如何創建幾何畫筆

原創

2020-02-22 15:44

創建幾何畫筆時出現“需要的資源無法得到”警告對話框。

原因：創建幾何畫筆時候總是出現“需要的資源無法得到”的警告信息，發現原因是，設置了PS_USERSTYLE, 並且沒有設置CPen( intnPenStyle, intnWidth, const LOGBRUSH*pLogBrush, intnStyleCount = 0, const DWORD*lpStyle = NULL );
的後兩個參數。或者，沒有設置PS_USERSTYLE，而設置了上述函數的後兩個參數。

創建方形畫筆的一個示例：

[cpp] view plain copy

print?

DWORD penFlags=PS_GEOMETRIC | PS_ENDCAP_SQUARE | PS_JOIN_BEVEL;
LOGBRUSH lb;
lb.lbStyle=BS_SOLID;
lb.lbColor=RGB(100, 200, 200);
lb.lbHatch=HS_VERTICAL;
CPen tmpPen(penFlags, 20, &lb);

       DWORD penFlags=PS_GEOMETRIC | PS_ENDCAP_SQUARE | PS_JOIN_BEVEL;
        LOGBRUSH lb;
        lb.lbStyle=BS_SOLID;
        lb.lbColor=RGB(100, 200, 200);
        lb.lbHatch=HS_VERTICAL;
        CPen tmpPen(penFlags, 20, &lb);

方形畫筆與圓形畫筆的不同：

[cpp] view plain copy

print?

// 設置邏輯畫刷
LOGBRUSH logBrush;
logBrush.lbStyle = BS_SOLID;
logBrush.lbColor = RGB(10, 20, 100);
logBrush.lbHatch = HS_CROSS;
int x1 = 100, y = 100, x2 = 400;
int i = 0;
// 使用方形畫筆繪製各種樣式的直線
for (i = 0; i < 5; ++i)
{
CPen pen(i | PS_GEOMETRIC | PS_ENDCAP_SQUARE | PS_JOIN_BEVEL, 20, &logBrush);
pDC->SelectObject(&pen);
pDC->MoveTo(x1, y + i * 40);
pDC->LineTo(x2, y + i * 40);
pen.DeleteObject();
}
x1 = 500, x2 = 800;
// 使用圓形畫筆創建各種樣式的直線
for (i = 0; i < 5; ++i)
{
CPen pen(i | PS_GEOMETRIC | PS_ENDCAP_ROUND | PS_JOIN_BEVEL, 20, &logBrush);
pDC->SelectObject(&pen);
pDC->MoveTo(x1, y + i * 40);
pDC->LineTo(x2, y + i * 40);
pen.DeleteObject();
}

   // 設置邏輯畫刷
    LOGBRUSH logBrush;
    logBrush.lbStyle = BS_SOLID;
    logBrush.lbColor = RGB(10, 20, 100);
    logBrush.lbHatch = HS_CROSS;
    int x1 = 100, y = 100, x2 = 400;    
    int i = 0;
    // 使用方形畫筆繪製各種樣式的直線
    for (i = 0; i < 5; ++i)
    {
        CPen pen(i | PS_GEOMETRIC | PS_ENDCAP_SQUARE | PS_JOIN_BEVEL, 20, &logBrush);       
        pDC->SelectObject(&pen);
        pDC->MoveTo(x1, y + i * 40);
        pDC->LineTo(x2, y + i * 40);
        pen.DeleteObject();
    }

    x1 = 500, x2 = 800;
    // 使用圓形畫筆創建各種樣式的直線
    for (i = 0; i < 5; ++i)
    {
        CPen pen(i | PS_GEOMETRIC | PS_ENDCAP_ROUND | PS_JOIN_BEVEL, 20, &logBrush);        
        pDC->SelectObject(&pen);
        pDC->MoveTo(x1, y + i * 40);
        pDC->LineTo(x2, y + i * 40);
        pen.DeleteObject();
    }

運行結果：