122 lines
2.3 KiB
Go
122 lines
2.3 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.
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type Rectangle struct {
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// P - position of the rotating center.
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// Scale represent width and height.
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Transform
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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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Color Color
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// Should be draw or not.
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Visible bool
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}
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// Return points of vertices of the rectangle.
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func (r Rectangle) Vertices() Points {
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m := r.Matrix()
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p1 := V(0, 0).Apply(&m)
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p2 := V(1, 0).Apply(&m)
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p3 := V(1, 1).Apply(&m)
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p4 := V(0, 1).Apply(&m)
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return Points{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 LineSegments{
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LineSegment{vs[0], vs[1]},
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LineSegment{vs[1], vs[2]},
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LineSegment{vs[2], vs[3]},
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LineSegment{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) Triangles() 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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//fmt.Println("in:", p1, p2, p3, p4)
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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) ContainsPoint(p Point) bool {
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return r.Triangles().ContainsPoint(p)
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}
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// Check whether the drawable rectangle should be drawn.
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func (r *DrawableRectangle) IsVisible() bool {
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return r.Visible
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}
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func (r *DrawableRectangle) Draw(
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e *Engine,
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i *Image,
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) {
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m := r.Matrix()
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rm := e.Camera().RealMatrix(e)
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m.Concat(rm)
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// Draw solid color if no shader.
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if r.Shader == nil {
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img := NewImage(1, 1)
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img.Set(0, 0, r.Color)
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opts := &ebiten.DrawImageOptions{
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GeoM: m,
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}
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i.DrawImage(img, opts)
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return
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}
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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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//did = true
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}
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w, h := r.Images[0].Size()
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/*if !did {
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t.S.X /= Float(w)
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t.S.Y /= Float(h)
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t.S.X *= r.W
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t.S.Y *= r.H
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}*/
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// Drawing with shader.
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opts := &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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i.DrawRectShader(w, h, r.Shader, opts)
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}
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