Method viewportChangePos

systemvm/agent/noVNC/core/display.js:92–132

(deltaX, deltaY)

    // ===== PUBLIC METHODS =====

    viewportChangePos(deltaX, deltaY) {
        const vp = this._viewportLoc;
        deltaX = Math.floor(deltaX);
        deltaY = Math.floor(deltaY);

        if (!this._clipViewport) {
            deltaX = -vp.w;  // clamped later of out of bounds
            deltaY = -vp.h;
        }

        const vx2 = vp.x + vp.w - 1;
        const vy2 = vp.y + vp.h - 1;

        // Position change

        if (deltaX < 0 && vp.x + deltaX < 0) {
            deltaX = -vp.x;
        }
        if (vx2 + deltaX >= this._fbWidth) {
            deltaX -= vx2 + deltaX - this._fbWidth + 1;
        }

        if (vp.y + deltaY < 0) {
            deltaY = -vp.y;
        }
        if (vy2 + deltaY >= this._fbHeight) {
            deltaY -= (vy2 + deltaY - this._fbHeight + 1);
        }

        if (deltaX === 0 && deltaY === 0) {
            return;
        }
        Log.Debug("viewportChange deltaX: " + deltaX + ", deltaY: " + deltaY);

        vp.x += deltaX;
        vp.y += deltaY;

        this._damage(vp.x, vp.y, vp.w, vp.h);

        this.flip();
    }

    viewportChangeSize(width, height) {