更新:2007 年 11 月
這個範例會建立並填滿 Bitmap 物件,然後在 PictureBox 控制項中顯示此物件。若要執行此範例,請建立 Windows Form 應用程式專案,並將 PictureBox 控制項從 [工具箱] 拖曳到表單。圖片方塊控制項的大小並不重要,它會自動調整大小以符合點陣圖。將 CreateBitmap 方法貼上 Form1 類別,然後從 Form1_Load 事件處理常式方法予以呼叫。
範例
void CreateBitmap()
{
const int colWidth = 10;
const int rowHeight = 10;
System.Drawing.Bitmap checks = new System.Drawing.Bitmap(
colWidth * 10, rowHeight * 10);
// The checkerboard consists of 10 rows and 10 columns.
// Each square in the checkerboard is 10 x 10 pixels.
// The nested for loops are used to calculate the position
// of each square on the bitmap surface, and to set the
// pixels to black or white.
// The two outer loops iterate through
// each square in the bitmap surface.
for (int columns = 0; columns < 10; columns++)
{
for (int rows = 0; rows < 10; rows++)
{
// Determine whether the current sqaure
// should be black or white.
Color color;
if (columns % 2 == 0)
color = rows % 2 == 0 ? Color.Black : Color.White;
else
color = rows % 2 == 0 ? Color.White : Color.Black;
// The two inner loops iterate through
// each pixel in an individual square.
for (int j = columns * colWidth; j < (columns * colWidth) + colWidth; j++)
{
for (int k = rows * rowHeight; k < (rows * rowHeight) + rowHeight; k++)
{
// Set the pixel to the correct color.
checks.SetPixel(j, k, color);
}
}
}
}
}
編譯程式碼
這個範例需要:
- System 命名空間的參考。
穩固程式設計
以下情形可能會導致例外狀況:
- 嘗試設定點陣圖界限之外的像素。