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Cairo-Chart
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CursorCrossings[] added.

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Kolan Sh 2017-12-01 16:25:07 +03:00
parent 22761fa04f
commit dc18d83414
1 changed files with 110 additions and 74 deletions
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184
src/Chart.vala
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@ -55,6 +55,8 @@ namespace Gtk.CairoChart {
set_vertical_axes_titles (); set_vertical_axes_titles ();
get_cursors_crossings();
calc_plot_area (); // Calculate plot area calc_plot_area (); // Calculate plot area
draw_horizontal_axis (); draw_horizontal_axis ();
@ -1276,78 +1278,31 @@ namespace Gtk.CairoChart {
public LineStyle cursor_line_style = LineStyle(Color(0.2, 0.2, 0.2, 0.8)); public LineStyle cursor_line_style = LineStyle(Color(0.2, 0.2, 0.2, 0.8));
protected virtual bool get_cursor_limits (Series s, Point cursor, out Point low, out Point high) { protected struct CursorCross {
bool ret = false; uint series_index;
low.x = plot_area_x_max; Point point;
low.y = plot_area_y_max; }
high.x = plot_area_x_min; protected struct CursorCrossings {
high.y = plot_area_y_min; uint cursor_index;
Point[] points = {}; CursorCross[] crossings;
switch (cursors_orientation) {
case CursorOrientation.VERTICAL:
points = sort_points (s, s.sort);
break;
case CursorOrientation.HORIZONTAL:
points = sort_points (s, s.sort);
break;
}
for (var i = 0; i + 1 < points.length; ++i) {
switch (cursors_orientation) {
case CursorOrientation.VERTICAL:
Float128 y = 0.0;
if (vcross(get_scr_point(s, points[i]), get_scr_point(s, points[i+1]), rel2scr_x(cursor.x),
plot_area_y_min, plot_area_y_max, out y)) {
if (y < low.y /*&& y_in_plot_area(y)*/) low.y = y;
if (y > high.y /*&& y_in_plot_area(y)*/) high.y = y;
ret = true;
}
break;
case CursorOrientation.HORIZONTAL:
Float128 x = 0.0;
if (hcross(get_scr_point(s, points[i]), get_scr_point(s, points[i+1]),
plot_area_x_min, plot_area_x_max, rel2scr_y(cursor.y), out x)) {
if (x < low.x /*&& x_in_plot_area(x)*/) low.x = x;
if (x > high.x /*&& x_in_plot_area(x)*/) high.x = x;
ret = true;
}
break;
}
}
if (common_x_axes) {
switch (s.axis_x.position) {
case Axis.Position.LOW: high.y = plot_area_y_max + s.axis_x.font_indent; break;
case Axis.Position.HIGH: low.y = plot_area_y_min - s.axis_x.font_indent; break;
case Axis.Position.BOTH:
high.y = plot_area_y_max + s.axis_x.font_indent;
low.y = plot_area_y_min - s.axis_x.font_indent;
break;
}
ret = true;
}
if (common_y_axes) {
switch (s.axis_y.position) {
case Axis.Position.LOW: low.x = plot_area_x_min - s.axis_y.font_indent; break;
case Axis.Position.HIGH: high.x = plot_area_x_max + s.axis_y.font_indent; break;
case Axis.Position.BOTH:
low.x = plot_area_x_min - s.axis_y.font_indent;
high.x = plot_area_x_max + s.axis_y.font_indent;
break;
}
ret = true;
}
return ret;
} }
protected virtual void draw_cursors () { protected CursorCrossings[] cursors_crossings = {};
if (series.length == 0) return;
protected List<Point?> get_all_cursors () {
var all_cursors = cursors.copy_deep ((src) => { return src; }); var all_cursors = cursors.copy_deep ((src) => { return src; });
if (is_cursor_active) if (is_cursor_active)
all_cursors.append(active_cursor); all_cursors.append(active_cursor);
return all_cursors;
}
foreach (var c in all_cursors) { protected void get_cursors_crossings () {
var all_cursors = get_all_cursors();
CursorCrossings[] local_cursor_crossings = {};
for (var ci = 0, max_ci = all_cursors.length(); ci < max_ci; ++ci) {
var c = all_cursors.nth_data(ci);
switch (cursors_orientation) { switch (cursors_orientation) {
case CursorOrientation.VERTICAL: case CursorOrientation.VERTICAL:
if (c.x <= _rel_zoom_x_min || c.x >= _rel_zoom_x_max) continue; break; if (c.x <= _rel_zoom_x_min || c.x >= _rel_zoom_x_max) continue; break;
@ -1355,23 +1310,103 @@ namespace Gtk.CairoChart {
if (c.y <= _rel_zoom_y_min || c.y >= _rel_zoom_y_max) continue; break; if (c.y <= _rel_zoom_y_min || c.y >= _rel_zoom_y_max) continue; break;
} }
var low = Point(plot_area_x_max, plot_area_y_max); // low and high CursorCross[] crossings = {};
var high = Point(plot_area_x_min, plot_area_y_min); // points of the cursor for (var si = 0, max_si = series.length; si < max_si; ++si) {
