Grid values

grid.odin

@@ -0,0 +1,48 @@
+package main
+
+import "core:math/linalg"
+import rl "libraries/raylib"
+
+Grid :: struct {
+	cell_size: v2,
+	zoom_previous, zoom: v2,
+	world_position, world_size, offset: v2,
+}
+
+draw_grid :: proc(grid: Grid, text_draw, text_clip: rect2) {
+	zoom_amount := grid_get_zoom_amount(grid.zoom)
+	world_to_grid_matrix := (
+		mat3 {
+			1, 0, 0,
+			0, 1, 0,
+			grid.offset.x, grid.offset.y, 1,
+		} *
+		linalg.matrix3_scale(v3{**zoom_amount, 1.0}))
+	grid_to_world_matrix := linalg.inverse(world_to_grid_matrix)
+	grid_world_br := grid.world_position + grid.world_size
+	grid_color := rl.Color{64, 64, 64, 255}
+
+	grid_tl := (v3{**grid.world_position, 1.0} * world_to_grid_matrix).xy
+	grid_tl = linalg.floor(grid_tl / grid.cell_size) * grid.cell_size
+	grid_br := (v3{**grid_world_br, 1.0} * world_to_grid_matrix).xy
+
+	for x: f32 = grid_tl.x; x < grid_br.x; x += grid.cell_size.x {
+		world_position_x := (v3{x, 0.0, 1.0} * grid_to_world_matrix).x
+		p1 := v2{world_position_x, grid.world_position.y}
+		p2 := v2{world_position_x, grid_world_br.y}
+		rl.DrawLineV(p1, p2, grid_color)
+		if p1.x >= text_clip.x && p1.x < text_clip.x + text_clip.width {
+			draw_float_aligned(x, {world_position_x, text_draw.y}, program.font_style, .Middle, .Top, rl.GRAY)
+		}
+	}
+
+	for y: f32 = grid_tl.y; y < grid_br.y; y += grid.cell_size.y {
+		world_position_y := (v3{0.0, y, 1.0} * grid_to_world_matrix).y
+		p1 := v2{grid.world_position.x, world_position_y}
+		p2 := v2{grid_world_br.x, world_position_y}
+		rl.DrawLineV(p1, p2, grid_color)
+		if p1.y >= text_clip.y && p1.y < text_clip.y + text_clip.height {
+			draw_float_aligned(y, {text_draw.x, world_position_y}, program.font_style, .Left, .Center, rl.GRAY)
+		}
+	}
+}

program.odin

@@ -218,12 +218,6 @@ AnimationState :: enum {
 	Finished,
 }
 
-Grid :: struct {
-	cell_size: v2,
-	zoom_previous, zoom: v2,
-	world_position, world_size, offset: v2,
-}
-
 float_slice_get_mat3 :: proc(floats: []f32, index: int) -> ^mat3 {
 	return cast(^mat3)(&floats[index * 9])
 }
@@ -278,7 +272,7 @@ program_init :: proc(allocator := context.allocator) {
 	program.font_style = {
 		font = rl.GetFontDefault(),
 		size = 16.0,
-		spacing = 1.0
+		spacing = 2.0
 	}
 	program.grid = {
 		cell_size = 32.0,
@@ -415,33 +409,10 @@ program_update :: proc() {
 		}
 	}
 
-	grid := program.grid
-	zoom_amount := grid_get_zoom_amount(grid.zoom)
-	world_to_grid_matrix := (
-		mat3 {
-			1, 0, 0,
-			0, 1, 0,
-			grid.offset.x, grid.offset.y, 1,
-		} *
-		linalg.matrix3_scale(v3{**zoom_amount, 1.0}))
-	grid_to_world_matrix := linalg.inverse(world_to_grid_matrix)
-	grid_world_br := grid.world_position + grid.world_size
-
-	grid_tl := (v3{**grid.world_position, 1.0} * world_to_grid_matrix).xy
-	grid_tl = linalg.floor(grid_tl / grid.cell_size) * grid.cell_size
-	grid_br := (v3{**grid_world_br, 1.0} * world_to_grid_matrix).xy
-	for x: f32 = grid_tl.x; x < grid_br.x; x += grid.cell_size.x {
-		world_position := (v3{x, 0.0, 1.0} * grid_to_world_matrix).x
-		p1 := v2{world_position, grid.world_position.y}
-		p2 := v2{world_position, grid_world_br.y}
-		rl.DrawLineV(p1, p2, {255, 255, 255, 128})
-	}
-	for y: f32 = grid_tl.y; y < grid_br.y; y += grid.cell_size.y {
-		world_position := (v3{0.0, y, 1.0} * grid_to_world_matrix).y
-		p1 := v2{grid.world_position.x, world_position}
-		p2 := v2{grid_world_br.x, world_position}
-		rl.DrawLineV(p1, p2, {255, 255, 255, 128})
-	}
+	top_bar_container_br := rect_get_br(rect2(top_bar_container.area))
+	matrix_container_br := rect_get_br(rect2(matrix_container.area))
+	grid_text_clip := rect_from_area(v2{matrix_container_br.x, top_bar_container_br.y}, v2{WINDOW_WIDTH, WINDOW_HEIGHT})
+	draw_grid(program.grid, rect_grow(grid_text_clip, -4.0), rect_grow(grid_text_clip, -32.0))
 
 	if program.animation_state == .Playing {
 		program.animation_matrix_progress += program.animation_speed * delta_time_fraction()

utils.odin

@@ -30,16 +30,6 @@ draw_text :: proc(text: cstring, position: v2, style: FontStyle, color: rl.Color
 	rl.DrawTextEx(style.font, text, position, style.size, style.spacing, color)
 }
 
-draw_grid :: proc(area: rect2, line_interval: v2, color: rl.Color) {
-	br := rect_get_br(area)
-	for x := area.x; x < br.x; x += line_interval.x {
-		rl.DrawLineV({x, area.y}, {x, br.y}, color)
-	}
-	for y := area.y; y < br.y; y += line_interval.y {
-		rl.DrawLineV({area.x, y}, {br.x, y}, color)
-	}
-}
-
 TextHalign :: enum {
 	Left,
 	Middle,
@@ -68,6 +58,19 @@ draw_text_aligned :: proc(text: cstring, position: v2, style: FontStyle, halign:
 	draw_text(text, position, style, color)
 }
 
+draw_float_aligned :: proc(value: f32, position: v2, style: FontStyle, halign: TextHalign, valign: TextValign, color: rl.Color) {
+	fractional := fract(value)
+	text: cstring
+	if fractional == 0.0 {
+		text = fmt.ctprintf("%.0f", value)
+	} else if fractional * 10.0 > 1.0 {
+		text = fmt.ctprintf("%.1f", value)
+	} else {
+		text = fmt.ctprintf("%.2f", value)
+	}
+	draw_text_aligned(text, position, style, halign, valign, color)
+}
+
 /// ### MATH ### ///
 fract :: proc(val: f32) -> f32 {
 	return val - math.trunc(val)