GWIN Graph - use GDISP point definition

1 files changed, 362 insertions, 362 deletions

diff --git a/src/gwin/graph.c b/src/gwin/graph.c
index 89876584..eff42eb1 100644
--- a/src/gwin/graph.c
+++ b/src/gwin/graph.c
@@ -1,362 +1,362 @@
-/*

-    ChibiOS/GFX - Copyright (C) 2012, 2013

-                 Joel Bodenmann aka Tectu <joel@unormal.org>

-

-    This file is part of ChibiOS/GFX.

-

-    ChibiOS/GFX is free software; you can redistribute it and/or modify

-    it under the terms of the GNU General Public License as published by

-    the Free Software Foundation; either version 3 of the License, or

-    (at your option) any later version.

-

-    ChibiOS/GFX is distributed in the hope that it will be useful,

-    but WITHOUT ANY WARRANTY; without even the implied warranty of

-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-    GNU General Public License for more details.

-

-    You should have received a copy of the GNU General Public License

-    along with this program.  If not, see <http://www.gnu.org/licenses/>.

-*/

-/**

- * @file    src/gwin/graph.c

- * @brief   GWIN sub-system button code.

- *

- * @defgroup Graph Graph

- * @ingroup GWIN

- *

- * @{

- */

-

-#include "ch.h"

-#include "hal.h"

-#include "gfx.h"

-

-#if (GFX_USE_GWIN && GWIN_NEED_GRAPH) || defined(__DOXYGEN__)

-

-#include "gwin/internal.h"

-

-#define GGRAPH_FLG_CONNECTPOINTS			(GWIN_FIRST_CONTROL_FLAG<<0)

-#define GGRAPH_ARROW_SIZE					5

-

-static const GGraphStyle GGraphDefaultStyle = {

-	{ GGRAPH_POINT_DOT, 0, White },			// point

-	{ GGRAPH_LINE_DOT, 2, Gray },			// line

-	{ GGRAPH_LINE_SOLID, 0, White },		// x axis

-	{ GGRAPH_LINE_SOLID, 0, White },		// y axis

-	{ GGRAPH_LINE_NONE, 0, White, 0 },		// x grid

-	{ GGRAPH_LINE_NONE, 0, White, 0 },		// y grid

-	GWIN_GRAPH_STYLE_XAXIS_ARROWS|GWIN_GRAPH_STYLE_YAXIS_ARROWS		// flags

-};

-

-static void pointto(GGraphObject *gg, coord_t x, coord_t y, const GGraphPointStyle *style) {

-	if (style->type == GGRAPH_POINT_NONE)

-		return;

-

-	// Convert to device space. Note the y-axis is inverted.

-	x += gg->gwin.x + gg->xorigin;

-	y = gg->gwin.y + gg->gwin.height - 1 - gg->yorigin - y;

-

-	if (style->size <= 1) {

-		gdispDrawPixel(x, y, style->color);

-		return;

-	}

-

-	switch(style->type) {

-	case GGRAPH_POINT_SQUARE:

-		gdispDrawBox(x-style->size, y-style->size, 2*style->size, 2*style->size, style->color);

-		break;

-#if GDISP_NEED_CIRCLE

-	case GGRAPH_POINT_CIRCLE:

-		gdispDrawCircle(x, y, style->size, style->color);

-		break;

-#endif

-	case GGRAPH_POINT_DOT:

-	default:

-		gdispDrawPixel(x, y, style->color);

-		break;

-	}

-}

-

-static void lineto(GGraphObject *gg, coord_t x0, coord_t y0, coord_t x1, coord_t y1, const GGraphLineStyle *style) {

-	coord_t	dy, dx;

-	coord_t addx, addy;

-	coord_t P, diff, i;

-	coord_t	run_on, run_off, run;

-

-	if (style->type == GGRAPH_LINE_NONE)

-		return;

-

-	// Convert to device space. Note the y-axis is inverted.

