grid snap

TODO.MD

@@ -2,12 +2,12 @@
 - Web read/write
 - Ship with default setup
 - Fix -vet errors
-- Snap to grid option
 - Set grid
-- Set animation value
 
 DONE:
 - When there is no matrix it should still draw the rectangle
 - Always show coordinates
 - Web build
 - Escape closes dialogue if on dialogue. Otherwise stops program if on desktop, but not without an unsaved changes warning.
+- Set animation value
+- Snap to grid option

src/animation.odin

@@ -72,10 +72,6 @@ rectangle_corners_move_corner :: proc "contextless" (corners: RectangleCorners,
 	return corners
 }
 
-rectangle_corners_transform_mat2 :: proc "contextless" (corners: RectangleCorners, transform: mat2) -> RectangleCorners {
-	return {corners.tl * transform, corners.tr * transform, corners.br * transform, corners.bl * transform}
-}
-
 draw_animation_rectangle_corners :: proc(corners: RectangleCorners, color: rl.Color) {
 	triangles := rectangle_corners_get_triangles(corners)
 	draw_triangle(triangles[0], {**color.rgb, color.a >> 1})

src/libraries/snths_ui/ui.odin

@@ -66,6 +66,7 @@ ElementType :: enum {
 	ToggleGroup,
 	Label,
 	Divider,
+	Toggle,
 	Custom0, Custom1, Custom2, Custom3, Custom4, Custom5, Custom6, Custom7, Custom8, Custom9,
 }
 

src/main.odin

@@ -10,7 +10,7 @@ WINDOW_CAPTION :: "Transformation Visualizer"
 
 init :: proc() {
 	rl.SetTraceLogLevel(.WARNING)
-	rl.SetConfigFlags({.VSYNC_HINT})
+	rl.SetConfigFlags({.VSYNC_HINT, .WINDOW_RESIZABLE})
 	rl.InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_CAPTION)
 	rl.SetTargetFPS(WINDOW_FRAMERATE)
 	rl.SetExitKey(.KEY_NULL)

src/program.odin

@@ -50,6 +50,7 @@ RAYGUI_ICON_RESET :: "#211#"
 RAYGUI_ICON_TRASH :: "#143#"
 RAYGUI_ICON_DOWN :: "#120#"
 RAYGUI_ICON_UP :: "#121#"
+RAYGUI_ICON_SNAP :: "#136#"
 
 TRANSFORMATION_RECTANGLE_COLOR_ORIGIN :: rl.RED
 TRANSFORMATION_RECTANGLE_COLOR_MIDDLE :: rl.MAGENTA
@@ -87,6 +88,10 @@ UiElementData_TextInput :: struct {
 	str: cstring,
 }
 
+UiElementData_Toggle :: struct {
+	value: ^bool,
+}
+
 UiElementData_ToggleGroup :: struct {
 	value: ^i32,
 }
@@ -290,6 +295,7 @@ Program :: struct {
 	grid_zoom_x_only: bool,
 	grid_zoom_y_only: bool,
 	grid_zoom_speed: f32,
+	grid_snap: bool,
 	font_style: FontStyle,
 	state: ProgramState,
 	message_type: ProgramMessageType,
@@ -300,6 +306,7 @@ Program :: struct {
 	animation_state: ProgramAnimationState,
 	animation_speed: f32,
 	animation_mode: AnimationMode,
+	animation_progress_string: [DIALOG_STATE_TEXT_INPUT_FIELD_COUNT]byte,
 	window_should_close: bool,
 }
 
@@ -609,6 +616,7 @@ program_update :: proc() {
 		animation := &program.animation
 
 		if program.animation_state == .Playing {
+			write_float_to_buffer(program.animation_progress_string[:], animation.matrix_index)
 			animation.matrix_index += 0.01
 		}
 
@@ -934,18 +942,43 @@ program_build_workspace_ui :: proc(ctx: ^ui.Context) -> (elements: []ui.Element,
 		ui.same_line()
 		ui.element(.Slider, slider_dimensions, slider_config, slider_data)
 
