94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
package gg
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import (
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//"github.com/hajimehoshi/ebiten/v2"
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//"github.com/hajimehoshi/ebiten/v2/vector"
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//"fmt"
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//"image"
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)
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// The type describes rectangle geometry with
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// way to move, rotate and scale it.
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type Rectangle struct {
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Object
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Transform
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Width, Height Float
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}
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// Return points of vertices of the rectangle.
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func (r Rectangle) Vertices() Vertices {
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t := r.Transform
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wh := V(r.Width, r.Height)
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t.Around = t.Around.Scale(wh)
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m := t.Matrix()
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p1 := V(0, 0).Apply(m)
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p2 := V(wh.X, 0).Apply(m)
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p3 := V(wh.X, wh.Y).Apply(m)
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p4 := V(0, wh.Y).Apply(m)
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return Vertices{p1, p2, p3, p4}
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}
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func (r Rectangle) Edges() Edges {
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vs := r.Vertices()
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return Edges{
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Edge{vs[0], vs[1]},
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Edge{vs[1], vs[2]},
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Edge{vs[2], vs[3]},
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Edge{vs[3], vs[0]},
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}
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}
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// Get 2 triangles that the rectangle consists of.
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func (r Rectangle) MakeTriangles() Triangles {
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pts := r.Vertices()
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p1 := pts[0]
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p2 := pts[1]
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p3 := pts[2]
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p4 := pts[3]
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return Triangles{
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Triangle{p1, p2, p3},
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Triangle{p1, p4, p3},
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}
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}
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// Check whether the rectangle contains the point.
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func (r Rectangle) ContainedPoints(pts Points) (Points) {
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return r.MakeTriangles().ContainedPoints(pts)
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}
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// The type describes rectangle that can be drawn.
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type DrawableRectangle struct {
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Rectangle
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ShaderOptions
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// Solid color of the rectangle.
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// Will be ignored if the Shader
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// field is not nil.
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Colority
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}
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func (r *DrawableRectangle) Draw(c *Context) []EVertex {
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return (&DrawableTriangles{
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Colority: r.Colority,
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Triangles: r.MakeTriangles(),
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}).MakeEVertices(c)
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/*// Use the Color as base image if no is provided.
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//var did bool
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if r.Images[0] == nil {
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r.Images[0] = NewImage(1, 1)
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r.Images[0].Set(0, 0, r.Color)
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}
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w, h := r.Images[0].Size()
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// Drawing with shader.
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c.DrawRectShader(w, h, r.Shader, &ebiten.DrawRectShaderOptions{
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GeoM: m,
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Images: r.Images,
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Uniforms: r.Uniforms,
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})*/
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return nil
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}
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