-	x0 += gg->gwin.x + gg->xorigin;

-	y0 = gg->gwin.y + gg->gwin.height - 1 - gg->yorigin - y0;

-	x1 += gg->gwin.x + gg->xorigin;

-	y1 = gg->gwin.y + gg->gwin.height - 1 - gg->yorigin - y1;

-

-	if (style->size <= 0) {

-		// Use the driver to draw a solid line

-		gdispDrawLine(x0, y0, x1, y1, style->color);

-		return;

-	}

-

-	switch (style->type) {

-	case GGRAPH_LINE_DOT:

-		run_on = 1;

-		run_off = -style->size;

-		break;

-

-	case GGRAPH_LINE_DASH:

-		run_on = style->size;

-		run_off = -style->size;

-		break;

-

-	case GGRAPH_LINE_SOLID:

-	default:

-		// Use the driver to draw a solid line

-		gdispDrawLine(x0, y0, x1, y1, style->color);

-		return;

-	}

-

-	// Use Bresenham's algorithm modified to draw a stylized line

-	run = 0;

-	if (x1 >= x0) {

-		dx = x1 - x0;

-		addx = 1;

-	} else {

-		dx = x0 - x1;

-		addx = -1;

-	}

-	if (y1 >= y0) {

-		dy = y1 - y0;

-		addy = 1;

-	} else {

-		dy = y0 - y1;

-		addy = -1;

-	}

-

-	if (dx >= dy) {

-		dy *= 2;

-		P = dy - dx;

-		diff = P - dx;

-

-		for(i=0; i<=dx; ++i) {

-			if (run++ >= 0) {

-				if (run >= run_on)

-					run = run_off;

-				gdispDrawPixel(x0, y0, style->color);

-			}

-			if (P < 0) {

-				P  += dy;

-				x0 += addx;

-			} else {

-				P  += diff;

-				x0 += addx;

-				y0 += addy;

-			}

-		}

-	} else {

-		dx *= 2;

-		P = dx - dy;

-		diff = P - dy;

-

-		for(i=0; i<=dy; ++i) {

-			if (run++ >= 0) {

-				if (run >= run_on)

-					run = run_off;

-				gdispDrawPixel(x0, y0, style->color);

-			}

-			if (P < 0) {

-				P  += dx;

-				y0 += addy;

-			} else {

-				P  += diff;

-				x0 += addx;

-				y0 += addy;

-			}

-		}

-	}

-}

-

-GHandle gwinCreateGraph(GGraphObject *gg, coord_t x, coord_t y, coord_t width, coord_t height) {

-	if (!(gg = (GGraphObject *)_gwinInit((GWindowObject *)gg, x, y, width, height, sizeof(GGraphObject))))

-		return 0;

-	gg->gwin.type = GW_GRAPH;

-	gg->xorigin = gg->yorigin = 0;

-	gg->lastx = gg->lasty = 0;

-	gwinGraphSetStyle(&gg->gwin, &GGraphDefaultStyle);

-	return (GHandle)gg;

-}

-

-void gwinGraphSetStyle(GHandle gh, const GGraphStyle *pstyle) {

-	#define gg	((GGraphObject *)gh)

-

-	if (gh->type != GW_GRAPH)

-		return;

-

-	gg->style.point.type = pstyle->point.type;

-	gg->style.point.size = pstyle->point.size;

-	gg->style.point.color = pstyle->point.color;

-	gg->style.line.type = pstyle->line.type;

-	gg->style.line.size = pstyle->line.size;

-	gg->style.line.color = pstyle->line.color;

-	gg->style.xaxis.type = pstyle->xaxis.type;

-	gg->style.xaxis.size = pstyle->xaxis.size;

-	gg->style.xaxis.color = pstyle->xaxis.color;

-	gg->style.yaxis.type = pstyle->yaxis.type;

-	gg->style.yaxis.size = pstyle->yaxis.size;

-	gg->style.yaxis.color = pstyle->yaxis.color;

-	gg->style.xgrid.type = pstyle->xgrid.type;

-	gg->style.xgrid.size = pstyle->xgrid.size;

-	gg->style.xgrid.color = pstyle->xgrid.color;

-	gg->style.xgrid.spacing = pstyle->xgrid.spacing;

-	gg->style.ygrid.type = pstyle->ygrid.type;

-	gg->style.ygrid.size = pstyle->ygrid.size;

-	gg->style.ygrid.color = pstyle->ygrid.color;

-	gg->style.ygrid.spacing = pstyle->ygrid.spacing;

-	gg->style.flags = pstyle->flags;

-

-	#undef gg

-}

-

-void gwinGraphSetOrigin(GHandle gh, coord_t x, coord_t y) {

-	#define gg	((GGraphObject *)gh)