+		float_config: ui.ElementConfiguration
+		float_data: ^UiElementData_FloatInput
+		float_dimensions := ui.Dimensions{top_bar_button_width * 2.0, ui.Size_Percentage(1.0)}
+		float_config = {margin = top_bar_element_margin * 2}
+		float_data = new(UiElementData_FloatInput, context.temp_allocator)
+		float_data^ = {
+			value = &program.animation.matrix_index,
+			value_string = transmute(cstring)&program.animation_progress_string,
+		}
+		ui.same_line()
+		ui.element(.InputFloat, float_dimensions, float_config, float_data)
+
 		toggle_group_config: ui.ElementConfiguration
 		toggle_group_dimensions := ui.Dimensions{top_bar_button_width * 3.0, ui.Size_Percentage(1.0)}
 		toggle_group_data: ^UiElementData_ToggleGroup
 
 		toggle_group_config = {
-			margin = button_margin,
+			margin = top_bar_element_margin * 2,
 			label = enum_to_raygui_options_string(AnimationMode, context.temp_allocator),
 			tooltip = "Play animation\nstep by step;Play animation using the\nfull transformation matrix"}
 		toggle_group_data = new(UiElementData_ToggleGroup, context.temp_allocator)
 		toggle_group_data^ = {value = cast(^i32)&program.animation_mode}
 		ui.same_line()
 		ui.element(.ToggleGroup, toggle_group_dimensions, toggle_group_config, toggle_group_data)
+
+		ui.same_line()
+		ui.element(.Divider, divider_dimensions, divider_config)
+
+		toggle_config: ui.ElementConfiguration
+		toggle_dimensions := ui.Dimensions{top_bar_button_width, ui.Size_Percentage(1.0)}
+		toggle_data: ^UiElementData_Toggle
+
+		toggle_config = {margin = top_bar_element_margin, label = RAYGUI_ICON_SNAP, tooltip = "Snap to grid"}
+		toggle_data = new(UiElementData_Toggle, context.temp_allocator)
+		toggle_data^ = {value = &program.grid_snap}
+		ui.same_line()
+		ui.element(.Toggle, toggle_dimensions, toggle_config, toggle_data)
 	}
 	ui.container_end()
 
@@ -1021,16 +1054,31 @@ program_handle_mouse :: proc(mouse_state: MouseState, top_bar_container, matrix_
 			break state_label
 		}
 		draggable := program.mouse_current_draggable
+		position := matrix3_transform_xy(world_to_grid_matrix, mouse)
+		drag_to_position := matrix3_transform_xy(world_to_grid_matrix, mouse)
+		if program.grid_snap {
+			grid_line_sep := grid_get_line_separation(program.grid.zoom, program.grid.cell_size_px)
+			drag_to_position = linalg.floor(drag_to_position / grid_line_sep) * grid_line_sep
+		}
+
 		switch draggable in draggable {
 		case MouseDraggable_Point:
-			draggable.ref^ = matrix3_transform_xy(world_to_grid_matrix, mouse)
+			draggable.ref^ = drag_to_position
 		case MouseDraggable_RectangleCornerData:
-			position := matrix3_transform_xy(world_to_grid_matrix, mouse)
-			corners := rectangle_corners_move_corner(draggable.corners_ref^, position, draggable.corner)
+			corners := rectangle_corners_move_corner(draggable.corners_ref^, drag_to_position, draggable.corner)
 			draggable.corners_ref^ = corners
 		case MouseDraggable_RectangleData:
-			mouse_delta_grid := rl.GetMouseDelta() * grid_get_zoom(program.grid.zoom)
-			draggable.corners^ = rectangle_corners_add(draggable.corners^, mouse_delta_grid)
+			if program.grid_snap {
+
+				prev_tl := draggable.corners.tl
+				draggable.corners.tl = drag_to_position
+				draggable.corners.tr += draggable.corners.tl - prev_tl
+				draggable.corners.br += draggable.corners.tl - prev_tl
+				draggable.corners.bl += draggable.corners.tl - prev_tl
+			} else {
+				mouse_delta_grid := rl.GetMouseDelta() * grid_get_zoom(program.grid.zoom)
+				draggable.corners^ = rectangle_corners_add(draggable.corners^, mouse_delta_grid)
+			}
 		}
 	case .DraggingGrid:
 		program.grid.offset -= rl.GetMouseDelta() * grid_get_zoom(program.grid.zoom)
@@ -1244,6 +1292,14 @@ program_render_ui_and_handle_focus :: proc(ctx: ^ui.Context, focus_element_id: u
 				tooltip_text = strings.clone_to_cstring(tooltips_split[tooltip_index], context.temp_allocator)
 				tooltip_position = mouse
 			}
+		case .Toggle:
+			data := cast(^UiElementData_Toggle)element.data
+			rl.GuiToggle(area, element.label, data.value)
+			mouse := rl.GetMousePosition()
+			if rect_has_point(area, mouse) {
+				tooltip_text = element.tooltip
+				tooltip_position = mouse
+			}
 		case:
 			rl.DrawRectangleRec(area, rl.MAGENTA)
 		}