57 lines
2.2 KiB
Zig
57 lines
2.2 KiB
Zig
const std = @import("std");
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const Document = @import("../../models/Document.zig");
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const pipeline = @import("pipeline.zig");
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const line = @import("line.zig");
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const DrawContext = pipeline.DrawContext;
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const Color = @import("dvui").Color;
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const Object = Document.Object;
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const default_stroke: Color.PMA = .{ .r = 0, .g = 0, .b = 0, .a = 255 };
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const default_fill: Color.PMA = .{ .r = 0, .g = 0, .b = 0, .a = 0 };
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const default_thickness: f32 = 2.0;
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/// Ломаная по точкам, обводка stroke_rgba. При closed — отрезок последняя–первая точка и заливка fill_rgba.
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pub fn draw(
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ctx: *DrawContext,
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obj: *const Object,
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allocator: std.mem.Allocator,
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) !void {
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const p_prop = obj.getProperty(.points) orelse return;
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const pts = p_prop.points;
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if (pts.len < 2) return;
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const stroke = if (obj.getProperty(.stroke_rgba)) |s| pipeline.rgbaToPma(s.stroke_rgba) else default_stroke;
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const thickness = if (obj.getProperty(.thickness)) |t| t.thickness else default_thickness;
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const closed = if (obj.getProperty(.closed)) |c| c.closed else false;
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const filled = if (obj.getProperty(.filled)) |f| f.filled else true;
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const fill_color = if (obj.getProperty(.fill_rgba)) |f| pipeline.rgbaToPma(f.fill_rgba) else default_fill;
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const buffer = try allocator.alloc(Color.PMA, ctx.buf_width * ctx.buf_height);
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@memset(buffer, .{ .r = 0, .g = 0, .b = 0, .a = 0 });
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defer allocator.free(buffer);
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var copy_ctx = ctx.*;
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copy_ctx.pixels = buffer;
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copy_ctx.replace_mode = true;
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const do_fill = closed and filled;
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if (do_fill) {
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copy_ctx.startFill(allocator) catch return;
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}
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var i: usize = 0;
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while (i + 1 < pts.len) : (i += 1) {
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line.drawLine(©_ctx, pts[i].x, pts[i].y, pts[i + 1].x, pts[i + 1].y, stroke, thickness, true);
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}
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if (closed and pts.len >= 2) {
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const last = pts.len - 1;
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line.drawLine(©_ctx, pts[last].x, pts[last].y, pts[0].x, pts[0].y, stroke, thickness, true);
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}
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if (do_fill) {
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copy_ctx.stopFill(allocator, fill_color);
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}
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ctx.compositeDrawerContext(©_ctx, copy_ctx.transform.opacity);
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}
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