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Cairo-Chart
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draw_series() -> Series.vala

This commit is contained in:
Kolan Sh 2018-01-15 12:32:47 +03:00
parent a73d81fc89
commit 73b0ebdcb0
2 changed files with 33 additions and 27 deletions
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34
src/Chart.vala
View File

@ -382,7 +382,7 @@ namespace CairoChart {
+ sz.height * (y - (s.axis_y.zoom_min + s.axis_y.zoom_max) / 2.0) / (s.axis_y.zoom_max - s.axis_y.zoom_min);
}
protected CairoChart.Math math = new Math();
public CairoChart.Math math = new Math();
protected virtual void draw_horizontal_axis () {
for (var si = series.length - 1, nskip = 0; si >=0; --si) {
@ -697,17 +697,17 @@ namespace CairoChart {
context.stroke ();
}
protected virtual double get_scr_x (Series s, Float128 x) {
public virtual double get_scr_x (Series s, Float128 x) {
return plot_x_min + (plot_x_max - plot_x_min) * (s.place.zoom_x_min + (x - s.axis_x.zoom_min)
/ (s.axis_x.zoom_max - s.axis_x.zoom_min) * (s.place.zoom_x_max - s.place.zoom_x_min));
}
protected virtual double get_scr_y (Series s, Float128 y) {
public virtual double get_scr_y (Series s, Float128 y) {
return plot_y_max - (plot_y_max - plot_y_min) * (s.place.zoom_y_min + (y - s.axis_y.zoom_min)
/ (s.axis_y.zoom_max - s.axis_y.zoom_min) * (s.place.zoom_y_max - s.place.zoom_y_min));
}
protected virtual Point get_scr_point (Series s, Point p) {
public virtual Point get_scr_point (Series s, Point p) {
return Point (get_scr_x(s, p.x), get_scr_y(s, p.y));
}
@ -737,7 +737,7 @@ namespace CairoChart {
return false;
}
protected virtual bool point_in_plot_area (Point p) {
public virtual bool point_in_plot_area (Point p) {
if (math.point_in_rect (p, plot_x_min, plot_x_max, plot_y_min, plot_y_max))
return true;
return false;
@ -746,28 +746,8 @@ namespace CairoChart {
protected virtual void draw_series () {
for (var si = 0; si < series.length; ++si) {
var s = series[si];
if (!s.zoom_show) continue;
if (s.points.length == 0) continue;
var points = math.sort_points(s, s.sort);
s.line_style.set(this);
// draw series line
for (int i = 1; i < points.length; ++i) {
Point c, d;
if (math.cut_line (Point(plot_x_min, plot_y_min), Point(plot_x_max, plot_y_max),
Point(get_scr_x(s, points[i - 1].x), get_scr_y(s, points[i - 1].y)),
Point(get_scr_x(s, points[i].x), get_scr_y(s, points[i].y)),
out c, out d)) {
context.move_to (c.x, c.y);
context.line_to (d.x, d.y);
}
}
context.stroke();
for (int i = 0; i < points.length; ++i) {
var x = get_scr_x(s, points[i].x);
var y = get_scr_y(s, points[i].y);
if (point_in_plot_area (Point (x, y)))
s.marker.draw_at_pos(this, x, y);
}
if (s.zoom_show && s.points.length != 0)
s.draw(this);
}
}

26
src/Series.vala
View File

@ -59,5 +59,31 @@ namespace CairoChart {
public Series () {
}
public virtual void draw (Chart chart) {
var points = chart.math.sort_points(this, sort);
line_style.set(chart);
// draw series line
for (int i = 1; i < points.length; ++i) {
Point c, d;
if (chart.math.cut_line (
Point(chart.plot_x_min, chart.plot_y_min),
Point(chart.plot_x_max, chart.plot_y_max),
Point(chart.get_scr_x(this, points[i - 1].x), chart.get_scr_y(this, points[i - 1].y)),
Point(chart.get_scr_x(this, points[i].x), chart.get_scr_y(this, points[i].y)),
out c, out d)
) {
chart.context.move_to (c.x, c.y);
chart.context.line_to (d.x, d.y);
}
}
chart.context.stroke();
for (int i = 0; i < points.length; ++i) {
var x = chart.get_scr_x(this, points[i].x);
var y = chart.get_scr_y(this, points[i].y);
if (chart.point_in_plot_area (Point (x, y)))
marker.draw_at_pos(chart, x, y);
}
}
}
}