foreach (var s in series) { var s = series[si];
if (!s.zoom_show) continue; if (!s.zoom_show) continue;
var l = Point(), h = Point();
if (get_cursor_limits (s, c, out l, out h)) { Point[] points = {};
if (l.x < low.x) low.x = l.x; switch (cursors_orientation) {
if (l.y < low.y) low.y = l.y; case CursorOrientation.VERTICAL:
if (h.x > high.x) high.x = h.x; points = sort_points (s, s.sort);
if (h.y > high.y) high.y = h.y; break;
case CursorOrientation.HORIZONTAL:
points = sort_points (s, s.sort);
break;
}
for (var i = 0; i + 1 < points.length; ++i) {
switch (cursors_orientation) {
case CursorOrientation.VERTICAL:
Float128 y = 0.0;
if (vcross(get_scr_point(s, points[i]), get_scr_point(s, points[i+1]), rel2scr_x(c.x),
plot_area_y_min, plot_area_y_max, out y)) {
CursorCross cc = {si, Point(get_real_x(s, rel2scr_x(c.x)), get_real_y(s, y))};
crossings += cc;
//stdout.printf("si = %d, rel2scr_x(c.x) = %f, y = %f\n", si, rel2scr_x(c.x), y);
}
break;
case CursorOrientation.HORIZONTAL:
Float128 x = 0.0;
if (hcross(get_scr_point(s, points[i]), get_scr_point(s, points[i+1]),
plot_area_x_min, plot_area_x_max, rel2scr_y(c.y), out x)) {
CursorCross cc = {si, Point(get_real_x(s, x), get_real_y(s, rel2scr_y(c.y)))};
crossings += cc;
}
break;
}
} }
} }
if (crossings.length != 0) {
CursorCrossings ccs = {ci, crossings};
local_cursor_crossings += ccs;
}
}
cursors_crossings = local_cursor_crossings;
//if (cursors_crossings.length != 0)
//stdout.printf("cursors_crossings[0].crossings.length = %d\n", cursors_crossings[0].crossings.length);
}
protected virtual void draw_cursors () {
if (series.length == 0) return;
var all_cursors = get_all_cursors();
for (var cci = 0, max_cci = cursors_crossings.length; cci < max_cci; ++cci) {
var low = Point(plot_area_x_max, plot_area_y_max); // low and high
var high = Point(plot_area_x_min, plot_area_y_min); // points of the cursor
var ccs = cursors_crossings[cci].crossings;
for (var ci = 0, max_ci = ccs.length; ci < max_ci; ++ci) {
var si = ccs[ci].series_index;
var s = series[si];
var p = ccs[ci].point;
var scrx = get_scr_x(s, p.x);
var scry = get_scr_y(s, p.y);
if (scrx < low.x) low.x = scrx;
//stdout.printf("low.y = %f, high.y = %f\n", low.y, high.y);
if (scry < low.y) low.y = scry;
if (scrx > high.x) high.x = scrx;
if (scry > high.y) high.y = scry;
if (common_x_axes) {
switch (s.axis_x.position) {
case Axis.Position.LOW: high.y = plot_area_y_max + s.axis_x.font_indent; break;
case Axis.Position.HIGH: low.y = plot_area_y_min - s.axis_x.font_indent; break;
case Axis.Position.BOTH:
high.y = plot_area_y_max + s.axis_x.font_indent;
low.y = plot_area_y_min - s.axis_x.font_indent;
break;
}
}
if (common_y_axes) {
switch (s.axis_y.position) {
case Axis.Position.LOW: low.x = plot_area_x_min - s.axis_y.font_indent; break;
case Axis.Position.HIGH: high.x = plot_area_x_max + s.axis_y.font_indent; break;
case Axis.Position.BOTH:
low.x = plot_area_x_min - s.axis_y.font_indent;
high.x = plot_area_x_max + s.axis_y.font_indent;
break;
}
}
}
var c = all_cursors.nth_data(cursors_crossings[cci].cursor_index);
switch (cursors_orientation) { switch (cursors_orientation) {
case CursorOrientation.VERTICAL: case CursorOrientation.VERTICAL:
if (low.y > high.y) continue; if (low.y > high.y) continue;
set_line_style(cursor_line_style); set_line_style(cursor_line_style);
//stdout.printf("rel2scr_x(c.x) = %f, low.y = %f\n", rel2scr_x(c.x), low.y);
context.move_to (rel2scr_x(c.x), low.y); context.move_to (rel2scr_x(c.x), low.y);
context.line_to (rel2scr_x(c.x), high.y); context.line_to (rel2scr_x(c.x), high.y);
context.stroke(); context.stroke();
@ -1419,6 +1454,7 @@ namespace Gtk.CairoChart {
chart.cursor_line_style = this.cursor_line_style; chart.cursor_line_style = this.cursor_line_style;
chart.cursor_max_rm_distance = this.cursor_max_rm_distance; chart.cursor_max_rm_distance = this.cursor_max_rm_distance;
chart.cursors = this.cursors.copy(); chart.cursors = this.cursors.copy();
chart.cursors_crossings = this.cursors_crossings.copy(); // no deep copying for .crossings
chart.cursors_orientation = this.cursors_orientation; chart.cursors_orientation = this.cursors_orientation;
chart.height = this.height; chart.height = this.height;
chart.is_cursor_active = this.is_cursor_active; chart.is_cursor_active = this.is_cursor_active;