e2fba10b95
It supports unlimited width, color gradient, texture and some geometry options for joints and caps. Also transparency without artifacts (provided that line joints aren't too sharp).
77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
#ifndef LINE_BUILDER_H
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#define LINE_BUILDER_H
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#include "math_2d.h"
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#include "color.h"
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#include "scene/resources/color_ramp.h"
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enum LineJointMode {
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LINE_JOINT_SHARP = 0,
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LINE_JOINT_BEVEL,
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LINE_JOINT_ROUND
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};
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enum LineCapMode {
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LINE_CAP_NONE = 0,
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LINE_CAP_BOX,
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LINE_CAP_ROUND
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};
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enum LineTextureMode {
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LINE_TEXTURE_NONE = 0,
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LINE_TEXTURE_TILE
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// TODO STRETCH mode
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};
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class LineBuilder {
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public:
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// TODO Move in a struct and reference it
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// Input
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Vector<Vector2> points;
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LineJointMode joint_mode;
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LineCapMode begin_cap_mode;
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LineCapMode end_cap_mode;
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float width;
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Color default_color;
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ColorRamp* gradient;
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LineTextureMode texture_mode;
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float sharp_limit;
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int round_precision;
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// TODO offset_joints option (offers alternative implementation of round joints)
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// TODO Move in a struct and reference it
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// Output
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Vector<Vector2> vertices;
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Vector<Color> colors;
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Vector<Vector2> uvs;
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Vector<int> indices;
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LineBuilder();
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void build();
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void clear_output();
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private:
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enum Orientation {
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UP = 0,
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DOWN = 1
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};
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// Triangle-strip methods
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void strip_begin(Vector2 up, Vector2 down, Color color, float uvx);
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void strip_new_quad(Vector2 up, Vector2 down, Color color, float uvx);
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void strip_add_quad(Vector2 up, Vector2 down, Color color, float uvx);
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void strip_add_tri(Vector2 up, Orientation orientation);
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void strip_add_arc(Vector2 center, float angle_delta, Orientation orientation);
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void new_arc(Vector2 center, Vector2 vbegin, float angle_delta, Color color, Rect2 uv_rect);
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private:
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bool _interpolate_color;
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int _last_index[2]; // Index of last up and down vertices of the strip
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};
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#endif // LINE_BUILDER_H
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