How to draw a dashed line?

Question

I need to draw a dashed line(for pong) using SDL. I want to do it in a for loop because making and rendering 10 different rectangles costs too many lines of code. So just for clearness, not this:

SDL_Rect pieceOfLine = {x,y,w,h};
SDL_Rect pieceOfLine1 = {x,y,w,h};
SDL_Rect pieceOfLine2 = {x,y,w,h};

etc.

But sort of this(I tried this but it didn't work):

SDL_Rect line = {x,y,w,h};
for(int i = 0 ; i < 10 ; i++){
    SDL_RenderFillRect(renderer,&line);
    line.y += 30; //So actually a line with holes in it
}

I hope I was clear enough, thanks in advance and sorry for bad English. This is an example of what I actually need(In my program):

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Answer 1

您的方法看起来不错，但是您需要使h等于15，否则您将在彼此之上绘制10条线，并稍微偏移。