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Cairo-Chart
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Closes #140: Move feature.

This commit is contained in:
Kolan Sh 2017-10-06 22:46:51 +03:00
parent 42b846fa75
commit d4d092c376
2 changed files with 66 additions and 17 deletions
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46
src/Chart.vala
View File

@ -102,6 +102,11 @@ namespace Gtk.CairoChart {
return new_series;
}
double rel_zoom_x_min = 0.0;
double rel_zoom_x_max = 1.0;
double rel_zoom_y_min = 0.0;
double rel_zoom_y_max = 1.0;
public virtual void zoom_in (double x0, double y0, double x1, double y1) {
for (var i = 0, max_i = zoom_series.length; i < max_i; ++i) {
var s = zoom_series[i];
@ -142,6 +147,15 @@ namespace Gtk.CairoChart {
s.place.zoom_y_high = (s.axis_y.zoom_max - real_y1) / (real_y0 - real_y1);
}
}
var new_rel_zoom_x_min = rel_zoom_x_min + (x0 - plot_area_x_min) / (plot_area_x_max - plot_area_x_min) * (rel_zoom_x_max - rel_zoom_x_min);
var new_rel_zoom_x_max = rel_zoom_x_min + (x1 - plot_area_x_min) / (plot_area_x_max - plot_area_x_min) * (rel_zoom_x_max - rel_zoom_x_min);
var new_rel_zoom_y_min = rel_zoom_y_min + (y0 - plot_area_y_min) / (plot_area_y_max - plot_area_y_min) * (rel_zoom_y_max - rel_zoom_y_min);
var new_rel_zoom_y_max = rel_zoom_y_min + (y1 - plot_area_y_min) / (plot_area_y_max - plot_area_y_min) * (rel_zoom_y_max - rel_zoom_y_min);
rel_zoom_x_min = new_rel_zoom_x_min;
rel_zoom_x_max = new_rel_zoom_x_max;
rel_zoom_y_min = new_rel_zoom_y_min;
rel_zoom_y_max = new_rel_zoom_y_max;
}
public virtual void zoom_out () {
@ -160,6 +174,34 @@ namespace Gtk.CairoChart {
s.place.zoom_y_low = s.place.y_low;
s.place.zoom_y_high = s.place.y_high;
}
rel_zoom_x_min = 0;
rel_zoom_x_max = 1;
rel_zoom_y_min = 0;
rel_zoom_y_max = 1;
}
public virtual void move (double delta_x, double delta_y) {
delta_x /= plot_area_x_max - plot_area_x_min; delta_x *= - 1.0;
delta_y /= plot_area_y_max - plot_area_y_min; delta_y *= - 1.0;
var rzxmin = rel_zoom_x_min, rzxmax = rel_zoom_x_max, rzymin = rel_zoom_y_min, rzymax = rel_zoom_y_max;
zoom_out();
draw(); // TODO: optimize here
delta_x *= plot_area_x_max - plot_area_x_min;
delta_y *= plot_area_y_max - plot_area_y_min;
var xmin = plot_area_x_min + (plot_area_x_max - plot_area_x_min) * rzxmin;
var xmax = plot_area_x_min + (plot_area_x_max - plot_area_x_min) * rzxmax;
var ymin = plot_area_y_min + (plot_area_y_max - plot_area_y_min) * rzymin;
var ymax = plot_area_y_min + (plot_area_y_max - plot_area_y_min) * rzymax;
delta_x *= rzxmax - rzxmin; delta_y *= rzymax - rzymin;
if (xmin + delta_x < plot_area_x_min) delta_x = plot_area_x_min - xmin;
if (xmax + delta_x > plot_area_x_max) delta_x = plot_area_x_max - xmax;
if (ymin + delta_y < plot_area_y_min) delta_y = plot_area_y_min - ymin;
if (ymax + delta_y > plot_area_y_max) delta_y = plot_area_y_max - ymax;
zoom_in (xmin + delta_x, ymin + delta_y, xmax + delta_x, ymax + delta_y);
draw(); // TODO: optimize here
}
protected double title_width = 0.0;
@ -1142,6 +1184,10 @@ namespace Gtk.CairoChart {
chart.plot_area_x_min = this.plot_area_x_min;
chart.plot_area_y_max = this.plot_area_y_max;
chart.plot_area_y_min = this.plot_area_y_min;
chart.rel_zoom_x_min = this.rel_zoom_x_min;
chart.rel_zoom_x_max = this.rel_zoom_x_max;
chart.rel_zoom_y_min = this.rel_zoom_y_min;
chart.rel_zoom_y_max = this.rel_zoom_y_max;
chart.selection_style = this.selection_style;
chart.zoom_series = this.zoom_series.copy();
chart.show_legend = this.show_legend;

37
test/ChartTest.vala
View File

@ -336,6 +336,8 @@ int main (string[] args) {
bool draw_selection = false;
double sel_x0 = 0, sel_x1 = 0, sel_y0 = 0, sel_y1 = 0;
bool moving_chart = false;
double mov_x0 = 0, mov_y0 = 0;
da.draw.connect((context) => {
// user's pre draw operations here...
@ -362,8 +364,6 @@ int main (string[] args) {
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
da.button_press_event.connect((event) => {
// user's pre button_press_event operations here...
//stdout.puts("pre_press\n");
if (event.button == 2 && point_in_chart(chart, event.x, event.y)) {
draw_selection = true;
@ -372,14 +372,16 @@ int main (string[] args) {
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
}
// user's post button_press_event operations here...
//stdout.puts("post_press\n");
if (event.button == 3 && point_in_chart(chart, event.x, event.y)) {
moving_chart = true;
mov_x0 = event.x;
mov_y0 = event.y;
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
}
return true; // return ret;
});
da.button_release_event.connect((event) => {
// user's pre button_release_event operations here...
//stdout.puts("pre_release\n");
//var ret = chart.button_release_event(event);
if (event.button == 2) {
@ -393,37 +395,38 @@ int main (string[] args) {
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
}
// user's post button_release_event operations here...
//stdout.puts("post_release\n");
if (event.button == 3 && point_in_chart(chart, event.x, event.y)) {
moving_chart = false;
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
}
return true; // return ret;
});
da.motion_notify_event.connect((event) => {
// user's pre motion_notify_event operations here...
//stdout.puts("pre_motion\n");
//var ret = chart.motion_notify_event(event);
// user's post motion_notify_event operations here...
//stdout.puts("post_motion\n");
if (draw_selection && point_in_chart(chart, event.x, event.y)) {
sel_x1 = event.x;
sel_y1 = event.y;
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
}
if (moving_chart && point_in_chart(chart, event.x, event.y)) {
var delta_x = event.x - mov_x0, delta_y = event.y - mov_y0;
chart.move (delta_x, delta_y);
mov_x0 = event.x;
mov_y0 = event.y;
da.queue_draw_area(0, 0, da.get_allocated_width(), da.get_allocated_height());
}
return true; // return ret;
});
da.add_events(Gdk.EventMask.SCROLL_MASK);
da.scroll_event.connect((event) => {
// user's pre scroll_notify_event operations here...
//stdout.puts("pre_scroll\n");
//var ret = chart.scroll_notify_event(event);
// user's post scroll_notify_event operations here...
//stdout.puts("post_scroll\n");
return true; // return ret;
});