-

-	if (gh->type != GW_GRAPH)

-		return;

-

-	gg->xorigin = x;

-	gg->yorigin = y;

-

-	#undef gg

-}

-

-void gwinGraphDrawAxis(GHandle gh) {

-	#define gg	((GGraphObject *)gh)

-	coord_t		i, xmin, ymin, xmax, ymax;

-

-	if (gh->type != GW_GRAPH)

-		return;

-

-	xmin = -gg->xorigin;

-	xmax = gh->width-gg->xorigin-1;

-	ymin = -gg->yorigin;

-	ymax = gh->height-gg->yorigin-1;

-

-	// x grid - this code assumes that the GGraphGridStyle is a superset of GGraphListStyle

-	if (gg->style.xgrid.type != GGRAPH_LINE_NONE && gg->style.xgrid.spacing >= 2) {

-		for(i = gg->style.xgrid.spacing; i <= xmax; i += gg->style.xgrid.spacing)

-			lineto(gg, i, ymin, i, ymax, (GGraphLineStyle *)&gg->style.xgrid);

-		for(i = -gg->style.xgrid.spacing; i >= xmin; i -= gg->style.xgrid.spacing)

-			lineto(gg, i, ymin, i, ymax, (GGraphLineStyle *)&gg->style.xgrid);

-	}

-

-	// y grid - this code assumes that the GGraphGridStyle is a superset of GGraphListStyle

-	if (gg->style.ygrid.type != GGRAPH_LINE_NONE && gg->style.ygrid.spacing >= 2) {

-		for(i = gg->style.ygrid.spacing; i <= ymax; i += gg->style.ygrid.spacing)

-			lineto(gg, xmin, i, xmax, i, (GGraphLineStyle *)&gg->style.ygrid);

-		for(i = -gg->style.ygrid.spacing; i >= ymin; i -= gg->style.ygrid.spacing)

-			lineto(gg, xmin, i, xmax, i, (GGraphLineStyle *)&gg->style.ygrid);

-	}

-

-	// x axis

-	lineto(gg, xmin, 0, xmax, 0, &gg->style.xaxis);

-	if ((gg->style.flags & GWIN_GRAPH_STYLE_XAXIS_NEGATIVE_ARROWS)) {

-		if (xmin > 0 || xmin < -(GGRAPH_ARROW_SIZE+1)) {

-			lineto(gg, xmin, 0, xmin+GGRAPH_ARROW_SIZE, GGRAPH_ARROW_SIZE, &gg->style.xaxis);

-			lineto(gg, xmin, 0, xmin+GGRAPH_ARROW_SIZE, -GGRAPH_ARROW_SIZE, &gg->style.xaxis);

-		}

-	}

-	if ((gg->style.flags & GWIN_GRAPH_STYLE_XAXIS_POSITIVE_ARROWS)) {

-		if (xmax < 0 || xmax > (GGRAPH_ARROW_SIZE+1)) {

-			lineto(gg, xmax, 0, xmax-GGRAPH_ARROW_SIZE, GGRAPH_ARROW_SIZE, &gg->style.xaxis);

-			lineto(gg, xmax, 0, xmax-GGRAPH_ARROW_SIZE, -GGRAPH_ARROW_SIZE, &gg->style.xaxis);

-		}

-	}

-

-	// y axis

-	lineto(gg, 0, ymin, 0, ymax, &gg->style.yaxis);

-	if ((gg->style.flags & GWIN_GRAPH_STYLE_YAXIS_NEGATIVE_ARROWS)) {

-		if (ymin > 0 || ymin < -(GGRAPH_ARROW_SIZE+1)) {

-			lineto(gg, 0, ymin, GGRAPH_ARROW_SIZE, ymin+GGRAPH_ARROW_SIZE, &gg->style.yaxis);

-			lineto(gg, 0, ymin, -GGRAPH_ARROW_SIZE, ymin+GGRAPH_ARROW_SIZE, &gg->style.yaxis);

-		}

-	}

-	if ((gg->style.flags & GWIN_GRAPH_STYLE_YAXIS_POSITIVE_ARROWS)) {

-		if (ymax < 0 || ymax > (GGRAPH_ARROW_SIZE+1)) {

-			lineto(gg, 0, ymax, GGRAPH_ARROW_SIZE, ymax-GGRAPH_ARROW_SIZE, &gg->style.yaxis);

