C++ (Cpp) fz_add_arc Examples

Example #1

File: draw_path.c Project: DavidWiberg/sumatrapdf

static void
fz_add_line_join(struct sctx *s, fz_point a, fz_point b, fz_point c, int join_under)
{
	float miterlimit = s->miterlimit;
	float linewidth = s->linewidth;
	fz_linejoin linejoin = s->linejoin;
	float dx0, dy0;
	float dx1, dy1;
	float dlx0, dly0;
	float dlx1, dly1;
	float dmx, dmy;
	float dmr2;
	float scale;
	float cross;
	float len0, len1;

	dx0 = b.x - a.x;
	dy0 = b.y - a.y;

	dx1 = c.x - b.x;
	dy1 = c.y - b.y;

	cross = dx1 * dy0 - dx0 * dy1;
	/* Ensure that cross >= 0 */
	if (cross < 0)
	{
		float tmp;
		tmp = dx1; dx1 = -dx0; dx0 = -tmp;
		tmp = dy1; dy1 = -dy0; dy0 = -tmp;
		cross = -cross;
	}

	len0 = dx0 * dx0 + dy0 * dy0;
	if (len0 < FLT_EPSILON)
		linejoin = FZ_LINEJOIN_BEVEL;
	len1 = dx1 * dx1 + dy1 * dy1;
	if (len1 < FLT_EPSILON)
		linejoin = FZ_LINEJOIN_BEVEL;

	scale = linewidth / sqrtf(len0);
	dlx0 = dy0 * scale;
	dly0 = -dx0 * scale;

	scale = linewidth / sqrtf(len1);
	dlx1 = dy1 * scale;
	dly1 = -dx1 * scale;

	dmx = (dlx0 + dlx1) * 0.5f;
	dmy = (dly0 + dly1) * 0.5f;
	dmr2 = dmx * dmx + dmy * dmy;

	if (cross * cross < FLT_EPSILON && dx0 * dx1 + dy0 * dy1 >= 0)
		linejoin = FZ_LINEJOIN_BEVEL;

	if (join_under)
	{
		fz_add_line(s, b.x + dlx1, b.y + dly1, b.x + dlx0, b.y + dly0);
	}
	else
	{
		fz_add_line(s, b.x + dlx1, b.y + dly1, b.x, b.y);
		fz_add_line(s, b.x, b.y, b.x + dlx0, b.y + dly0);
	}

	/* XPS miter joins are clipped at miterlength, rather than simply
	 * being converted to bevelled joins. */
	if (linejoin == FZ_LINEJOIN_MITER_XPS)
	{
		if (cross == 0)
			linejoin = FZ_LINEJOIN_BEVEL;
		else if (dmr2 * miterlimit * miterlimit >= linewidth * linewidth)
			linejoin = FZ_LINEJOIN_MITER;
		else
		{
			float k, t0x, t0y, t1x, t1y;
			scale = linewidth * linewidth / dmr2;
			dmx *= scale;
			dmy *= scale;
			k = (scale - linewidth * miterlimit / sqrtf(dmr2)) / (scale - 1);
			t0x = b.x - dmx + k * (dmx - dlx0);
			t0y = b.y - dmy + k * (dmy - dly0);
			t1x = b.x - dmx + k * (dmx - dlx1);
			t1y = b.y - dmy + k * (dmy - dly1);

			fz_add_line(s, b.x - dlx0, b.y - dly0, t0x, t0y);
			fz_add_line(s, t0x, t0y, t1x, t1y);
			fz_add_line(s, t1x, t1y, b.x - dlx1, b.y - dly1);
		}
	}
	else if (linejoin == FZ_LINEJOIN_MITER)
		if (dmr2 * miterlimit * miterlimit < linewidth * linewidth)
			linejoin = FZ_LINEJOIN_BEVEL;

	if (linejoin == FZ_LINEJOIN_MITER)
	{
		scale = linewidth * linewidth / dmr2;
		dmx *= scale;
		dmy *= scale;

		fz_add_line(s, b.x - dlx0, b.y - dly0, b.x - dmx, b.y - dmy);
		fz_add_line(s, b.x - dmx, b.y - dmy, b.x - dlx1, b.y - dly1);
	}

	if (linejoin == FZ_LINEJOIN_BEVEL)
	{
		fz_add_line(s, b.x - dlx0, b.y - dly0, b.x - dlx1, b.y - dly1);
	}

	if (linejoin == FZ_LINEJOIN_ROUND)
	{
		fz_add_arc(s, b.x, b.y, -dlx0, -dly0, -dlx1, -dly1);
	}
}

