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Update canvas example with background color arg 

`nk_canvas_begin` now takes a background color directly instead of
requiring the user of the API to clear the window background with
another draw call.
This commit is contained in:
vurtun 2016-08-26 19:48:04 +02:00
parent d4625dc9c1
commit 727b912390
1 changed files with 15 additions and 5 deletions
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20
example/canvas.c
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@ -337,19 +337,29 @@ struct nk_canvas {
struct nk_command_buffer *painter;
struct nk_vec2 item_spacing;
struct nk_vec2 panel_padding;
struct nk_style_item window_background;
};
static void
canvas_begin(struct nk_context *ctx, struct nk_canvas *canvas, int x, int y, int width, int height)
canvas_begin(struct nk_context *ctx, struct nk_canvas *canvas, nk_flags flags,
int x, int y, int width, int height, struct nk_color background_color)
{
/* save style properties which will be overwritten */
canvas->panel_padding = ctx->style.window.padding;
canvas->item_spacing = ctx->style.window.spacing;
canvas->window_background = ctx->style.window.fixed_background;
/* use the complete window space and set background */
ctx->style.window.spacing = nk_vec2(0,0);
ctx->style.window.padding = nk_vec2(0,0);
ctx->style.window.fixed_background = nk_style_item_color(background_color);
nk_begin(ctx, &canvas->layout, "Window", nk_rect(x, y, width, height), NK_WINDOW_NO_SCROLLBAR);
/* create/update window and set position + size */
flags = flags & ~NK_WINDOW_DYNAMIC;
nk_begin(ctx, &canvas->layout, "Window", nk_rect(x, y, width, height), NK_WINDOW_NO_SCROLLBAR|flags);
nk_window_set_bounds(ctx, nk_rect(x, y, width, height));
/* allocate the complete window space for drawing */
{struct nk_rect total_space;
total_space = nk_window_get_content_region(ctx);
nk_layout_row_dynamic(ctx, total_space.h, 1);
@ -363,6 +373,7 @@ canvas_end(struct nk_context *ctx, struct nk_canvas *canvas)
nk_end(ctx);
ctx->style.window.spacing = canvas->panel_padding;
ctx->style.window.padding = canvas->item_spacing;
ctx->style.window.fixed_background = canvas->window_background;
}
int main(int argc, char *argv[])
@ -420,9 +431,8 @@ int main(int argc, char *argv[])
/* draw */
{struct nk_canvas canvas;
canvas_begin(&ctx, &canvas, 0, 0, width, height);
canvas_begin(&ctx, &canvas, 0, 0, 0, width, height, nk_rgb(250,250,250));
{
nk_fill_rect(canvas.painter, nk_rect(0,0,width,height), 0, nk_rgb(150,150,150));
nk_fill_rect(canvas.painter, nk_rect(15,15,210,210), 5, nk_rgb(247, 230, 154));
nk_fill_rect(canvas.painter, nk_rect(20,20,200,200), 5, nk_rgb(188, 174, 118));
nk_draw_text(canvas.painter, nk_rect(30, 30, 150, 20), "Text to draw", 12, &font->handle, nk_rgb(188,174,118), nk_rgb(0,0,0));
@ -438,7 +448,7 @@ int main(int argc, char *argv[])
points[6] = 200; points[7] = 300;
points[8] = 175; points[9] = 350;
points[10] = 150; points[11] = 350;
nk_fill_polygon(canvas.painter, points, 6, nk_rgb(255,255,255));}
nk_fill_polygon(canvas.painter, points, 6, nk_rgb(0,0,0));}
nk_stroke_line(canvas.painter, 15, 10, 200, 10, 2.0f, nk_rgb(189,45,75));
nk_stroke_rect(canvas.painter, nk_rect(370, 20, 100, 100), 10, 3, nk_rgb(0,0,255));