Cairo-Chart/src/Marker.vala

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namespace CairoChart {
public class Marker {
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public enum Type {
NONE = 0, // default
SQUARE,
CIRCLE,
TRIANGLE,
PRICLE_SQUARE,
PRICLE_CIRCLE,
PRICLE_TRIANGLE
}
public Type type = Type.NONE;
public double size = 8.0;
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public Marker (Type type = Type.NONE,
double size = 8.0
) {
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this.type = type;
this.size = size;
}
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public virtual Marker copy () {
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return new Marker (type, size);
}
public virtual void draw_at_pos (Chart chart, double x, double y) {
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chart.ctx.move_to (x, y);
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switch (type) {
case Type.SQUARE:
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chart.ctx.rectangle (x - size / 2, y - size / 2, size, size);
chart.ctx.fill();
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break;
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case Type.CIRCLE:
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chart.ctx.arc (x, y, size / 2, 0, 2 * GLib.Math.PI);
chart.ctx.fill();
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break;
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case Type.TRIANGLE:
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chart.ctx.move_to (x - size / 2, y - size / 2);
chart.ctx.line_to (x + size / 2, y - size / 2);
chart.ctx.line_to (x, y + size / 2);
chart.ctx.line_to (x - size / 2, y - size / 2);
chart.ctx.fill();
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break;
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case Type.PRICLE_SQUARE:
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chart.ctx.rectangle (x - size / 2, y - size / 2,
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size, size);
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chart.ctx.stroke();
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break;
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case Type.PRICLE_CIRCLE:
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chart.ctx.arc (x, y, size / 2, 0, 2 * GLib.Math.PI);
chart.ctx.stroke();
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break;
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case Type.PRICLE_TRIANGLE:
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chart.ctx.move_to (x - size / 2, y - size / 2);
chart.ctx.line_to (x + size / 2, y - size / 2);
chart.ctx.line_to (x, y + size / 2);
chart.ctx.line_to (x - size / 2, y - size / 2);
chart.ctx.stroke();
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break;
}
}
}
}