def __init__(self, buffer_x, buffer_y):
self.writer = PNGWriter()
self.background_color = [255, 255, 255]
self.pixels = [self.background_color*buffer_x for y in range(buffer_y)]
self.buffer_x = buffer_x
self.buffer_y = buffer_y
class Renderer:
"""A class designed to take the output of drawing methods and write them to png's
:Methods:
- 'render': Writes the current buffer out to file
- 'clearBuffer': Refreshes the buffer to the background color
- 'setBackgroundColor': Sets the background color of the buffer, or returns it
- 'drawOver': Adds the given pixels to the buffer, drawing over non-background pixels
- 'drawUnder': Adds the given pixels to the buffer, drawing under non-background pixels
:Examples:
>>> from pygraph.render.Renderer import Renderer
>>> from pygraph.draw.shapes.BasicShapes import BasicShapes
>>> renderer = Renderer(400, 400) # Output Buffer Size
>>> shapes = BasicShapes(400, 400) # Draw Canvas Size
>>> line1 = shapes.drawLine(10, 10, 300, 300, (255, 0 , 0)) # A shape == A list of pixels
>>> line2 = shapes.drawLine(20, 20, 20, 350, (0, 0, 255)) # Another shape
>>> renderer.setBackgroundColor(255, 255, 255) # The default color is white (if no color is received by a shape, then the background color is used)
>>> renderer.clearBuffer() # Reset buffer for a new image
>>> renderer.drawOver(line1) # Put the line in the buffer
>>> renderer.drawOver(line2) # Put the second line in the buffer, covering any pixels shared by other items in the buffer
>>> renderer.render('./test.png') # Output current buffer to a file
"""
def __init__(self, buffer_x, buffer_y):
self.writer = PNGWriter()
self.background_color = [255, 255, 255]
self.pixels = [self.background_color*buffer_x for y in range(buffer_y)]
self.buffer_x = buffer_x
self.buffer_y = buffer_y
def render(self, file_name='NONE'):
if (file_name != 'NONE'):
try:
self.writer.write(file_name, self.pixels)
except OSError:
return self.pixels
else:
return self.pixels
def clearBuffer(self):
self.pixels = [sum([self.background_color for x in range(self.buffer_x)], []) for y in range(self.buffer_y)]
def setBackgroundColor(self, R=256, G=256, B=256):
if (R <= 255 and G <= 255 and B <= 255 and R >= 0 and G >= 0 and B >= 0):
self.background_color = [R, G, B]
self.pixels = [self.background_color*self.buffer_x for y in range(self.buffer_y)]
return self.background_color
def drawOver(self, pixels, x_orig = 0, y_orig = 0):
for pix in pixels:
eff_x = pix[0] + x_orig
eff_y = pix[1] + y_orig
if (eff_x >= 0 and eff_x <= (self.buffer_x - 1) and eff_y >= 0 and eff_y <= (self.buffer_y - 1)):
self.pixels[eff_y][3*eff_x:3*eff_x+3] = pix[2]
def drawUnder(self, pixels, x_orig = 0, y_orig = 0):
for pix in pixels:
eff_x = pix[0] + x_orig
eff_y = pix[1] + y_orig
if (self.pixels[eff_y][3*eff_x:3*eff_x+3] == self.background_color and eff_x >= 0 and eff_x <= (self.buffer_x - 1) and eff_y >= 0 and eff_y <= (self.buffer_y - 1)):
self.pixels[eff_y][3*eff_x:3*eff_x+3] = pix[2]