c++ - SDL Small Screen -

-


c++ - SDL Small Screen -

when run code trying start programming tetris clone prints screen little rectangle (<30*30) , other part of screen black (it should green)

i know shouldn't give code don't know where's error

#include <string> #include <vector> #include "sdl/sdl.h" using namespace std; const unsigned short screen_width = 640; const unsigned short screen_height = 480; const unsigned short screen_bpp = 32; const unsigned char block_length = 20; enum color { bluish = 0, cyan, white, red, yellow, magenta, greenish }; struct point { int x, y; }; struct block { public: point l; color c; }; vector<block> blocks; sdl_surface *screen = null; void apply_surface(sdl_surface *source, sdl_surface *target, int x, int y, sdl_rect *clip = null); bool init(); bool clean_up(); void show_blocks (); int main(int argc, char** argv) { init(); sdl_fillrect(screen, null, 0x00ff00); (int = 0; < 4; i++) { block b; b.c = red; b.l.x = i; b.l.y = i; blocks.push_back(b); } show_blocks(); if (sdl_flip(screen) == -1) homecoming 1; sdl_delay(5000); clean_up(); homecoming 0; } void apply_surface(sdl_surface *source, sdl_surface *target, int x, int y, sdl_rect *clip) { sdl_rect o; o.x = x; o.y = y; sdl_blitsurface(source, clip, target, &o); } bool init() { if (sdl_init(sdl_init_everything) == -1) homecoming false; if (!(screen = sdl_setvideomode(screen_width, screen_height, screen_bpp, sdl_swsurface))) homecoming false; sdl_wm_setcaption("hey tetris!", null); homecoming true; } bool clean_up() { sdl_quit(); } void show_blocks () { sdl_surface *s = sdl_creatergbsurface(sdl_swsurface, block_length, block_length, 32, 0x0, 0x0, 0x0, 0x0); (int = 0; < blocks.size(); i++) { uint64 bcolor; switch (blocks[i].c) { case bluish : bcolor = 0x0000ff; break; case cyan : bcolor = 0x00ffff; break; case white : bcolor = 0xffffff; break; case yellowish : bcolor = 0xffff00; break; case reddish : bcolor = 0xff0000; break; case magenta : bcolor = 0xff00ff; break; case greenish : bcolor = 0x00ff00; break; } sdl_fillrect(s, null, bcolor); apply_surface(s, screen, blocks[i].l.x * block_length, blocks[i].l.y * block_length); } sdl_freesurface(s); }

at first glance, came question: sdl_rect in apply_surface() set correctly? setting x , y without width , height gives rect undefined size due stack trash because rect not zeroed default constructor afaik. i'd set these members equal source, so:

o.x = x; o.y = y; o.w = source->w; o.h = source->h;

c++ sdl

Comments

Post a Comment

Popular posts from this blog

How do I check if an insert was successful with MySQLdb in Python? -

-
How do I check if an insert was successful with MySQLdb in Python? - i have code: cursor = conn.cursor() cursor.execute(("insert new_files (videos_id, filename, " "is_processing) values (%s,%s,1)"), (id, filename)) logging.warn("%d", cursor.rowcount) if (cursor.rowcount == 1): logging.info("inserted values %d, %s", id, filename) else: logging.warn("failed insert values %d, %s", id, filename) cursor.close() fun is, cursor.rowcount always one, though updated database create videos_id unique key. is, insert fails because in tests same videos_id going appear (and when check database, nil inserted). whatever reason, rowcount 1 - logging.warn have spits out rowcount of 1. so, question: can utilize rowcount work out if insert went fine? if so, (presumably) doing wrong? otherwise, how check if insert went fine? your code not commit after modifications (your modifications rolled back). should...
Read more

delphi - blogger via idHTTP : error 400 bad request -

-
delphi - blogger via idHTTP : error 400 bad request - i'm trying post blogger using idhttp component, however, i'm getting "http/1.0 400 bad request" error. procedure tform1.button1click(sender: tobject); var request,response,req : tstringlist; auth,blogid : string; begin blogid := '00000000000000000000000'; request := tstringlist.create; response := tstringlist.create; req := tstringlist.create; idhttp1.request.connection := 'keep-alive'; idhttp1.request.contenttype := 'application/x-www-form-urlencoded'; idssliohandlersocket1.ssloptions.method := sslvsslv23; request.clear(); request.values['accounttype'] := 'google'; request.values['email'] := 'xxx@gmail.com'; request.values['passwd'] := 'yyy'; request.values['service'] := 'blogger'; response.text :=idhttp1.post('https://www.google.com/accounts/clientlogin',request); auth := resp...
Read more

postgresql - ERROR: operator is not unique: unknown + unknown -

-
postgresql - ERROR: operator is not unique: unknown + unknown - i have postgis database , have compute new values rows in new column. these values should average of values of several columns. query: insert bdps (da_m) values (avg('da_1'+'da_2'+'da_3'+'da_4'+'da_5'+'da_6'+'da_7')); in query bdps database, da_m new column , da_1 da_7 existing columns have double precision type. da_m created using alter table bdps add together column da_m double precision; i next error: error: operator not unique: unknown + unknown line 2: values (avg('da_1'+'da_2'+'da_3'+'da_4'+'da_5'+'da_6'+'da_7... ^ hint: not take best candidate operator. might need add together explicit type casts. ********** error ********** error: operator not unique: unknown + unknown sql state: 42725 hint: not take best candidate operator. might need add togethe...
Read more