pen主要畫線（直線、矩形、圓等）
brush主要用於填充
'畫橢圓
pen1.dashstyle = drawing2d.dashstyle.dashdotdot '重設線型
pen1.color = color.blueviolet
gr.drawellipse(pen1, 10, 10, 200, 200)
gr.dispose()
end sub
private sub button2_click(sender as object, e as eventargs) handles button2.click
picturebox1.refresh()
pen1.color = color.green
pen1.dashstyle = drawing2d.dashstyle.dot
pen1.width = 1
dim x1, y1, x2, y2, x3, y3, x4, y4, x5, y5, r, s, t, u as single
for a as single = 0 to 2 * pi step pi / 120
x1 = 240 + 30 * cos(a)
y1 = 160 + 15 * sin(a)
r = 60 * (1 + 1 / 6 * sin(3 * a))
s = 80 * (1 + 1 / 6 * sin(4 * a))
t = 100 * (1 + 1 / 6 * sin(5 * a))
u = 140 * (1 + 1 / 8 * sin(6 * a))
x2 = r * cos(a + pi / 20) + 240
y2 = r * sin(a + pi / 20) + 160
x3 = s * cos(a) + 240
y3 = s * sin(a) + 160
x4 = t * cos(a + pi / 20) + 240
y4 = t * sin(a + pi / 20) + 160
x5 = 1.5 * u * cos(a) + 240
y5 = u * sin(a) + 160
pen1.color = color.red
gr = picturebox1.creategraphics
gr.drawline(pen1, x1, y1, x2, y2)
pen1.color = color.blueviolet
gr.drawline(pen1, x2, y2, x3, y3)
pen1.color = color.red
gr.drawline(pen1, x3, y3, x4, y4)
pen1.color = color.greenyellow
gr.drawline(pen1, x4, y4, x5, y5)
next
end sub
private sub button3_click(sender as object, e as eventargs) handles button3.click
'hatchbrush() 陰影筆刷
'lineargradientbrush 線性漸變筆刷
'solidbrush 單色筆刷
'texturebrush 紋理筆刷
'pathgradientbrus 漸變色填充
'陰影筆刷（十字圖案）
dim br1 as system.drawing.drawing2d.hatchbrush
br1 = new system.drawing.drawing2d.hatchbrush(drawing2d.hatchstyle.cross, color.red, color.black)
gr = picturebox1.creategraphics
gr.fillellipse(br1, 250, 0, 100, 150)
br1.dispose()
'線性漸變筆刷
dim br2 as system.drawing.drawing2d.lineargradientbrush
dim p1 as new point(140, 140) 'p1,p2控制漸變頻率
dim p2 as new point(160, 170)
br2 = new system.drawing.drawing2d.lineargradientbrush(p1, p2, color.red, color.black)
gr.fillrectangle(br2, 150, 150, 100, 50)
br2.dispose()
'漸變色填充（不規則或多邊形）
dim p(2) as point '建立path
p(0).x = 0 : p(0).y = 0
p(1).x = 20 : p(1).y = 10
p(2).x = 11 : p(2).y = 22
dim br3 as system.drawing.drawing2d.pathgradientbrush
br3 = new system.drawing.drawing2d.pathgradientbrush(p, drawing.drawing2d.wrapmode.tile)
br3.centercolor = color.blue '中心色
br3.surroundcolors = new color() '邊沿色對應各點數，除非是圓（一種色）
br3.centerpoint = new point(11, 15) '指定中心點
仔細一看上面pathgradientbrush筆刷，發現每個不規則封閉圖形中好像有「間距」，
我們放大看一下，原來，並不是間距，而是以這個不規則圖外沿作為乙個矩形，「平輔」到整個圖形中。
新增一下輔助線，就可以清晰看出它成圖的原因了：
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