diff options
author | ubq323 <ubq323@ubq323.website> | 2024-03-28 18:50:23 +0000 |
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committer | ubq323 <ubq323@ubq323.website> | 2024-03-28 18:50:23 +0000 |
commit | 1762e9f622c7a9045e6ea23a92a81d7dfa5dadda (patch) | |
tree | 78df664636234ccdd8de761bdda65339ed22d441 /client/drawing.ha | |
parent | 52557c8a1c78ee02bd0eda1c740a37f8d6759b0c (diff) |
reörganize
Diffstat (limited to 'client/drawing.ha')
-rw-r--r-- | client/drawing.ha | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/client/drawing.ha b/client/drawing.ha new file mode 100644 index 0000000..e164d33 --- /dev/null +++ b/client/drawing.ha @@ -0,0 +1,100 @@ +use sdl2; +use fmt; + +// 2d position, x and y +export type pos = (i32, i32); + +export type drawing_state = struct { + // is the mouse button held down? + drawing: bool, + pos: pos, + pictures: []picture, +}; + +export type picture = struct { + // the surface data as u32s + d: *[*]u32, + w: size, + h: size, + + // backreference to the surface whose data we're using + surf: *sdl2::SDL_Surface, + + pos: pos, + +}; + +// Returns array index of the pixel at position pos. +// Bounds check happens in here instead of using a slice type, so +// that it's easier to remove later. +export fn pidx(pic: *picture, pos: pos) size = { + const (x,y) = pos; + const (xs,ys) = (x:size, y:size); + assert(0 <= x, "x position must not be less than 0"); + assert(0 <= y, "y position must not be less than 0"); + assert(xs < pic.w, "x position must be less than picture width"); + assert(ys < pic.h, "y position must be less than picture height"); + + return xs + pic.w*ys; +}; + +export fn pic_set(pic: *picture, pos: pos, val: u32) void = + pic.d[pidx(pic,pos)] = val; + +export fn picture_from_surface(surf: *sdl2::SDL_Surface, pos: pos) picture = picture { + w = surf.w: size, + h = surf.h: size, + d = (surf.pixels as *opaque: *[*]u32), + surf = surf, + pos = pos, +}; + +export fn clear_picture(pic: *picture, color: u32) void = { + for (let i = 0z; i < pic.w*pic.h; i+=1) pic.d[i] = color; +}; + +export fn outline_picture(pic: *picture) void = { + for (let x = 0; x:size < pic.w; x+=1) { + pic_set(pic, (x, 0), 0); + pic_set(pic, (x, pic.h:int-1), 0); + }; + for (let y = 0; y:size < pic.h; y+=1) { + pic_set(pic, (0, y), 0); + pic_set(pic, (pic.w:int-1, y), 0); + }; +}; + +fn min(a: i32, b: i32) i32 = if (a<b) a else b; +fn max(a: i32, b: i32) i32 = if (a<b) b else a; + +// Draws a circle onto the picture, at given position radius color +// Clips at the boundaries of the picture to avoid overflow. +export fn circle(picture: *picture, c: pos, r: i32, color: u32) void = { + // fmt::printfln("C {} {} {} {:x}",c.0,c.1,r,color)!; + const (cx,cy) = c; + const ymin = max(0, cy-r); + const ymax = min(picture.h:i32-1, cy+r); + const xmin = max(0, cx-r); + const xmax = min(picture.w:i32-1, cx+r); + + const r2 = r*r + r; + + for (let y = ymin; y<=ymax; y+=1) { + const yd = y-cy; + for (let x = xmin; x<=xmax; x+=1) { + const xd = x-cx; + if (yd*yd + xd*xd <= r2) { + pic_set(picture, (x,y), color); + }; + }; + }; +}; + +export fn do_drawing(dstate: *drawing_state) void = { + if (dstate.drawing) for (let i = 0z; i < 4; i+=1) { + const pic = &dstate.pictures[i]; + const p = (dstate.pos.0 - pic.pos.0, dstate.pos.1 - pic.pos.1); + circle(pic, p, 20, 0xff0088); + }; +}; + |