Example #2

File: draw_path.c Project: DeepGopani/mupdf

static void
fz_add_line_join(struct sctx *s, fz_point a, fz_point b, fz_point c)
{
	float miterlimit = s->miterlimit;
	float linewidth = s->linewidth;
	int linejoin = s->linejoin;
	float dx0, dy0;
	float dx1, dy1;
	float dlx0, dly0;
	float dlx1, dly1;
	float dmx, dmy;
	float dmr2;
	float scale;
	float cross;

	dx0 = b.x - a.x;
	dy0 = b.y - a.y;

	dx1 = c.x - b.x;
	dy1 = c.y - b.y;

	if (dx0 * dx0 + dy0 * dy0 < FLT_EPSILON)
		linejoin = BEVEL;
	if (dx1 * dx1 + dy1 * dy1 < FLT_EPSILON)
		linejoin = BEVEL;

	scale = linewidth / sqrtf(dx0 * dx0 + dy0 * dy0);
	dlx0 = dy0 * scale;
	dly0 = -dx0 * scale;

	scale = linewidth / sqrtf(dx1 * dx1 + dy1 * dy1);
	dlx1 = dy1 * scale;
	dly1 = -dx1 * scale;

	cross = dx1 * dy0 - dx0 * dy1;

	dmx = (dlx0 + dlx1) * 0.5f;
	dmy = (dly0 + dly1) * 0.5f;
	dmr2 = dmx * dmx + dmy * dmy;

	if (cross * cross < FLT_EPSILON && dx0 * dx1 + dy0 * dy1 >= 0)
		linejoin = BEVEL;

	if (linejoin == MITER)
		if (dmr2 * miterlimit * miterlimit < linewidth * linewidth)
			linejoin = BEVEL;

	if (linejoin == BEVEL)
	{
		fz_add_line(s, b.x - dlx0, b.y - dly0, b.x - dlx1, b.y - dly1);
		fz_add_line(s, b.x + dlx1, b.y + dly1, b.x + dlx0, b.y + dly0);
	}

	if (linejoin == MITER)
	{
		scale = linewidth * linewidth / dmr2;
		dmx *= scale;
		dmy *= scale;

		if (cross < 0)
		{
			fz_add_line(s, b.x - dlx0, b.y - dly0, b.x - dlx1, b.y - dly1);
			fz_add_line(s, b.x + dlx1, b.y + dly1, b.x + dmx, b.y + dmy);
			fz_add_line(s, b.x + dmx, b.y + dmy, b.x + dlx0, b.y + dly0);
		}
		else
		{
			fz_add_line(s, b.x + dlx1, b.y + dly1, b.x + dlx0, b.y + dly0);
			fz_add_line(s, b.x - dlx0, b.y - dly0, b.x - dmx, b.y - dmy);
			fz_add_line(s, b.x - dmx, b.y - dmy, b.x - dlx1, b.y - dly1);
		}
	}

	if (linejoin == ROUND)
	{
		if (cross < 0)
		{
			fz_add_line(s, b.x - dlx0, b.y - dly0, b.x - dlx1, b.y - dly1);
			fz_add_arc(s, b.x, b.y, dlx1, dly1, dlx0, dly0);
		}
		else
		{
			fz_add_line(s, b.x + dlx1, b.y + dly1, b.x + dlx0, b.y + dly0);
			fz_add_arc(s, b.x, b.y, -dlx0, -dly0, -dlx1, -dly1);
		}
	}
}