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106 lines
3.2 KiB
V
106 lines
3.2 KiB
V
// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
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module gg
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import gx
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// DrawImageConfig struct defines the various options
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// that can be used to draw an image onto the screen
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pub struct DrawImageConfig {
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pub:
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flip_x bool
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flip_y bool
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img &Image = unsafe { nil }
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img_id int
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img_rect Rect // defines the size and position on image when rendering to the screen
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part_rect Rect // defines the size and position of part of the image to use when rendering
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rotate int // amount to rotate the image in degrees
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z f32
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color gx.Color = gx.white
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effect ImageEffect = .alpha
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}
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pub enum ImageEffect {
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// TODO(FireRedz): Add more effects
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alpha
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add
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}
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// Rect represents a rectangular shape in `gg`.
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pub struct Rect {
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pub:
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x f32
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y f32
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width f32
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height f32
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}
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// cache_image caches the image `img` in memory for later reuse.
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// cache_image returns the cache index of the cached image.
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//
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// See also: get_cached_image_by_idx
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// See also: remove_cached_image_by_idx
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pub fn (mut ctx Context) cache_image(img Image) int {
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ctx.image_cache << img
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image_idx := ctx.image_cache.len - 1
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ctx.image_cache[image_idx].id = image_idx
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return image_idx
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}
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// get_cached_image_by_idx returns a cached `Image` identified by `image_idx`.
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//
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// See also: cache_image
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// See also: remove_cached_image_by_idx
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pub fn (mut ctx Context) get_cached_image_by_idx(image_idx int) &Image {
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return &ctx.image_cache[image_idx]
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}
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// remove_cached_image_by_idx removes an `Image` identified by `image_idx` from the
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// image cache.
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//
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// See also: cache_image
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// See also: get_cached_image_by_idx
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pub fn (mut ctx Context) remove_cached_image_by_idx(image_idx int) {
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ctx.image_cache.delete(image_idx)
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}
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// Draw part of an image using uv coordinates
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// img_rect is the size and position (in pixels on screen) of the displayed rectangle (ie the draw_image args)
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// part_rect is the size and position (in absolute pixels in the image) of the wanted part
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// eg. On a 600*600 context, to display only the first 400*400 pixels of a 2000*2000 image
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// on the entire context surface, call :
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// draw_image_part(Rect{0, 0, 600, 600}, Rect{0, 0, 400, 400}, img)
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pub fn (ctx &Context) draw_image_part(img_rect Rect, part_rect Rect, img_ &Image) {
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ctx.draw_image_with_config(
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img: img_
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img_rect: img_rect
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part_rect: part_rect
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)
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}
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// draw_image_flipped draws the provided image flipped horizontally (use `draw_image_with_config` to flip vertically)
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pub fn (ctx &Context) draw_image_flipped(x f32, y f32, width f32, height f32, img_ &Image) {
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ctx.draw_image_with_config(
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flip_x: true
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img: img_
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img_rect: Rect{x, y, width, height}
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)
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}
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// draw_image_by_id draws an image by its id
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pub fn (ctx &Context) draw_image_by_id(x f32, y f32, width f32, height f32, id int) {
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ctx.draw_image_with_config(
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img_id: id
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img_rect: Rect{x, y, width, height}
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)
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}
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// draw_image_3d draws an image with a z depth
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pub fn (ctx &Context) draw_image_3d(x f32, y f32, z f32, width f32, height f32, img_ &Image) {
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ctx.draw_image_with_config(
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img: img_
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img_rect: Rect{x, y, width, height}
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z: z
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)
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}
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