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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://chibios-gfx.com/license.html
*/
/**
* @file src/gwin/graph.c
* @brief GWIN sub-system button code.
*/
#include "gfx.h"
#if GFX_USE_GWIN && GWIN_NEED_GRAPH
#include "gwin/class_gwin.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 const gwinVMT graphVMT = {
"Graph", // The classname
sizeof(GGraphObject), // The object size
0, // The destroy routine
0, // The redraw routine
0, // The after-clear routine
};
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->g.x + gg->xorigin;
y = gg->g.y + gg->g.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->g.x + gg->xorigin;
y0 = gg->g.y + gg->g.height - 1 - gg->yorigin - y0;
x1 += gg->g.x + gg->xorigin;
y1 = gg->g.y + gg->g.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, GWindowInit *pInit) {
if (!(gg = (GGraphObject *)_gwindowCreate(&gg->g, pInit, &graphVMT, 0)))
return 0;
gg->xorigin = gg->yorigin = 0;
gg->lastx = gg->lasty = 0;
gwinGraphSetStyle((GHandle)gg, &GGraphDefaultStyle);
gwinSetVisible((GHandle)gg, pInit->show);
return (GHandle)gg;
}
void gwinGraphSetStyle(GHandle gh, const GGraphStyle *pstyle) {
#define gg ((GGraphObject *)gh)
if (gh->vmt != &graphVMT)
return;
gg->style.point = pstyle->point;
gg->style.line = pstyle->line;
gg->style.xaxis = pstyle->xaxis;
gg->style.yaxis = pstyle->yaxis;
gg->style.xgrid = pstyle->xgrid;
gg->style.ygrid = pstyle->ygrid;
gg->style.flags = pstyle->flags;
#undef gg
}
void gwinGraphSetOrigin(GHandle gh, coord_t x, coord_t y) {
#define gg ((GGraphObject *)gh)
if (gh->vmt != &graphVMT)
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->vmt != &graphVMT)
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->vmt != &graphVMT)
return;
gh->flags &= ~GGRAPH_FLG_CONNECTPOINTS;
}
void gwinGraphDrawPoint(GHandle gh, coord_t x, coord_t y) {
#define gg ((GGraphObject *)gh)
if (gh->vmt != &graphVMT)
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->vmt != &graphVMT)
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 */
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