Method initCanvas

packages/fairygui/src/text/DynamicFont.ts:208–218

* Initialize canvas state * 初始化画布状态

()

     * 初始化画布状态
     */
    private initCanvas(): void {
        const ctx = this._ctx;

        // Clear to transparent
        ctx.clearRect(0, 0, this._atlasWidth, this._atlasHeight);

        // Set font
        ctx.font = `${this._fontSize}px "${this._fontFamily}"`;
        ctx.textBaseline = 'top';
        ctx.fillStyle = 'white';
    }

    /**
     * Measure font metrics