-			lineto(gg, 0, ymax, -GGRAPH_ARROW_SIZE, ymax-GGRAPH_ARROW_SIZE, &gg->style.yaxis);

-		}

-	}

-

-	#undef gg

-}

-

-void gwinGraphStartSet(GHandle gh) {

-	if (gh->type != GW_GRAPH)

-		return;

-

-	gh->flags &= ~GGRAPH_FLG_CONNECTPOINTS;

-}

-

-void gwinGraphDrawPoint(GHandle gh, coord_t x, coord_t y) {

-	#define gg	((GGraphObject *)gh)

-

-	if (gh->type != GW_GRAPH)

-		return;

-

-	if ((gh->flags & GGRAPH_FLG_CONNECTPOINTS)) {

-		// Draw the line

-		lineto(gg, gg->lastx, gg->lasty, x, y, &gg->style.line);

-

-		// Redraw the previous point because the line may have overwritten it

-		pointto(gg, gg->lastx, gg->lasty, &gg->style.point);

-

-	} else

-		gh->flags |= GGRAPH_FLG_CONNECTPOINTS;

-

-	// Save this point for next time.

-	gg->lastx = x;

-	gg->lasty = y;

-

-	// Draw this point.

-	pointto(gg, x, y, &gg->style.point);

-

-	#undef gg

-}

-

-void gwinGraphDrawPoints(GHandle gh, const GGraphPoint *points, unsigned count) {

-	#define gg	((GGraphObject *)gh)

-	unsigned			i;

-	const GGraphPoint	*p;

-

-	if (gh->type != GW_GRAPH)

-		return;

-

-	// Draw the connecting lines

-	for(p = points, i = 0; i < count; p++, i++) {

-		if ((gh->flags & GGRAPH_FLG_CONNECTPOINTS)) {

-			// Draw the line

-			lineto(gg, gg->lastx, gg->lasty, p->x, p->y, &gg->style.line);

-

-			// Redraw the previous point because the line may have overwritten it

-			if (i == 0)

-				pointto(gg, gg->lastx, gg->lasty, &gg->style.point);

-

-		} else

-			gh->flags |= GGRAPH_FLG_CONNECTPOINTS;

-

-		// Save this point for next time.

-		gg->lastx = p->x;

-		gg->lasty = p->y;

-	}

-

-

-	// Draw the points.

-	for(p = points, i = 0; i < count; p++, i++)

-		pointto(gg, p->x, p->y, &gg->style.point);

