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Cairo-Chart
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This commit is contained in:
Kolan Sh 2018-01-18 18:10:28 +03:00
parent 29b4cac4f9
commit 3dd7e4ce88
3 changed files with 61 additions and 59 deletions
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20
src/Chart.vala
View File

@ -86,7 +86,7 @@ namespace CairoChart {
/**
* ``Chart`` cursors.
*/
public Cursors cursors { get; protected set; default = new Cursors (); }
public Cursors cursors { get; protected set; default = null; }
/**
* Math functions.
@ -111,7 +111,9 @@ namespace CairoChart {
/**
* Constructs a new ``Chart``.
*/
public Chart () { }
public Chart () {
cursors = new Cursors (this);
}
/**
* Gets a copy of the ``Chart``.
@ -156,7 +158,7 @@ namespace CairoChart {
set_vertical_axes_titles ();
cursors.get_cursors_crossings(this);
cursors.get_cursors_crossings();
calc_plot_area ();
@ -172,7 +174,7 @@ namespace CairoChart {
draw_series ();
fix_evarea ();
cursors.draw_cursors (this);
cursors.draw_cursors ();
fix_evarea ();
return true;
@ -350,15 +352,5 @@ namespace CairoChart {
s.draw();
}
}
public virtual Float128 rel2scr_x(Float128 x) {
return plarea.x + plarea.width * (x - zoom.x) / zoom.width;
}
public virtual Float128 rel2scr_y(Float128 y) {
return plarea.y + plarea.height * (y - zoom.y) / zoom.height;
}
public virtual Point128 rel2scr_point (Point128 p) {
return Point128 (rel2scr_x(p.x), rel2scr_y(p.y));
}
}
}

