59 lines
1.1 KiB
Odin
59 lines
1.1 KiB
Odin
package showimage
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import "core:os"
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import "core:strings"
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import rl "vendor:raylib"
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tex: ^rl.Texture
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zoom: f32 = 1
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offset: [2]f32
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main :: proc() {
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rl.InitWindow(800, 600, "showimage")
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rl.SetWindowState({ .WINDOW_RESIZABLE })
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rl.SetTargetFPS(60)
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if len(os.args) > 1 {
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path := strings.clone_to_cstring(os.args[1])
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tex = new_clone(rl.LoadTexture(path))
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reset_zoom()
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}
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for !rl.WindowShouldClose() {
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scroll := rl.GetMouseWheelMove()
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if scroll > 0 {
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zoom *= 2
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} else if scroll < 0 {
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zoom /= 2
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}
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if rl.IsMouseButtonDown(rl.MouseButton.LEFT) {
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offset += rl.GetMouseDelta()
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}
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if rl.IsMouseButtonPressed(rl.MouseButton.RIGHT) {
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offset = 0
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reset_zoom()
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}
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rl.BeginDrawing()
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rl.ClearBackground({50, 50, 50, 255})
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if tex != nil {
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rl.DrawTextureEx(tex^, offset, 0, zoom, rl.WHITE)
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}
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rl.EndDrawing()
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}
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rl.CloseWindow()
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}
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zoom_to_power :: proc(size: i32, max: i32) -> i32 {
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fit: i32 = 1
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for fit * size < max {
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fit *= 2
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}
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return fit / 2
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}
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reset_zoom :: proc() {
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zoom = f32(min(
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zoom_to_power(tex.width, rl.GetRenderWidth()),
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zoom_to_power(tex.height, rl.GetRenderHeight()),
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))
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}
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