這裡,我們介紹下PyChart模塊,其繪圖還是比較方便的,而且繪出的圖像也還不錯。我們除了需要安裝PyChart模塊之外,還需要安裝Ghostscript和GSview,為了方便大家,PyChart與 GSview下載地址:
免費下載地址在 http://linux.linuxidc.com/
用戶名與密碼都是www.linuxidc.com
具體下載目錄在 /2012年資料/5月/29日/Python之PyChart畫圖方法/
OK,安裝完之後,看一個簡單的示例代碼:
- # http://www.linuxidc.com/
- from pychart import *
- class zap_y_coord(linear_coord.T):
- def get_canvas_pos(self, size, val, min, max):
- if val <= 70:
- return linear_coord.T.get_canvas_pos(self, size, val, 0, 110)
- elif val <= 240:
- return linear_coord.T.get_canvas_pos(self, size, 70, 0, 110)
- else:
- return linear_coord.T.get_canvas_pos(self, size, val - 170, 0, 110)
- def get_tics(self, min, max, interval):
- tics = linear_coord.T.get_tics(self, min, max, interval)
- return [x for x in tics if x < 65 or x > 256]
- # can = canvas.default_canvas()
- can = canvas.init('flykite.png')
- theme.scale_factor=3
- theme.use_color=True
- theme.reinitialize()
- data = [(10, 20, 30, 5), (20, 265, 33, 5),
- (30, 255, 30, 5), (40, 45, 51, 7), (50, 25, 27, 3)]
- chart_object.set_defaults(area.T, size = (150, 120), y_range = (0, 280),
- y_coord = zap_y_coord(),
- x_coord = category_coord.T(data, 0))
- chart_object.set_defaults(bar_plot.T, data = data)
- bar_plot.fill_styles.reset();
- plot1=bar_plot.T(label="foo", cluster=(0,3))
- plot2=bar_plot.T(label="bar", hcol=2, cluster=(1,3))
- plot3=bar_plot.T(label="baz", hcol=3, cluster=(2,3))
- ar = area.T(loc=(250,0),
- x_axis=axis.X(label="X label", format="/a-30{}%d"),
- y_axis=axis.Y(label="Y label", tic_interval=10))
- ar.add_plot(plot1, plot2, plot3)
- ar.draw()
- for x in (ar.x_pos(10) - 20, ar.x_pos(20)- 10, ar.x_pos(30) - 10):
- zap.zap_horizontally(can, line_style.default, fill_style.white,
- x, ar.y_pos(65), x+16, ar.y_pos(65) + 4, 4, 4)
為了生成png圖片,使用以下命令運行程序:
- python flykite.py --format=png
圖片效果如下:
650) this.width=650;" border=0>