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Merge pull request #459 from bmuessig/master

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Added working filled and outlined arc drawing to GDI binding
This commit is contained in:
Rob Loach 2022-05-12 11:00:39 -04:00 committed by GitHub
commit 0a77211844
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 76 additions and 3 deletions
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79
demo/gdi/nuklear_gdi.h
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@ -15,6 +15,7 @@
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <wingdi.h>
typedef struct GdiFont GdiFont;
NK_API struct nk_context* nk_gdi_init(GdiFont *font, HDC window_dc, unsigned int width, unsigned int height);
@ -391,6 +392,62 @@ nk_gdi_stroke_polyline(HDC dc, const struct nk_vec2i *pnts,
}
}
static void
nk_gdi_stroke_arc(HDC dc, short cx, short cy, unsigned short r, float amin, float adelta, unsigned short line_thickness, struct nk_color col)
{
COLORREF color = convert_color(col);
/* setup pen */
HPEN pen = NULL;
if (line_thickness == 1)
SetDCPenColor(dc, color);
else
{
/* the flat endcap makes thick arcs look better */
DWORD pen_style = PS_SOLID | PS_ENDCAP_FLAT | PS_GEOMETRIC;
LOGBRUSH brush;
brush.lbStyle = BS_SOLID;
brush.lbColor = color;
brush.lbHatch = 0;
pen = ExtCreatePen(pen_style, line_thickness, &brush, 0, NULL);
SelectObject(dc, pen);
}
/* calculate arc and draw */
int start_x = cx + (int) ((float)r*nk_cos(amin+adelta)),
start_y = cy + (int) ((float)r*nk_sin(amin+adelta)),
end_x = cx + (int) ((float)r*nk_cos(amin)),
end_y = cy + (int) ((float)r*nk_sin(amin));
HGDIOBJ br = SelectObject(dc, GetStockObject(NULL_BRUSH));
SetArcDirection(dc, AD_COUNTERCLOCKWISE);
Pie(dc, cx-r, cy-r, cx+r, cy+r, start_x, start_y, end_x, end_y);
SelectObject(dc, br);
if (pen)
{
SelectObject(dc, GetStockObject(DC_PEN));
DeleteObject(pen);
}
}
static void
nk_gdi_fill_arc(HDC dc, short cx, short cy, unsigned short r, float amin, float adelta, struct nk_color col)
{
COLORREF color = convert_color(col);
SetDCBrushColor(dc, color);
SetDCPenColor(dc, color);
int start_x = cx + (int) ((float)r*nk_cos(amin+adelta)),
start_y = cy + (int) ((float)r*nk_sin(amin+adelta)),
end_x = cx + (int) ((float)r*nk_cos(amin)),
end_y = cy + (int) ((float)r*nk_sin(amin));
Pie(dc, cx-r, cy-r, cx+r, cy+r, start_x, start_y, end_x, end_y);
}
static void
nk_gdi_fill_circle(HDC dc, short x, short y, unsigned short w,
unsigned short h, struct nk_color col)
@ -413,9 +470,11 @@ nk_gdi_stroke_circle(HDC dc, short x, short y, unsigned short w,
pen = CreatePen(PS_SOLID, line_thickness, color);
SelectObject(dc, pen);
}
HGDIOBJ br = SelectObject(dc, GetStockObject(NULL_BRUSH));
SetDCBrushColor(dc, OPAQUE);
Ellipse(dc, x, y, x + w, y + h);
SelectObject(dc, br);
if (pen) {
SelectObject(dc, GetStockObject(DC_PEN));
@ -716,6 +775,13 @@ nk_gdi_handle_event(HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam)
case VK_PRIOR:
nk_input_key(&gdi.ctx, NK_KEY_SCROLL_UP, down);
return 1;
case 'A':
if (ctrl) {
nk_input_key(&gdi.ctx, NK_KEY_TEXT_SELECT_ALL, down);
return 1;
}
break;
case 'C':
if (ctrl) {
@ -859,6 +925,14 @@ nk_gdi_render(struct nk_color clear)
const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
nk_gdi_fill_circle(memory_dc, c->x, c->y, c->w, c->h, c->color);
} break;
case NK_COMMAND_ARC: {
const struct nk_command_arc *q = (const struct nk_command_arc *)cmd;
nk_gdi_stroke_arc(memory_dc, q->cx, q->cy, q->r, q->a[0], q->a[1], q->line_thickness, q->color);
} break;
case NK_COMMAND_ARC_FILLED: {
const struct nk_command_arc_filled *q = (const struct nk_command_arc_filled *)cmd;
nk_gdi_fill_arc(memory_dc, q->cx, q->cy, q->r, q->a[0], q->a[1], q->color);
} break;
case NK_COMMAND_TRIANGLE: {
const struct nk_command_triangle*t = (const struct nk_command_triangle*)cmd;
nk_gdi_stroke_triangle(memory_dc, t->a.x, t->a.y, t->b.x, t->b.y,
@ -901,8 +975,7 @@ nk_gdi_render(struct nk_color clear)
const struct nk_command_image *i = (const struct nk_command_image *)cmd;
nk_gdi_draw_image(i->x, i->y, i->w, i->h, i->img, i->col);
} break;
case NK_COMMAND_ARC:
case NK_COMMAND_ARC_FILLED:
case NK_COMMAND_CUSTOM:
default: break;
}
}