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drawCanvas.py
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drawCanvas.py
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# -*- coding:utf-8 -*-
class Canvas():
def __init__(self, width=100, height=100, clearChar=' ', pixelChar='*'):
self.width = width
self.height = height
self.clearChar = clearChar
self.pixelChar = pixelChar
self.initCanvas()
def initCanvas(self):
self.canvas = [[self.clearChar] * self.width for i in range(self.height)]
def display(self):
for i in self.canvas:
print ''.join(i)
def drawPixel(self, x, y):
# lack of validation
self.canvas[y][x] = self.pixelChar
c = Canvas()
drawPixel = c.drawPixel
def drawLine(x1, y1, x2, y2):
if x1 is x2:
for i in range(y2 - y1 + 1):
drawPixel(x1, y1 + i)
elif y1 is y2:
for i in range(x2-x1+1):
drawPixel(x1+i,y1)
else:
k=(y2-y1)/(x2-x1)
d=(y1*x2-y2*x1)/(x2-x1)
for i in range(x2 - x1 + 1):
drawPixel(x1+i, k*(x1+i)+d)
def drawTriangle(x1,y1,x2,y2,x3,y3):
drawLine(x1,y1,x2,y2)
drawLine(x1,y1,x3,y3)
drawLine(x2,y2,x3,y3)
def drawRectangle(x1, y1, x2, y2):
if (x1 is x2 ) or (y1 is y2):
drawLine(x1, y1, x2, y2)
else:
drawLine(x1,y1,x1,y2)
drawLine(x1,y1,x2,y1)
drawLine(x1,y2,x2,y2)
drawLine(x2,y1,x2,y2)
'''
def drawLine(x1,y1,x2,y2):
for i in range((x2-x1)*100):
drawPixel(x1+i/100,(y2-y1)/(x2-x1)*(x1+i/100)+(y1*x2-y2*x1)/(x2-x1))
'''
def test_drawline():
#drawPixel(1, 3)
#drawPixel(3, 9)
#drawPixel(6,7)
drawLine(1, 3, 6, 7)
#drawLine(1,3,8,10)
#drawLine(1.0,3.0,5,9)
def test_drawRecangle():
drawRectangle(1,3,1,3)
drawRectangle(7,3,9,3)
drawRectangle(30,20,35,30)
drawRectangle(40,50,80,90)
def test_drawTriangle():
drawTriangle(20,40,20,55,40,40)
#drawTriangle(2,5,3,6,8,12)
#test_drawline()
test_drawTriangle()
#testdrawRecangle()
c.display()