STEP; //算出需要画内部弧形的个数
- xPos = 115 + KNOB_XSIZE / 2; //计算坐标,确保环和内部弧形是以旋钮控件中心为原点
- yPos = 45 + KNOB_YSIZE / 2;
- GUI_SetFont(&GUI_Font13B_ASCII);
- GUI_AA_EnableHiRes(); //开高分辨率模式
- GUI_AA_SetFactor(AA_FACT); //抗锯齿因子,关闭抗锯齿可减少卡顿
- /*画圆环*/
- GUI_SetPenSize(16); //使用弧线画环,可以调整画笔实现弧线粗细
- GUI_SetColor(0x00f5ec80);
- GUI_AA_DrawArc(xPos*AA_FACT, yPos*AA_FACT, 38*AA_FACT, 38*AA_FACT, 0, 360);
- /*根据旋钮值画内部弧形*/
- GUI_SetColor(0x00FFFFD0);
- GUI_SetPenSize(8);
- for(; i<=step-1; i++)
- { //增大KNOB_STEP可减少画弧形的次数,可减少卡顿,但滑块变化精度变低
- GUI_AA_DrawArc(xPos*AA_FACT, yPos*AA_FACT, 38*AA_FACT, 38*AA_FACT, ArcStart, ArcEnd);
-
- ArcEnd = ArcStart; //上一个弧形的初角度成为下一个弧形的末角度
- ArcStart = ArcStart - KNOB_STEP;//下一个弧形的初角度
- }
- GUI_SetColor(0x000000FF);
- for(; i<=step; i++) //最后几段弧形作为滑块指示
- {
- GUI_AA_DrawArc(xPos*AA_FACT, yPos*AA_FACT, 38*AA_FACT, 38*AA_FACT, ArcStart, ArcEnd);
-
- ArcEnd = ArcStart; //上一个弧形的初角度成为下一个弧形的末角度
- ArcStart = ArcStart - KNOB_STEP;//下一个弧形的初角度
- }
- GUI_AA_DisableHiRes();//关闭高分辨率
- GUI_SetColor(GUI_WHITE);
- GUI_DispDecAt(Value,xPos-16,yPos-3, 5);
-
-
- }
- // USER END
- /*********************************************************************
- *
- * _cbDialog
- */
- static void _cbDialog(WM_MESSAGE * pMsg) {
- WM_HWIN hItem;
- // USER START (Optionally insert additional variables)
- static GUI_MEMDEV_Handle hMemKnobSmall;
- // USER END
- switch (pMsg->MsgId) {
- case WM_INIT_DIALOG:
- //
- // Initialization of 'Window'
- //
- hItem = pMsg->hWin;
- WINDOW_SetBkColor(hItem, GUI_MAKE_COLOR(0x00738640));
- //
- // 初始化旋钮
- //
- KNOB_SetRange(WM_GetDialogItem(pMsg->hWin,ID_KNOB_0), 0, 3600);
- KNOB_SetOffset(WM_GetDialogItem(pMsg->hWin,ID_KNOB_0), 0);
- KNOB_SetPeriod(WM_GetDialogItem(pMsg->hWin,ID_KNOB_0), 100); //控制旋钮减速度
- KNOB_SetPos(WM_GetDialogItem(pMsg->hWin,ID_KNOB_0),3600);
- // USER END
- break;
- // USER START (Optionally insert additional message handling)
- case WM_PAINT:
- _DrawWheel(WM_GetDialogItem(pMsg->hWin,ID_KNOB_0));
- break;
- // USER END
- default:
- WM_DefaultProc(pMsg);
- break;
- }
- }
- /*********************************************************************
- *
- * Public code
- *
- **********************************************************************
- */
- /*********************************************************************
- *
- * CreateWindow
- */
- WM_HWIN CreateKNOB(void);
- WM_HWIN CreateKNOB(void) {
- WM_HWIN hWin;
- hWin = GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbDialog, WM_HBKWIN, 0, 0);
- return hWin;
- }
- // USER START (Optionally insert additional public code)
- // USER END
- /*************************** End of file ****************************/
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