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import type { StaticCanvasAppState, AppState } from "../types";
import type { StaticCanvasRenderConfig } from "../scene/types";
import { THEME, THEME_FILTER } from "../constants";
export const fillCircle = (
context: CanvasRenderingContext2D,
cx: number,
cy: number,
radius: number,
stroke = true,
) => {
context.beginPath();
context.arc(cx, cy, radius, 0, Math.PI * 2);
context.fill();
if (stroke) {
context.stroke();
}
};
export const getNormalizedCanvasDimensions = (
canvas: HTMLCanvasElement,
scale: number,
): [number, number] => {
// When doing calculations based on canvas width we should used normalized one
return [canvas.width / scale, canvas.height / scale];
};
export const bootstrapCanvas = ({
canvas,
scale,
normalizedWidth,
normalizedHeight,
theme,
isExporting,
viewBackgroundColor,
}: {
canvas: HTMLCanvasElement;
scale: number;
normalizedWidth: number;
normalizedHeight: number;
theme?: AppState["theme"];
isExporting?: StaticCanvasRenderConfig["isExporting"];
viewBackgroundColor?: StaticCanvasAppState["viewBackgroundColor"];
}): CanvasRenderingContext2D => {
const context = canvas.getContext("2d")!;
context.setTransform(1, 0, 0, 1, 0, 0);
context.scale(scale, scale);
if (isExporting && theme === THEME.DARK) {
context.filter = THEME_FILTER;
}
// Paint background
if (typeof viewBackgroundColor === "string") {
const hasTransparence =
viewBackgroundColor === "transparent" ||
viewBackgroundColor.length === 5 || // #RGBA
viewBackgroundColor.length === 9 || // #RRGGBBA
/(hsla|rgba)\(/.test(viewBackgroundColor);
if (hasTransparence) {
context.clearRect(0, 0, normalizedWidth, normalizedHeight);
}
context.save();
context.fillStyle = viewBackgroundColor;
context.fillRect(0, 0, normalizedWidth, normalizedHeight);
context.restore();
} else {
context.clearRect(0, 0, normalizedWidth, normalizedHeight);
}
return context;
};
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