如何绘制正方形并动态分配颜色属性（PDFsharp）？

Question

我正在使用PDFsharp导出图表图例。我使用for循环和表来显示属性。实际上只有一个属性：Subdivision名称。该对象具有正确的RGB颜色。如图表图例显示系列那样，如何在它旁边绘制正方形？请原谅我的变量名，我要举个例子。

//Writting Table Header Text
textformater.DrawString(" Color", tableheader, XBrushes.Black, snoColumn);
textformater.DrawString(" Subdivision Name", tableheader, XBrushes.Black, snoStudentName);

foreach (var item in data)
{
    y = y + 30;
    XRect snoColumnVal = new XRect(35, y, 70, height);
    XRect snoStudentNameVal = new XRect(100, y, 250, height);
    textformater.DrawString(item.Color, tableheader, XBrushes.Black, snoColumnVal);
    textformater.DrawString(item.Name, tableheader, XBrushes.Black, snoStudentNameVal);

}

这是输出：

这就是我需要的样子

Answer 1

我在演示中使用了这个结构：

struct RowItem
{
    public int R, G, B;
    public string Text;
}

这是我的测试数据：

var data = new[]
               {
                   new RowItem{R = 255, G = 0, B = 0, Text = "Red row"},
                   new RowItem{R = 0, G = 255, B = 0, Text = "Green row"},
                   new RowItem{R = 255, G = 255, B = 0, Text = "Yellow row"},
                   new RowItem{R = 0, G = 0, B = 255, Text = "Blue row"},
                   new RowItem{R = 255, G = 0, B = 255, Text = "Purple row"},
                   new RowItem{R = 0, G = 255, B = 255, Text = "Cyan row"},
                   new RowItem{R = 0, G = 0, B = 0, Text = "Black row"}
               };

这是执行绘图的代码：

foreach (var item in data)
{
    y = y + 30;
    XRect snoColumnVal = new XRect(35, y, 60, 25);
    XRect snoStudentNameVal = new XRect(100, y, 250, 25);
    var brush = new XSolidBrush(XColor.FromArgb(255, item.R, item.G, item.B));
    gfx.DrawRectangle(XPens.Black, brush, snoColumnVal);
    textformater.DrawString(item.Text, font, XBrushes.Black, snoStudentNameVal);
}

R，G和B是颜色分量（范围0到255）。

Answer 2

Just draw the square like so:

// Create solid brush.
SolidBrush blueBrush = new SolidBrush(Color.Blue);

// Create rectangle.
Rectangle rect = new Rectangle(0, 0, 200, 200);

// Fill rectangle to screen.
e.Graphics.FillRectangle(blueBrush, rect);

Here is how you set the color:

// Create a green color using the FromRgb static method.
Color myRgbColor = new Color();
myRgbColor = Color.FromRgb(0, 255, 0);
return myRgbColor;

Ref: https://msdn.microsoft.com/en-us/library/19sb1bw6(v=vs.110).aspx

Answer 3

要绘制正方形，请使用DrawRectangle代替DrawString。

示例代码可在此处找到：
http://pdfsharp.net/wiki/Graphics-sample.ashx#Draw_rectangles_6

Graphics样本也包含在PDFsharp源包中。