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浅析μC/GUI-v3.90a之GUI_DispString函数
文章来源:http://gliethttp.cublog.cn
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1.GUI_DispString()函数
gui/core/GUI_DispString.c
void GUI_DispString(const char GUI_UNI_PTR *s) {
int xAdjust, yAdjust, xOrg;
int FontSizeY;
if (!s)
return;
GUI_LOCK();
FontSizeY = GUI_GetFontDistY(); //Font的y大小,默认8
xOrg = GUI_Context.DispPosX;
/* Adjust vertical position */
yAdjust = GUI_GetYAdjust(); //垂直对齐方式
GUI_Context.DispPosY -= yAdjust;
for (; *s; s++) {
GUI_RECT r;
int LineNumChars = GUI__GetLineNumChars(s, 0x7fff); //获取一行\0或\n 8bits字节数[该版本只能显示英文]
int xLineSize = GUI__GetLineDistX(s, LineNumChars); //这些数据所占用x轴上横向点阵数
/* Check if x-position needs to be changed due to h-alignment */
switch (GUI_Context.TextAlign & GUI_TA_HORIZONTAL) { //水平对齐方式
case GUI_TA_CENTER: xAdjust = xLineSize / 2; break;
case GUI_TA_RIGHT: xAdjust = xLineSize; break;
default: xAdjust = 0;
}
r.x0 = GUI_Context.DispPosX -= xAdjust;
r.x1 = r.x0 + xLineSize - 1;
r.y0 = GUI_Context.DispPosY;
r.y1 = r.y0 + FontSizeY - 1; //该行字体显示矩形区域r
GUI__DispLine(s, LineNumChars, &r); //显示该行数据
GUI_Context.DispPosY = r.y0;
s += GUI_UC__NumChars2NumBytes(s, LineNumChars); //s指向下一行待显示的数据区
if ((*s == '\n') || (*s == '\r')) {
switch (GUI_Context.TextAlign & GUI_TA_HORIZONTAL) {
case GUI_TA_CENTER:
case GUI_TA_RIGHT:
GUI_Context.DispPosX = xOrg; //居中和右对齐,传递函数原始位置xOrg
break;
default:
GUI_Context.DispPosX = GUI_Context.LBorder;
break;
}
if (*s == '\n')
GUI_Context.DispPosY += FontSizeY; //回车,转入下一行
} else {
GUI_Context.DispPosX = r.x0 + xLineSize; //接着上一行的结束位置,继续显示
}
if (*s == 0) //待显示数据已经显示完毕
break;
}
GUI_Context.DispPosY += yAdjust; //将垂直对齐方式还原成未调用GUI_DispString之前值
GUI_Context.TextAlign &= ~GUI_TA_HORIZONTAL; //清除文本水平对齐方式
GUI_UNLOCK();
}
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2.GUI__DispLine()函数 2007-07-11 gliethttp
gui/core/GUICharLine.c
void GUI__DispLine(const char GUI_UNI_PTR *s, int MaxNumChars, const GUI_RECT* pr) {
GUI_RECT r;
{
r = *pr;
#if GUI_WINSUPPORT
WM_ADDORG(r.x0, r.y0);
WM_ADDORG(r.x1, r.y1); //将矩形(r.x0,r.y0)平移到(GUI_Context.xOff,GUI_Context.yOff)坐标处
WM_ITERATE_START(&r) { //计算剪切域,另用《浅析μC/GUI-v3.90a之WM_ITERATE_START剪切域计算宏》专门讨论
#endif
GUI_Context.DispPosX = r.x0;
GUI_Context.DispPosY = r.y0;
/* Do the actual drawing via routine call. */
_DispLine(s, MaxNumChars, &r);
#if GUI_WINSUPPORT
} WM_ITERATE_END();
WM_SUBORG(GUI_Context.DispPosX, GUI_Context.DispPosY);
#endif
}
}
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