-

-	#undef gg

-}

-

-#endif /* GFX_USE_GWIN && GWIN_NEED_GRAPH */

-/** @} */

-

+/*
+    ChibiOS/GFX - Copyright (C) 2012, 2013
+                 Joel Bodenmann aka Tectu <joel@unormal.org>
+
+    This file is part of ChibiOS/GFX.
+
+    ChibiOS/GFX is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/GFX is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @file    src/gwin/graph.c
+ * @brief   GWIN sub-system button code.
+ *
+ * @defgroup Graph Graph
+ * @ingroup GWIN
+ *
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+#include "gfx.h"
+
+#if (GFX_USE_GWIN && GWIN_NEED_GRAPH) || defined(__DOXYGEN__)
+
+#include "gwin/internal.h"
+
+#define GGRAPH_FLG_CONNECTPOINTS			(GWIN_FIRST_CONTROL_FLAG<<0)
+#define GGRAPH_ARROW_SIZE					5
+
+static const GGraphStyle GGraphDefaultStyle = {
+	{ GGRAPH_POINT_DOT, 0, White },			// point
+	{ GGRAPH_LINE_DOT, 2, Gray },			// line
+	{ GGRAPH_LINE_SOLID, 0, White },		// x axis
+	{ GGRAPH_LINE_SOLID, 0, White },		// y axis
+	{ GGRAPH_LINE_NONE, 0, White, 0 },		// x grid
+	{ GGRAPH_LINE_NONE, 0, White, 0 },		// y grid
+	GWIN_GRAPH_STYLE_XAXIS_ARROWS|GWIN_GRAPH_STYLE_YAXIS_ARROWS		// flags
+};
+
+static void pointto(GGraphObject *gg, coord_t x, coord_t y, const GGraphPointStyle *style) {
+	if (style->type == GGRAPH_POINT_NONE)
+		return;
+
+	// Convert to device space. Note the y-axis is inverted.
+	x += gg->gwin.x + gg->xorigin;
+	y = gg->gwin.y + gg->gwin.height - 1 - gg->yorigin - y;
+
+	if (style->size <= 1) {
+		gdispDrawPixel(x, y, style->color);
+		return;
+	}
+
+	switch(style->type) {
+	case GGRAPH_POINT_SQUARE:
+		gdispDrawBox(x-style->size, y-style->size, 2*style->size, 2*style->size, style->color);
+		break;
+#if GDISP_NEED_CIRCLE
+	case GGRAPH_POINT_CIRCLE:
+		gdispDrawCircle(x, y, style->size, style->color);
+		break;
+#endif
+	case GGRAPH_POINT_DOT:
+	default:
+		gdispDrawPixel(x, y, style->color);
+		break;
+	}
+}
+
+static void lineto(GGraphObject *gg, coord_t x0, coord_t y0, coord_t x1, coord_t y1, const GGraphLineStyle *style) {
+	coord_t	dy, dx;
+	coord_t addx, addy;
+	coord_t P, diff, i;
+	coord_t	run_on, run_off, run;
+
+	if (style->type == GGRAPH_LINE_NONE)
+		return;
+
+	// Convert to device space. Note the y-axis is inverted.
+	x0 += gg->gwin.x + gg->xorigin;
+	y0 = gg->gwin.y + gg->gwin.height - 1 - gg->yorigin - y0;
+	x1 += gg->gwin.x + gg->xorigin;
+	y1 = gg->gwin.y + gg->gwin.height - 1 - gg->yorigin - y1;
+
+	if (style->size <= 0) {
+		// Use the driver to draw a solid line
+		gdispDrawLine(x0, y0, x1, y1, style->color);
+		return;
+	}
+
+	switch (style->type) {
+	case GGRAPH_LINE_DOT:
+		run_on = 1;
+		run_off = -style->size;
+		break;
+
+	case GGRAPH_LINE_DASH:
+		run_on = style->size;
+		run_off = -style->size;
+		break;
+
+	case GGRAPH_LINE_SOLID:
+	default:
+		// Use the driver to draw a solid line
+		gdispDrawLine(x0, y0, x1, y1, style->color);
+		return;
+	}
+
+	// Use Bresenham's algorithm modified to draw a stylized line
+	run = 0;
+	if (x1 >= x0) {
+		dx = x1 - x0;
+		addx = 1;
+	} else {
+		dx = x0 - x1;
+		addx = -1;
+	}
+	if (y1 >= y0) {
+		dy = y1 - y0;
+		addy = 1;
+	} else {
+		dy = y0 - y1;
+		addy = -1;
+	}
+
+	if (dx >= dy) {
+		dy *= 2;
+		P = dy - dx;
+		diff = P - dx;
+