88
src/Cursor.vala
View File

@ -7,12 +7,14 @@ namespace CairoChart {
public bool is_cursor_active = false; // { get; protected set; default = false; }
public Cursors.Style cursor_style = Cursors.Style();
public Cursors.CursorCrossings[] cursors_crossings = {};
protected Chart chart = null;
public Cursors () {
public Cursors (Chart chart) {
this.chart = chart;
}
public Cursors copy () {
var c = new Cursors ();
var c = new Cursors (chart);
c.list = list.copy();
c.active_cursor = active_cursor;
c.is_cursor_active = is_cursor_active;
@ -55,7 +57,7 @@ namespace CairoChart {
CursorCross[] crossings;
}
public virtual void set_active_cursor (Chart chart, Point p, bool remove = false) {
public virtual void set_active_cursor (Point p, bool remove = false) {
active_cursor.x = chart.zoom.x + (p.x - chart.plarea.x) / chart.plarea.width * chart.zoom.width;
active_cursor.y = chart.zoom.y + chart.zoom.height - (chart.plarea.y + chart.plarea.height - p.y) / chart.plarea.height * chart.zoom.height;
is_cursor_active = ! remove;
@ -66,7 +68,15 @@ namespace CairoChart {
is_cursor_active = false;
}
public virtual void remove_active_cursor (Chart chart) {
public virtual Float128 rel2scr_x(Float128 x) {
return chart.plarea.x + chart.plarea.width * (x - chart.zoom.x) / chart.zoom.width;
}
public virtual Float128 rel2scr_y(Float128 y) {
return chart.plarea.y + chart.plarea.height * (y - chart.zoom.y) / chart.zoom.height;
}
public virtual void remove_active_cursor () {
if (list.length() == 0) return;
var distance = 1024.0 * 1024.0;//width * width;
uint rm_indx = 0;
@ -75,10 +85,10 @@ namespace CairoChart {
double d = distance;
switch (cursor_style.orientation) {
case Cursors.Orientation.VERTICAL:
d = (chart.rel2scr_x(c.x) - chart.rel2scr_x(active_cursor.x)).abs();
d = (rel2scr_x(c.x) - rel2scr_x(active_cursor.x)).abs();
break;
case Cursors.Orientation.HORIZONTAL:
d = (chart.rel2scr_y(c.y) - chart.rel2scr_y(active_cursor.y)).abs();
d = (rel2scr_y(c.y) - rel2scr_y(active_cursor.y)).abs();
break;
}
if (d < distance) {
@ -92,15 +102,15 @@ namespace CairoChart {
is_cursor_active = false;
}
protected List<Point?> get_all_cursors (Chart chart) {
protected List<Point?> get_all_cursors () {
var all_cursors = list.copy_deep ((src) => { return src; });
if (is_cursor_active)
all_cursors.append(active_cursor);
return all_cursors;
}
public void get_cursors_crossings (Chart chart) {
var all_cursors = get_all_cursors(chart);
public void get_cursors_crossings () {
var all_cursors = get_all_cursors();
CursorCrossings[] local_cursor_crossings = {};
@ -132,12 +142,12 @@ namespace CairoChart {
switch (cursor_style.orientation) {
case Orientation.VERTICAL:
Float128 y = 0.0;
if (chart.math.vcross(s.get_scr_point(points[i]), s.get_scr_point(points[i+1]), chart.rel2scr_x(c.x),
if (chart.math.vcross(s.get_scr_point(points[i]), s.get_scr_point(points[i+1]), rel2scr_x(c.x),
chart.plarea.y, chart.plarea.y + chart.plarea.height, out y)) {
var point = Point128(s.get_real_x(chart.rel2scr_x(c.x)), s.get_real_y(y));
var point = Point128(s.get_real_x(rel2scr_x(c.x)), s.get_real_y(y));
Point128 size; bool show_x, show_date, show_time, show_y;
cross_what_to_show(chart, s, out show_x, out show_time, out show_date, out show_y);
calc_cross_sizes (chart, s, point, out size, show_x, show_time, show_date, show_y);
cross_what_to_show(s, out show_x, out show_time, out show_date, out show_y);
calc_cross_sizes (s, point, out size, show_x, show_time, show_date, show_y);
CursorCross cc = {si, point, size, show_x, show_date, show_time, show_y};
crossings += cc;
}
@ -145,11 +155,11 @@ namespace CairoChart {
case Orientation.HORIZONTAL:
Float128 x = 0.0;
if (chart.math.hcross(s.get_scr_point(points[i]), s.get_scr_point(points[i+1]),
chart.plarea.x, chart.plarea.x + chart.plarea.width, chart.rel2scr_y(c.y), out x)) {
var point = Point128(s.get_real_x(x), s.get_real_y(chart.rel2scr_y(c.y)));
chart.plarea.x, chart.plarea.x + chart.plarea.width, rel2scr_y(c.y), out x)) {
var point = Point128(s.get_real_x(x), s.get_real_y(rel2scr_y(c.y)));
Point128 size; bool show_x, show_date, show_time, show_y;
cross_what_to_show(chart, s, out show_x, out show_time, out show_date, out show_y);
calc_cross_sizes (chart, s, point, out size, show_x, show_time, show_date, show_y);
cross_what_to_show(s, out show_x, out show_time, out show_date, out show_y);
calc_cross_sizes (s, point, out size, show_x, show_time, show_date, show_y);
CursorCross cc = {si, point, size, show_x, show_date, show_time, show_y};
crossings += cc;
}
@ -165,7 +175,7 @@ namespace CairoChart {
cursors_crossings = local_cursor_crossings;
}
protected virtual void calc_cursors_value_positions (Chart chart) {
protected virtual void calc_cursors_value_positions () {
for (var ccsi = 0, max_ccsi = cursors_crossings.length; ccsi < max_ccsi; ++ccsi) {
for (var cci = 0, max_cci = cursors_crossings[ccsi].crossings.length; cci < max_cci; ++cci) {
// TODO: Ticket #142: find smart algorithm of cursors values placements
@ -177,7 +187,7 @@ namespace CairoChart {
}
}
protected virtual void cross_what_to_show (Chart chart, Series s, out bool show_x, out bool show_time,
protected virtual void cross_what_to_show (Series s, out bool show_x, out bool show_time,
out bool show_date, out bool show_y) {
show_x = show_time = show_date = show_y = false;
switch (cursor_style.orientation) {
@ -205,11 +215,11 @@ namespace CairoChart {
}
}
protected virtual void calc_cross_sizes (Chart chart, Series s, Point128 p, out Point128 size,
protected virtual void calc_cross_sizes (Series s, Point128 p, out Point128 size,
bool show_x = false, bool show_time = false,
bool show_date = false, bool show_y = false) {
if (show_x == show_time == show_date == show_y == false)
cross_what_to_show(chart, s, out show_x, out show_time, out show_date, out show_y);
cross_what_to_show(s, out show_x, out show_time, out show_date, out show_y);
size = Point128 ();
string date, time;
s.axis_x.format_date_time(p.x, out date, out time);
@ -227,11 +237,11 @@ namespace CairoChart {
size.y = double.max (h_x, h_y);
}
public virtual void draw_cursors (Chart chart) {
public virtual void draw_cursors () {
if (chart.series.length == 0) return;
var all_cursors = get_all_cursors(chart);
calc_cursors_value_positions(chart);
var all_cursors = get_all_cursors();
calc_cursors_value_positions();
for (var cci = 0, max_cci = cursors_crossings.length; cci < max_cci; ++cci) {
var low = Point128(chart.plarea.x + chart.plarea.width, chart.plarea.y + chart.plarea.height); // low and high
@ -279,13 +289,13 @@ namespace CairoChart {
switch (cursor_style.orientation) {
case Orientation.VERTICAL:
if (low.y > high.y) continue;
chart.ctx.move_to (chart.rel2scr_x(c.x), low.y);
chart.ctx.line_to (chart.rel2scr_x(c.x), high.y);
chart.ctx.move_to (rel2scr_x(c.x), low.y);
chart.ctx.line_to (rel2scr_x(c.x), high.y);
// show joint X value
if (chart.joint_x) {
var s = chart.series[chart.zoom_1st_idx];
var x = s.get_real_x(chart.rel2scr_x(c.x));
var x = s.get_real_x(rel2scr_x(c.x));
string text = "", time_text = "";
switch (s.axis_x.type) {
case Axis.Type.NUMBERS:
@ -340,13 +350,13 @@ namespace CairoChart {
break;
case Orientation.HORIZONTAL:
if (low.x > high.x) continue;
chart.ctx.move_to (low.x, chart.rel2scr_y(c.y));
chart.ctx.line_to (high.x, chart.rel2scr_y(c.y));
chart.ctx.move_to (low.x, rel2scr_y(c.y));
chart.ctx.line_to (high.x, rel2scr_y(c.y));
// show joint Y value
if (chart.joint_y) {
var s = chart.series[chart.zoom_1st_idx];
var y = s.get_real_y(chart.rel2scr_y(c.y));
var y = s.get_real_y(rel2scr_y(c.y));
var text_t = new Text(s.axis_y.format.printf((LongDouble)y, s.axis_y.font_style));
var print_y = s.compact_rec_y_pos (y, text_t);
var print_x = 0.0;
@ -429,17 +439,17 @@ namespace CairoChart {
}
}
public bool get_cursors_delta (Chart chart, out Float128 delta) {
public bool get_cursors_delta (out Float128 delta) {
delta = 0.0;
if (chart.series.length == 0) return false;
if (list.length() + (is_cursor_active ? 1 : 0) != 2) return false;
if (chart.joint_x && cursor_style.orientation == Orientation.VERTICAL) {
Float128 val1 = chart.series[chart.zoom_1st_idx].get_real_x(chart.rel2scr_x(list.nth_data(0).x));
Float128 val1 = chart.series[chart.zoom_1st_idx].get_real_x(rel2scr_x(list.nth_data(0).x));
Float128 val2 = 0;
if (is_cursor_active)
val2 = chart.series[chart.zoom_1st_idx].get_real_x(chart.rel2scr_x(active_cursor.x));
val2 = chart.series[chart.zoom_1st_idx].get_real_x(rel2scr_x(active_cursor.x));
else
val2 = chart.series[chart.zoom_1st_idx].get_real_x(chart.rel2scr_x(list.nth_data(1).x));
val2 = chart.series[chart.zoom_1st_idx].get_real_x(rel2scr_x(list.nth_data(1).x));
if (val2 > val1)
delta = val2 - val1;
else
@ -447,12 +457,12 @@ namespace CairoChart {
return true;
}
if (chart.joint_y && cursor_style.orientation == Orientation.HORIZONTAL) {
Float128 val1 = chart.series[chart.zoom_1st_idx].get_real_y(chart.rel2scr_y(list.nth_data(0).y));
Float128 val1 = chart.series[chart.zoom_1st_idx].get_real_y(rel2scr_y(list.nth_data(0).y));
Float128 val2 = 0;
if (is_cursor_active)
val2 = chart.series[chart.zoom_1st_idx].get_real_y(chart.rel2scr_y(active_cursor.y));
val2 = chart.series[chart.zoom_1st_idx].get_real_y(rel2scr_y(active_cursor.y));
else
val2 = chart.series[chart.zoom_1st_idx].get_real_y(chart.rel2scr_y(list.nth_data(1).y));
val2 = chart.series[chart.zoom_1st_idx].get_real_y(rel2scr_y(list.nth_data(1).y));
if (val2 > val1)
delta = val2 - val1;
else
@ -462,9 +472,9 @@ namespace CairoChart {
return false;
}
public string get_cursors_delta_str (Chart chart) {
public string get_cursors_delta_str () {
Float128 delta = 0.0;
if (!get_cursors_delta(chart, out delta)) return "";
if (!get_cursors_delta(out delta)) return "";
var str = "";
var s = chart.series[chart.zoom_1st_idx];
if (chart.joint_x)

