52 lines
1.9 KiB
Zig
52 lines
1.9 KiB
Zig
const basic_models = @import("../models/basic_models.zig");
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const Point2_f = basic_models.Point2_f;
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const Canvas = @import("../Canvas.zig");
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const Document = @import("../models/Document.zig");
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const pipeline = @import("../render/cpu/pipeline.zig");
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const Transform = pipeline.Transform;
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pub const ToolContext = struct {
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canvas: *Canvas,
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document_point: Point2_f,
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selected_object_id: ?u64,
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pub fn addObject(self: *const ToolContext, template: Document.Object) !void {
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var obj = template;
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const local_pos = self.computeLocalPosition();
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try obj.setProperty(self.canvas.document.allocator, .{ .data = .{ .position = local_pos } });
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try self.canvas.document.addObjectUnderParentId(self.selected_object_id, obj);
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self.canvas.requestRedraw();
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}
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fn computeLocalPosition(self: *const ToolContext) Point2_f {
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if (self.selected_object_id) |parent_id| {
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if (findWorldTransformById(self.canvas.document, parent_id)) |parent_world| {
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return pipeline.worldToLocalTransform(parent_world, self.document_point.x, self.document_point.y);
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}
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}
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return self.document_point;
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}
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};
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fn findWorldTransformById(doc: *Document, target_id: u64) ?Transform {
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const identity = Transform{};
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for (doc.objects.items) |*obj| {
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if (findWorldTransformInTree(obj, identity, target_id)) |t| return t;
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}
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return null;
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}
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fn findWorldTransformInTree(obj: *const Document.Object, parent: Transform, target_id: u64) ?Transform {
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const local = Transform.init(obj);
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const world = Transform.compose(parent, local);
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if (obj.id == target_id) return world;
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for (obj.children.items) |*child| {
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if (findWorldTransformInTree(child, world, target_id)) |t| return t;
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}
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return null;
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}
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pub const Tool = struct {
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onCanvasClick: *const fn (*const ToolContext) anyerror!void,
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};
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