+		for(i=0; i<=dx; ++i) {
+			if (run++ >= 0) {
+				if (run >= run_on)
+					run = run_off;
+				gdispDrawPixel(x0, y0, style->color);
+			}
+			if (P < 0) {
+				P  += dy;
+				x0 += addx;
+			} else {
+				P  += diff;
+				x0 += addx;
+				y0 += addy;
+			}
+		}
+	} else {
+		dx *= 2;
+		P = dx - dy;
+		diff = P - dy;
+
+		for(i=0; i<=dy; ++i) {
+			if (run++ >= 0) {
+				if (run >= run_on)
+					run = run_off;
+				gdispDrawPixel(x0, y0, style->color);
+			}
+			if (P < 0) {
+				P  += dx;
+				y0 += addy;
+			} else {
+				P  += diff;
+				x0 += addx;
+				y0 += addy;
+			}
+		}
+	}
+}
+
+GHandle gwinCreateGraph(GGraphObject *gg, coord_t x, coord_t y, coord_t width, coord_t height) {
+	if (!(gg = (GGraphObject *)_gwinInit((GWindowObject *)gg, x, y, width, height, sizeof(GGraphObject))))
+		return 0;
+	gg->gwin.type = GW_GRAPH;
+	gg->xorigin = gg->yorigin = 0;
+	gg->lastx = gg->lasty = 0;
+	gwinGraphSetStyle(&gg->gwin, &GGraphDefaultStyle);
+	return (GHandle)gg;
+}
+
+void gwinGraphSetStyle(GHandle gh, const GGraphStyle *pstyle) {
+	#define gg	((GGraphObject *)gh)
+
+	if (gh->type != GW_GRAPH)
+		return;
+
+	gg->style.point.type = pstyle->point.type;
+	gg->style.point.size = pstyle->point.size;
+	gg->style.point.color = pstyle->point.color;
+	gg->style.line.type = pstyle->line.type;
+	gg->style.line.size = pstyle->line.size;
+	gg->style.line.color = pstyle->line.color;
+	gg->style.xaxis.type = pstyle->xaxis.type;
+	gg->style.xaxis.size = pstyle->xaxis.size;
+	gg->style.xaxis.color = pstyle->xaxis.color;
+	gg->style.yaxis.type = pstyle->yaxis.type;
+	gg->style.yaxis.size = pstyle->yaxis.size;
+	gg->style.yaxis.color = pstyle->yaxis.color;
+	gg->style.xgrid.type = pstyle->xgrid.type;
+	gg->style.xgrid.size = pstyle->xgrid.size;
+	gg->style.xgrid.color = pstyle->xgrid.color;
+	gg->style.xgrid.spacing = pstyle->xgrid.spacing;
+	gg->style.ygrid.type = pstyle->ygrid.type;
+	gg->style.ygrid.size = pstyle->ygrid.size;
+	gg->style.ygrid.color = pstyle->ygrid.color;
+	gg->style.ygrid.spacing = pstyle->ygrid.spacing;
+	gg->style.flags = pstyle->flags;
+
+	#undef gg
+}
+
+void gwinGraphSetOrigin(GHandle gh, coord_t x, coord_t y) {
+	#define gg	((GGraphObject *)gh)
+
+	if (gh->type != GW_GRAPH)
+		return;
+
+	gg->xorigin = x;
+	gg->yorigin = y;
+
+	#undef gg
+}
+
+void gwinGraphDrawAxis(GHandle gh) {
+	#define gg	((GGraphObject *)gh)
+	coord_t		i, xmin, ymin, xmax, ymax;
+
+	if (gh->type != GW_GRAPH)
+		return;
+
+	xmin = -gg->xorigin;
+	xmax = gh->width-gg->xorigin-1;
+	ymin = -gg->yorigin;
+	ymax = gh->height-gg->yorigin-1;
+
+	// x grid - this code assumes that the GGraphGridStyle is a superset of GGraphListStyle
+	if (gg->style.xgrid.type != GGRAPH_LINE_NONE && gg->style.xgrid.spacing >= 2) {
+		for(i = gg->style.xgrid.spacing; i <= xmax; i += gg->style.xgrid.spacing)
+			lineto(gg, i, ymin, i, ymax, (GGraphLineStyle *)&gg->style.xgrid);
+		for(i = -gg->style.xgrid.spacing; i >= xmin; i -= gg->style.xgrid.spacing)
+			lineto(gg, i, ymin, i, ymax, (GGraphLineStyle *)&gg->style.xgrid);
+	}
+
+	// y grid - this code assumes that the GGraphGridStyle is a superset of GGraphListStyle
+	if (gg->style.ygrid.type != GGRAPH_LINE_NONE && gg->style.ygrid.spacing >= 2) {
