52 lines
1.8 KiB
Odin
52 lines
1.8 KiB
Odin
package main
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import "core:math/linalg"
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import rl "libraries/raylib"
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Grid :: struct {
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cell_size: v2,
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zoom_previous, zoom: v2,
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world_position, world_size, offset: v2,
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}
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grid_world_to_grid_matrix :: proc(zoom, offset: v2) -> mat3 {
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zoom_amount := linalg.pow(v2{2.0, 2.0}, zoom) - 1.0
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return (
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mat3 {
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1, 0, 0,
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0, 1, 0,
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offset.x, offset.y, 1,
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} *
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linalg.matrix3_scale(v3{**zoom_amount, 1.0}))
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}
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draw_grid :: proc(grid: Grid, text_draw, text_clip: rect2) {
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world_to_grid_matrix := grid_world_to_grid_matrix(grid.zoom, grid.offset)
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grid_to_world_matrix := linalg.inverse(world_to_grid_matrix)
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grid_world_br := grid.world_position + grid.world_size
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grid_color := rl.Color{64, 64, 64, 255}
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grid_tl := (v3{**grid.world_position, 1.0} * world_to_grid_matrix).xy
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grid_tl = linalg.floor(grid_tl / grid.cell_size) * grid.cell_size
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grid_br := (v3{**grid_world_br, 1.0} * world_to_grid_matrix).xy
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for x: f32 = grid_tl.x; x < grid_br.x; x += grid.cell_size.x {
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world_position_x := (v3{x, 0.0, 1.0} * grid_to_world_matrix).x
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p1 := v2{world_position_x, grid.world_position.y}
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p2 := v2{world_position_x, grid_world_br.y}
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rl.DrawLineV(p1, p2, grid_color)
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if p1.x >= text_clip.x && p1.x < text_clip.x + text_clip.width {
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draw_float_aligned(x, {world_position_x, text_draw.y}, program.font_style, .Middle, .Top, rl.GRAY)
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}
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}
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for y: f32 = grid_tl.y; y < grid_br.y; y += grid.cell_size.y {
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world_position_y := (v3{0.0, y, 1.0} * grid_to_world_matrix).y
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p1 := v2{grid.world_position.x, world_position_y}
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p2 := v2{grid_world_br.x, world_position_y}
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rl.DrawLineV(p1, p2, grid_color)
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if p1.y >= text_clip.y && p1.y < text_clip.y + text_clip.height {
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draw_float_aligned(y, {text_draw.x, world_position_y}, program.font_style, .Left, .Center, rl.GRAY)
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}
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}
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}
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