mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-21 05:42:18 +02:00
120 lines
3.7 KiB
Go
120 lines
3.7 KiB
Go
// Copyright 2013 Hajime Hoshi
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package rects
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import (
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"github.com/hajimehoshi/go.ebiten"
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"github.com/hajimehoshi/go.ebiten/graphics"
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"github.com/hajimehoshi/go.ebiten/graphics/matrix"
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"image/color"
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"math"
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"math/rand"
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"time"
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)
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type Rects struct {
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rectTexture graphics.Texture
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rectTextureInited bool
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offscreen graphics.Texture
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offscreenInited bool
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rectBounds *graphics.Rect
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rectColor *color.RGBA
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}
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func New() *Rects {
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return &Rects{
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rectTextureInited: false,
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offscreenInited: false,
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rectBounds: &graphics.Rect{},
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rectColor: &color.RGBA{},
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}
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}
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func (game *Rects) Init(tf graphics.TextureFactory) {
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game.rectTexture = tf.NewTexture(16, 16)
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game.offscreen = tf.NewTexture(256, 240)
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}
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func (game *Rects) Update(context ebiten.GameContext) {
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game.rectBounds.X = rand.Intn(context.ScreenWidth())
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game.rectBounds.Y = rand.Intn(context.ScreenHeight())
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game.rectBounds.Width =
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rand.Intn(context.ScreenWidth() - game.rectBounds.X)
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game.rectBounds.Height =
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rand.Intn(context.ScreenHeight() - game.rectBounds.Y)
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game.rectColor.R = uint8(rand.Intn(256))
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game.rectColor.G = uint8(rand.Intn(256))
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game.rectColor.B = uint8(rand.Intn(256))
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game.rectColor.A = uint8(rand.Intn(256))
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}
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func (game *Rects) rectGeometryMatrix() matrix.Geometry {
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geometryMatrix := matrix.IdentityGeometry()
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scaleX := float64(game.rectBounds.Width) /
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float64(game.rectTexture.Width())
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scaleY := float64(game.rectBounds.Height) /
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float64(game.rectTexture.Height())
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geometryMatrix.Scale(scaleX, scaleY)
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geometryMatrix.Translate(
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float64(game.rectBounds.X), float64(game.rectBounds.Y))
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return geometryMatrix
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}
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func (game *Rects) rectColorMatrix() matrix.Color {
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colorMatrix := matrix.IdentityColor()
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colorMatrix.Elements[0][0] =
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float64(game.rectColor.R) / float64(math.MaxUint8)
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colorMatrix.Elements[1][1] =
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float64(game.rectColor.G) / float64(math.MaxUint8)
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colorMatrix.Elements[2][2] =
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float64(game.rectColor.B) / float64(math.MaxUint8)
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colorMatrix.Elements[3][3] =
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float64(game.rectColor.A) / float64(math.MaxUint8)
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return colorMatrix
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}
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func (game *Rects) Draw(g graphics.Context) {
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if !game.rectTextureInited {
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g.SetOffscreen(game.rectTexture.ID())
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g.Fill(&color.White)
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game.rectTextureInited = true
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}
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g.SetOffscreen(game.offscreen.ID())
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if !game.offscreenInited {
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g.Fill(&color.RGBA{0, 0, 0, 255})
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game.offscreenInited = true
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}
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g.DrawTexture(game.rectTexture.ID(),
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game.rectGeometryMatrix(),
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game.rectColorMatrix())
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g.SetOffscreen(g.Screen().ID())
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g.DrawTexture(game.offscreen.ID(),
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matrix.IdentityGeometry(),
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matrix.IdentityColor())
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}
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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