+		for(i = gg->style.ygrid.spacing; i <= ymax; i += gg->style.ygrid.spacing)
+			lineto(gg, xmin, i, xmax, i, (GGraphLineStyle *)&gg->style.ygrid);
+		for(i = -gg->style.ygrid.spacing; i >= ymin; i -= gg->style.ygrid.spacing)
+			lineto(gg, xmin, i, xmax, i, (GGraphLineStyle *)&gg->style.ygrid);
+	}
+
+	// x axis
+	lineto(gg, xmin, 0, xmax, 0, &gg->style.xaxis);
+	if ((gg->style.flags & GWIN_GRAPH_STYLE_XAXIS_NEGATIVE_ARROWS)) {
+		if (xmin > 0 || xmin < -(GGRAPH_ARROW_SIZE+1)) {
+			lineto(gg, xmin, 0, xmin+GGRAPH_ARROW_SIZE, GGRAPH_ARROW_SIZE, &gg->style.xaxis);
+			lineto(gg, xmin, 0, xmin+GGRAPH_ARROW_SIZE, -GGRAPH_ARROW_SIZE, &gg->style.xaxis);
+		}
+	}
+	if ((gg->style.flags & GWIN_GRAPH_STYLE_XAXIS_POSITIVE_ARROWS)) {
+		if (xmax < 0 || xmax > (GGRAPH_ARROW_SIZE+1)) {
+			lineto(gg, xmax, 0, xmax-GGRAPH_ARROW_SIZE, GGRAPH_ARROW_SIZE, &gg->style.xaxis);
+			lineto(gg, xmax, 0, xmax-GGRAPH_ARROW_SIZE, -GGRAPH_ARROW_SIZE, &gg->style.xaxis);
+		}
+	}
+
+	// y axis
+	lineto(gg, 0, ymin, 0, ymax, &gg->style.yaxis);
+	if ((gg->style.flags & GWIN_GRAPH_STYLE_YAXIS_NEGATIVE_ARROWS)) {
+		if (ymin > 0 || ymin < -(GGRAPH_ARROW_SIZE+1)) {
+			lineto(gg, 0, ymin, GGRAPH_ARROW_SIZE, ymin+GGRAPH_ARROW_SIZE, &gg->style.yaxis);
+			lineto(gg, 0, ymin, -GGRAPH_ARROW_SIZE, ymin+GGRAPH_ARROW_SIZE, &gg->style.yaxis);
+		}
+	}
+	if ((gg->style.flags & GWIN_GRAPH_STYLE_YAXIS_POSITIVE_ARROWS)) {
+		if (ymax < 0 || ymax > (GGRAPH_ARROW_SIZE+1)) {
+			lineto(gg, 0, ymax, GGRAPH_ARROW_SIZE, ymax-GGRAPH_ARROW_SIZE, &gg->style.yaxis);
+			lineto(gg, 0, ymax, -GGRAPH_ARROW_SIZE, ymax-GGRAPH_ARROW_SIZE, &gg->style.yaxis);
+		}
+	}
+
+	#undef gg
+}
+
+void gwinGraphStartSet(GHandle gh) {
+	if (gh->type != GW_GRAPH)
+		return;
+
+	gh->flags &= ~GGRAPH_FLG_CONNECTPOINTS;
+}
+
+void gwinGraphDrawPoint(GHandle gh, coord_t x, coord_t y) {
+	#define gg	((GGraphObject *)gh)
+
+	if (gh->type != GW_GRAPH)
+		return;
+
+	if ((gh->flags & GGRAPH_FLG_CONNECTPOINTS)) {
+		// Draw the line
+		lineto(gg, gg->lastx, gg->lasty, x, y, &gg->style.line);
+
+		// Redraw the previous point because the line may have overwritten it
+		pointto(gg, gg->lastx, gg->lasty, &gg->style.point);
+
+	} else
+		gh->flags |= GGRAPH_FLG_CONNECTPOINTS;
+
+	// Save this point for next time.
+	gg->lastx = x;
+	gg->lasty = y;
+
+	// Draw this point.
+	pointto(gg, x, y, &gg->style.point);
+
+	#undef gg
+}
+
+void gwinGraphDrawPoints(GHandle gh, const point *points, unsigned count) {
+	#define gg	((GGraphObject *)gh)
+	unsigned		i;
+	const point		*p;
+
+	if (gh->type != GW_GRAPH)
+		return;
+
+	// Draw the connecting lines
+	for(p = points, i = 0; i < count; p++, i++) {
+		if ((gh->flags & GGRAPH_FLG_CONNECTPOINTS)) {
+			// Draw the line
+			lineto(gg, gg->lastx, gg->lasty, p->x, p->y, &gg->style.line);
+
+			// Redraw the previous point because the line may have overwritten it
+			if (i == 0)
+				pointto(gg, gg->lastx, gg->lasty, &gg->style.point);
+
+		} else
+			gh->flags |= GGRAPH_FLG_CONNECTPOINTS;
+
+		// Save this point for next time.
+		gg->lastx = p->x;
+		gg->lasty = p->y;
+	}
+
+
+	// Draw the points.
+	for(p = points, i = 0; i < count; p++, i++)
+		pointto(gg, p->x, p->y, &gg->style.point);
+
+	#undef gg
+}
+
+#endif /* GFX_USE_GWIN && GWIN_NEED_GRAPH */
+/** @} */
+