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copied!<p>The answer by samplebias was great for me. I extended it for the large images I am working with by adding zoom and pan capabilities. </p> <pre><code>import pygame, sys from pygame.locals import K_a, K_s,K_w,K_d,K_LEFTBRACKET,K_RIGHTBRACKET from PIL import Image pygame.init() BG_COLOR = (0,0,0) def displayRect(screen, px, topleft, prior,pos,scale): # ensure that the rect always has positive width, height #topleft = [(val-pos[i])/scale for i,val in enumerate(topleft)] topleft = [(val/scale-pos[i]) for i,val in enumerate(topleft)] x, y = topleft bottomright = pygame.mouse.get_pos() width = bottomright[0] - topleft[0] height = bottomright[1] - topleft[1] if width < 0: x += width width = abs(width) if height < 0: y += height height = abs(height) # eliminate redundant drawing cycles (when mouse isn't moving) current = x, y, width, height if not (width and height): return current if current == prior: return current # draw transparent box and blit it onto canvas rect = px.get_rect() px = pygame.transform.scale(px,[rect.width/scale, rect.height/scale]) screen.blit(px, (rect[0]-pos[0],rect[1]-pos[1])) im = pygame.Surface((width, height)) im.fill((128, 128, 128)) pygame.draw.rect(im, (32, 32, 32), im.get_rect(), 1) im.set_alpha(128) screen.blit(im, (x, y)) pygame.display.flip() # return current box extents return (x, y, width, height) def setup(px): screen = pygame.display.set_mode( px.get_rect()[2:] ) screen.blit(px, px.get_rect()) pygame.display.flip() return screen, px def move(pos,scale,px,screen): x,y = pos #print pos,x rect = px.get_rect() screen.fill(BG_COLOR) px = pygame.transform.scale(px,[rect.width/scale, rect.height/scale]) screen.blit(px, (rect[0]-x,rect[1]-y)) pygame.display.flip() #px.rect.topleft = pr.rect.topleft[0] - x, def mainLoop(screen, px, filelist): topleft = bottomright = prior = None n=0 scale = 1 pos = [0,0] while n!=1: for event in pygame.event.get(): if event.type == pygame.MOUSEBUTTONUP: if not topleft: topleft = [(val+pos[i])*scale for i,val in enumerate(event.pos)] print "tr: ",topleft else: bottomright = [(val+pos[i])*scale for i,val in enumerate(event.pos)] print "br: ",bottomright n=1 if event.type == pygame.KEYDOWN and event.key == K_a: pos = [pos[0]-200,pos[1]] move(pos,scale,px,screen) if event.type == pygame.KEYDOWN and event.key == K_d: pos = [pos[0]+200,pos[1]] move(pos,scale,px,screen) if event.type == pygame.KEYDOWN and event.key == K_w: pos = [pos[0],pos[1]-200] move(pos,scale,px,screen) if event.type == pygame.KEYDOWN and event.key == K_s: pos = [pos[0],pos[1]+200] move(pos,scale,px,screen) if event.type == pygame.KEYDOWN and event.key == K_RIGHTBRACKET: scale = scale/1.25 move(pos,scale,px,screen) if event.type == pygame.KEYDOWN and event.key == K_LEFTBRACKET: scale = scale*1.25 move(pos,scale,px,screen) if topleft: prior = displayRect(screen, px, topleft, prior,pos,scale) return ( topleft + bottomright ) </code></pre> <p>Use the <strong>main</strong> function samplebias provided.</p> <p>Thanks Stack Overflow!</p>

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