用SDL2实现雨点下落的结果，本人小白，是按照视频一步步来写的，不知道哪里出错了
本来是雨水一点点往下落的效果，为什么变成了面条一样的呢？求解释，求修改
素材图片是BMP格式的，无法上传， balck.bmp 是一个黑色的小点，用来做覆盖背景，circle是一个白色的圆，圆的不用的杂色的RGB是149,149,149.
大神们有空帮我跑一跑找找错误 啊
#include<SDL.h>
#include<iostream>
#define WINDOW_HEIGHT 600
#define WINDOW_WIDTH 800
using namespace std;
typedef struct {
int x;
int y;
int r;
int speed;
}Spot;
void moveSpot(Spot* spot){
spot->y += spot->speed;
if(spot->y >= WINDOW_HEIGHT){
spot->y = 0;
}
}
void drawSpot(Spot *spot, SDL_Renderer *rend ,SDL_Texture *circle){
SDL_Rect rect;
rect.x = spot->x;
rect.y = spot->y;
rect.w = spot->r;
rect.h = spot->r;
SDL_RenderCopy(rend, circle, NULL , &rect);
}
int main( int argc ,char ** argv)
{
/*
窗口创建
*/
SDL_Window *window = SDL_CreateWindow("meteor",
SDL_WINDOWPOS_UNDEFINED,SDL_WINDOWPOS_UNDEFINED,
WINDOW_WIDTH,WINDOW_HEIGHT,
SDL_WINDOW_SHOWN
);
/*渲染器初始化*/
SDL_Renderer* rend = SDL_CreateRenderer(window, -1 ,SDL_RENDERER_ACCELERATED );
/*加载图片*/
SDL_Surface * blackSurface = SDL_LoadBMP("balck.bmp");
SDL_Surface * circleSurface = SDL_LoadBMP("circle.bmp");
/*除杂色*/
SDL_SetColorKey(circleSurface, SDL_TRUE, SDL_MapRGB(circleSurface->format,149,149,149));
/*设置纹理*/
SDL_Texture *black = SDL_CreateTextureFromSurface(rend,blackSurface);
SDL_Texture *circle = SDL_CreateTextureFromSurface(rend,circleSurface);
/*位置矩形*/
SDL_Rect rectWindow;
rectWindow.x = 0;
rectWindow.y = 0;
rectWindow.w = WINDOW_WIDTH;
rectWindow.h = WINDOW_HEIGHT;
SDL_Rect rectCircle;
rectCircle.x = 0;
rectCircle.y = 0;
rectCircle.w = 5;
rectCircle.h = 5;
bool quit = false;
//初始化50个白点
Spot spots[50];
for (int i = 0; i < 50; i++)
{
spots[i].x = rand()%WINDOW_WIDTH;
spots[i].y = rand()%WINDOW_HEIGHT;
spots[i].r = 4;
spots[i].speed = rand() % 2 +1;
}
SDL_Event event;
while(!quit){
while(SDL_PollEvent(&event)){
if(event.type == SDL_QUIT){
quit = true;
}
}
SDL_RenderCopy(rend, black, NULL , &rectWindow);
/*画点*/
for (int i = 0; i < 50; i++)
{
drawSpot(&spots[i],rend,circle);
moveSpot(&spots[i]);
}
SDL_RenderPresent(rend);
SDL_Delay(5);
}
SDL_DestroyWindow(window);
return 0;
}
我把文件和代码贴出来，大神们帮我看看哇！求帮修改，谢谢各位大神啦！！