10
test/ChartTest.vala
View File

@ -429,7 +429,7 @@ int main (string[] args) {
chart.draw_selection (Cairo.Rectangle() {x = sel_x0, y = sel_y0, width = sel_x1 - sel_x0, height = sel_y1 - sel_y0});
// show delta
var str = chart.cursors.get_cursors_delta_str(chart);
var str = chart.cursors.get_cursors_delta_str();
if (str != "") {
var text = "Δ = " + str;
var text_t = new Text(text);
@ -454,11 +454,11 @@ int main (string[] args) {
switch (event.button) {
case 1: // start cursor position selection
if ((event.state & Gdk.ModifierType.SHIFT_MASK) != 0) { // remove cursor
chart.cursors.set_active_cursor (chart, Point(event.x, event.y), true);
chart.cursors.remove_active_cursor(chart);
chart.cursors.set_active_cursor (Point(event.x, event.y), true);
chart.cursors.remove_active_cursor();
mouse_state = MouseState.FREE;
} else { // add cursor
chart.cursors.set_active_cursor (chart, Point(event.x, event.y));
chart.cursors.set_active_cursor (Point(event.x, event.y));
mouse_state = MouseState.CURSOR_SELECTION;
}
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
@ -532,7 +532,7 @@ int main (string[] args) {
break;
case MouseState.CURSOR_SELECTION:
chart.cursors.set_active_cursor (chart, Point(event.x, event.y));
chart.cursors.set_active_cursor (Point(event.x, event.y));
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
break;
}