Initial project import

tools/v/examples/gg/additive.v

@@ -0,0 +1,124 @@
+module main
+
+import os
+import gg
+import math
+
+@[heap]
+pub struct Window {
+pub mut:
+	ctx   &gg.Context = unsafe { 0 }
+	image gg.Image
+}
+
+pub fn (mut window Window) init() {
+	logo_path := os.join_path(@VEXEROOT, 'examples/assets/logo.png')
+	window.image = window.ctx.create_image(logo_path) or { panic(err) }
+}
+
+pub fn (mut window Window) draw(_ voidptr) {
+	window.ctx.begin()
+
+	myconfig := gg.DrawImageConfig{
+		img:      &window.image
+		img_id:   window.image.id
+		img_rect: gg.Rect{
+			x:      400 - window.image.width / 2
+			y:      300 - window.image.height / 2
+			width:  window.image.width
+			height: window.image.height
+		}
+		rotation: f32(window.ctx.frame)
+		// effect: .alpha <-- this can be omitted completely as it is alpha by default.
+	}
+	window.ctx.draw_image_with_config(gg.DrawImageConfig{ ...myconfig, flip_x: true })
+
+	// Red
+	window.ctx.draw_image_with_config(gg.DrawImageConfig{
+		...myconfig
+		img_rect: gg.Rect{
+			...myconfig.img_rect
+			x: myconfig.img_rect.x + f32(math.sin(f32(window.ctx.frame) / 10.0) * 60)
+			y: myconfig.img_rect.y + f32(math.cos(f32(window.ctx.frame) / 10.0) * 60)
+		}
+		color:    gg.Color{255, 0, 0, 255}
+		effect:   .add
+	})
+
+	// Green
+	window.ctx.draw_image_with_config(gg.DrawImageConfig{
+		...myconfig
+		img_rect: gg.Rect{
+			...myconfig.img_rect
+			x: myconfig.img_rect.x + f32(math.sin(f32(window.ctx.frame) / 10.0) * 80)
+			y: myconfig.img_rect.y + f32(math.cos(f32(window.ctx.frame) / 10.0) * 80)
+		}
+		color:    gg.Color{0, 255, 0, 255}
+		effect:   .add
+	})
+
+	// Blue
+	window.ctx.draw_image_with_config(gg.DrawImageConfig{
+		...myconfig
+		img_rect: gg.Rect{
+			...myconfig.img_rect
+			x: myconfig.img_rect.x + f32(math.sin(f32(window.ctx.frame) / 10.0) * 100)
+			y: myconfig.img_rect.y + f32(math.cos(f32(window.ctx.frame) / 10.0) * 100)
+		}
+		color:    gg.Color{0, 0, 255, 255}
+		effect:   .add
+	})
+
+	// More examples
+	window.ctx.draw_image_with_config(gg.DrawImageConfig{
+		...myconfig
+		img_rect: gg.Rect{
+			...myconfig.img_rect
+			x: 50
+			y: 0
+		}
+		color:    gg.Color{255, 0, 0, 255}
+		effect:   .add
+	})
+
+	window.ctx.draw_image_with_config(gg.DrawImageConfig{
+		...myconfig
+		img_rect: gg.Rect{
+			...myconfig.img_rect
+			x: 50
+			y: 50
+		}
+		color:    gg.Color{0, 255, 0, 255}
+		effect:   .add
+	})
+
+	window.ctx.draw_image_with_config(gg.DrawImageConfig{
+		...myconfig
+		img_rect: gg.Rect{
+			...myconfig.img_rect
+			x: 50
+			y: 100
+		}
+		color:    gg.Color{0, 0, 255, 255}
+		effect:   .add
+	})
+
+	window.ctx.end()
+}
+
+fn main() {
+	mut window := &Window{}
+
+	window.ctx = gg.new_context(
+		window_title: 'Additive colors & image rotation'
+		width:        800
+		height:       600
+		user_data:    window
+		bg_color:     gg.gray
+		// FNs
+		init_fn:  window.init
+		frame_fn: window.draw
+	)
+
+	window.ctx.run()
+}